skybison / ext / Objects / unicodeobject-test.cpp

// Copyright (c) Facebook, Inc. and its affiliates. (http://www.facebook.com)
#include <cstring>

#include "Python.h"
#include "gtest/gtest.h"

#include "capi-fixture.h"
#include "capi-testing.h"

extern "C" int _Py_EncodeUTF8Ex(const wchar_t*, char**, size_t*, const char**,
                                int, _Py_error_handler);
extern "C" wchar_t* _Py_DecodeUTF8_surrogateescape(const char*, Py_ssize_t,
                                                   size_t*);
extern "C" int _Py_DecodeUTF8Ex(const char*, Py_ssize_t, wchar_t**, size_t*,
                                const char**, _Py_error_handler);
extern "C" int _Py_normalize_encoding(const char*, char*, size_t);

namespace py {
namespace testing {

using UnicodeExtensionApiTest = ExtensionApi;

TEST_F(UnicodeExtensionApiTest, AsEncodedStringFromNonStringReturnsNull) {
  EXPECT_EQ(PyUnicode_AsEncodedString(Py_None, nullptr, nullptr), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, AsEncodedStringWithNullSizeReturnsUTF8) {
  const char* str = "utf-8 \xc3\xa8";
  PyObjectPtr pyunicode(PyUnicode_FromString(str));

  PyObjectPtr bytes(PyUnicode_AsEncodedString(pyunicode, nullptr, nullptr));
  EXPECT_TRUE(isBytesEqualsCStr(bytes, str));
}

TEST_F(UnicodeExtensionApiTest, AsEncodedStringASCIIUsesErrorHandler) {
  PyObjectPtr pyunicode(PyUnicode_FromString("non\xc3\xa8-ascii"));

  PyObjectPtr bytes(PyUnicode_AsEncodedString(pyunicode, "ascii", "ignore"));
  EXPECT_TRUE(isBytesEqualsCStr(bytes, "non-ascii"));
}

TEST_F(UnicodeExtensionApiTest, AsEncodedStringLatin1ReturnsLatin1) {
  PyObjectPtr pyunicode(PyUnicode_FromString("latin-1 \xc3\xa8"));

  PyObjectPtr bytes(PyUnicode_AsEncodedString(pyunicode, "latin-1", nullptr));
  EXPECT_TRUE(isBytesEqualsCStr(bytes, "latin-1 \xe8"));
}

TEST_F(UnicodeExtensionApiTest, AsEncodedStringASCIIWithSubClassReturnsASCII) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("some string")
)");
  PyObjectPtr substr(mainModuleGet("substr"));
  const char* expected = "some string";

  PyObjectPtr bytes(PyUnicode_AsEncodedString(substr, "ascii", nullptr));
  EXPECT_TRUE(isBytesEqualsCStr(bytes, expected));
}

TEST_F(UnicodeExtensionApiTest,
       AsEncodedStringWithBytearrayReturnRaisesWarning) {
  CaptureStdStreams streams;
  PyRun_SimpleString(R"(
import _codecs

def encoder(s):
    return bytearray(b"expected"), "two"

def lookup_function(encoding):
    if encoding == "encode-with-bytearray-return":
        return encoder, 0, 0, 0

_codecs.register(lookup_function)
substr = "some test"
)");
  PyObjectPtr substr(mainModuleGet("substr"));
  PyObjectPtr bytes(PyUnicode_AsEncodedString(
      substr, "encode-with-bytearray-return", nullptr));
  EXPECT_TRUE(isBytesEqualsCStr(bytes, "expected"));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_NE(streams.err().find(
                "RuntimeWarning: encoder encode-with-bytearray-return "
                "returned bytearray instead of bytes; use codecs.encode() to "
                "encode to arbitrary types\n"),
            std::string::npos);
}

TEST_F(UnicodeExtensionApiTest,
       AsEncodedStringWithNonBytelikeReturnRaisesError) {
  PyRun_SimpleString(R"(
import _codecs

def encoder(s):
    return "not-byteslike", "two"

def lookup_function(encoding):
    if encoding == "encode-with-non-bytelike-return":
        return encoder, 0, 0, 0

_codecs.register(lookup_function)
substr = "some test"
)");
  PyObjectPtr substr(mainModuleGet("substr"));
  EXPECT_EQ(PyUnicode_AsEncodedString(substr, "encode-with-non-bytelike-return",
                                      nullptr),
            nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, AsUTF8FromNonStringReturnsNull) {
  // Pass a non string object
  const char* cstring = PyUnicode_AsUTF8AndSize(Py_None, nullptr);
  EXPECT_EQ(nullptr, cstring);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8WithNullSizeReturnsCString) {
  const char* str = "Some C String";
  PyObjectPtr pyunicode(PyUnicode_FromString(str));

  // Pass a nullptr size
  const char* cstring = PyUnicode_AsUTF8AndSize(pyunicode, nullptr);
  ASSERT_NE(nullptr, cstring);
  EXPECT_STREQ(str, cstring);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8WithSubClassReturnsCString) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("some string")
)");
  PyObjectPtr substr(mainModuleGet("substr"));
  Py_ssize_t size = 0;
  const char* expected = "some string";

  const char* c_str = PyUnicode_AsUTF8AndSize(substr, &size);
  ASSERT_NE(c_str, nullptr);
  EXPECT_STREQ(c_str, expected);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8WithReferencedSizeReturnsCString) {
  const char* str = "Some C String";
  PyObjectPtr pyunicode(PyUnicode_FromString(str));

  // Pass a size reference
  Py_ssize_t size = 0;
  const char* cstring = PyUnicode_AsUTF8AndSize(pyunicode, &size);
  ASSERT_NE(nullptr, cstring);
  EXPECT_STREQ(str, cstring);
  EXPECT_EQ(size, static_cast<Py_ssize_t>(std::strlen(str)));

  // Repeated calls should return the same buffer and still set the size.
  size = 0;
  const char* cstring2 = PyUnicode_AsUTF8AndSize(pyunicode, &size);
  ASSERT_NE(cstring2, nullptr);
  EXPECT_EQ(cstring2, cstring);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8ReturnsCString) {
  const char* str = "Some other C String";
  PyObjectPtr pyobj(PyUnicode_FromString(str));

  const char* cstring = PyUnicode_AsUTF8(pyobj);
  ASSERT_NE(cstring, nullptr);
  EXPECT_STREQ(cstring, str);

  // Make sure repeated calls on the same object return the same buffer.
  const char* cstring2 = PyUnicode_AsUTF8(pyobj);
  ASSERT_NE(cstring2, nullptr);
  EXPECT_EQ(cstring2, cstring);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8WithSurrogatesRaisesUnicodeEncodeError) {
  PyObjectPtr str(PyUnicode_DecodeLocale("hello\x80world", "surrogateescape"));

  EXPECT_EQ(PyUnicode_AsUTF8(str), nullptr);
  PyObject *exc, *value, *tb;
  PyErr_Fetch(&exc, &value, &tb);
  ASSERT_NE(exc, nullptr);
  ASSERT_TRUE(PyErr_GivenExceptionMatches(exc, PyExc_UnicodeEncodeError));
  Py_ssize_t temp;
  PyObjectPtr msg(PyUnicodeEncodeError_GetReason(value));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(msg, "surrogates not allowed"));
  PyUnicodeEncodeError_GetStart(value, &temp);
  EXPECT_EQ(temp, 5);
  PyUnicodeEncodeError_GetEnd(value, &temp);
  EXPECT_EQ(temp, 6);
  Py_DECREF(exc);
  Py_DECREF(value);
  Py_XDECREF(tb);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8StringWithNonStringReturnsNull) {
  PyObjectPtr bytes(_PyUnicode_AsUTF8String(Py_None, nullptr));
  ASSERT_EQ(bytes, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8StringReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  PyObjectPtr bytes(_PyUnicode_AsUTF8String(unicode, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 3);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo");
}

TEST_F(UnicodeExtensionApiTest,
       AsUTF8StringWithInvalidCodepointRaisesEncodeError) {
  PyObjectPtr unicode(PyUnicode_DecodeASCII("h\x80i", 3, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(unicode));
  PyObjectPtr bytes(_PyUnicode_AsUTF8String(unicode, nullptr));
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeEncodeError));
  EXPECT_EQ(bytes, nullptr);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8StringWithReplaceErrorsReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_DecodeASCII("foo\x80", 4, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(unicode));
  PyObjectPtr bytes(_PyUnicode_AsUTF8String(unicode, "replace"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 4);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo?");
}

TEST_F(UnicodeExtensionApiTest, AsUCS4WithNonStringReturnsNull) {
  // Pass a non string object.
  Py_UCS4* ucs4_string = PyUnicode_AsUCS4(Py_None, nullptr, 0, 0);
  EXPECT_EQ(nullptr, ucs4_string);
}

TEST_F(UnicodeExtensionApiTest, AsUTF8StringWithSubClassReturnsBytes) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("foo")
)");
  PyObjectPtr substr(mainModuleGet("substr"));
  PyObjectPtr bytes(_PyUnicode_AsUTF8String(substr, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 3);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo");
}

TEST_F(UnicodeExtensionApiTest, AsUCS4WithNullBufferReturnsNull) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  Py_UCS4* ucs4_string = PyUnicode_AsUCS4(unicode, nullptr, 0, 0);
  EXPECT_EQ(nullptr, ucs4_string);
}

TEST_F(UnicodeExtensionApiTest,
       AsUCS4WithShortBufferWithoutCopyNullReturnsNotNullTerminated) {
  PyObjectPtr unicode(PyUnicode_FromString("abc"));
  Py_UCS4 target[4];
  target[0] = 1;
  Py_UCS4* ucs4_string =
      PyUnicode_AsUCS4(unicode, target, 2, 0 /* copy_null */);
  EXPECT_EQ(nullptr, ucs4_string);
  EXPECT_EQ(Py_UCS4{1}, target[0]);
}

TEST_F(UnicodeExtensionApiTest,
       AsUCS4WithShortBufferWithCopyNullReturnsNullTerminated) {
  PyObjectPtr unicode(PyUnicode_FromString("abc"));
  Py_UCS4 target[4];
  target[0] = 1;
  Py_UCS4* ucs4_string =
      PyUnicode_AsUCS4(unicode, target, 2, 1 /* copy_null */);
  EXPECT_EQ(nullptr, ucs4_string);
  EXPECT_EQ(Py_UCS4{0}, target[0]);
}

TEST_F(UnicodeExtensionApiTest, AsUCS4WithoutCopyNullReturnsNotNullTerminated) {
  Py_UCS4 buffer[] = {0x1f192, 'h', 0xe4, 'l', 0x2cc0};
  PyObjectPtr unicode(PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND, buffer,
                                                Py_ARRAY_LENGTH(buffer)));
  Py_UCS4 target[6];
  target[5] = 1;
  Py_UCS4* ucs4_string =
      PyUnicode_AsUCS4(unicode, target, 5, 0 /* copy_null */);
  EXPECT_EQ(target, ucs4_string);
  EXPECT_EQ(Py_UCS4{0x1F192}, ucs4_string[0]);
  EXPECT_EQ(Py_UCS4{'h'}, ucs4_string[1]);
  EXPECT_EQ(Py_UCS4{0xE4}, ucs4_string[2]);
  EXPECT_EQ(Py_UCS4{'l'}, ucs4_string[3]);
  EXPECT_EQ(Py_UCS4{0x2CC0}, ucs4_string[4]);
  EXPECT_EQ(Py_UCS4{1}, ucs4_string[5]);
}

TEST_F(UnicodeExtensionApiTest, AsUCS4WithCopyNullReturnsNullTerminated) {
  Py_UCS4 buffer[] = {0x1f192, 'h', 0xe4, 'l', 0x2cc0};
  PyObjectPtr unicode(PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND, buffer,
                                                Py_ARRAY_LENGTH(buffer)));
  Py_UCS4 target[6];
  target[5] = 1;
  Py_UCS4* ucs4_string =
      PyUnicode_AsUCS4(unicode, target, 6, 1 /* copy_null */);
  EXPECT_EQ(target, ucs4_string);
  EXPECT_EQ(Py_UCS4{0x1F192}, ucs4_string[0]);
  EXPECT_EQ(Py_UCS4{'h'}, ucs4_string[1]);
  EXPECT_EQ(Py_UCS4{0xE4}, ucs4_string[2]);
  EXPECT_EQ(Py_UCS4{'l'}, ucs4_string[3]);
  EXPECT_EQ(Py_UCS4{0x2CC0}, ucs4_string[4]);
  EXPECT_EQ(Py_UCS4{0}, ucs4_string[5]);
}

TEST_F(UnicodeExtensionApiTest,
       AsUCS4WithSubClassAndCopyNullReturnsNullTerminatedString) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("foo")
)");
  PyObjectPtr unicode(mainModuleGet("substr"));
  Py_UCS4 target[4];
  Py_UCS4* ucs4_string =
      PyUnicode_AsUCS4(unicode, target, 4, 1 /* copy_null */);
  EXPECT_EQ(Py_UCS4{'f'}, ucs4_string[0]);
  EXPECT_EQ(Py_UCS4{'o'}, ucs4_string[1]);
  EXPECT_EQ(Py_UCS4{'o'}, ucs4_string[2]);
  EXPECT_EQ(Py_UCS4{0}, ucs4_string[3]);
}

// Delegating testing to AsUCS4.
TEST_F(UnicodeExtensionApiTest,
       AsUCS4WithNonAsciiReturnsCodePointsNullTerminated) {
  PyObjectPtr unicode(PyUnicode_FromString("ab\u00e4p"));
  Py_UCS4* ucs4_string = PyUnicode_AsUCS4Copy(unicode);
  EXPECT_EQ(Py_UCS4{'a'}, ucs4_string[0]);
  EXPECT_EQ(Py_UCS4{'b'}, ucs4_string[1]);
  EXPECT_EQ(Py_UCS4{0xE4}, ucs4_string[2]);
  EXPECT_EQ(Py_UCS4{'p'}, ucs4_string[3]);
  EXPECT_EQ(Py_UCS4{0}, ucs4_string[4]);
  PyMem_Free(ucs4_string);
}

TEST_F(UnicodeExtensionApiTest, AsWideCharWithNullptrRaisesSystemError) {
  wchar_t wide_string[1];
  EXPECT_EQ(
      PyUnicode_AsWideChar(nullptr, wide_string, Py_ARRAY_LENGTH(wide_string)),
      -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, AsWideCharWithNonStringRaisesTypeError) {
  PyObjectPtr not_string(PyTuple_New(0));
  wchar_t wide_string[1];
  EXPECT_EQ(PyUnicode_AsWideChar(not_string, wide_string,
                                 Py_ARRAY_LENGTH(wide_string)),
            -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest,
       AsWideCharWithNonASCIICodePointReturnsNullTerminatedWideCharString) {
  PyObjectPtr unicode(PyUnicode_FromString("a\xc3\xa5z"));
  wchar_t wide_string[4];
  EXPECT_EQ(Py_ssize_t{3}, PyUnicode_AsWideChar(unicode, wide_string,
                                                Py_ARRAY_LENGTH(wide_string)));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ(0xe5, wide_string[1]);
  EXPECT_EQ('z', wide_string[2]);
  EXPECT_EQ(0, wide_string[3]);
}

TEST_F(UnicodeExtensionApiTest, AsWideCharCopiesUpToSizeElements) {
  PyObjectPtr unicode(PyUnicode_FromString("abcdef"));
  wchar_t wide_string[5] = {'x', 'x', 'x', 'x', 'x'};
  EXPECT_EQ(Py_ssize_t{3}, PyUnicode_AsWideChar(unicode, wide_string, 3));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ('b', wide_string[1]);
  EXPECT_EQ('c', wide_string[2]);
  EXPECT_EQ('x', wide_string[3]);
  EXPECT_EQ('x', wide_string[4]);
}

TEST_F(UnicodeExtensionApiTest, AsWideCharWithEmbeddedNullWritesNullChar) {
  PyObjectPtr unicode(PyUnicode_FromStringAndSize("ab\0c", 4));
  wchar_t wide_string[5];
  EXPECT_EQ(4, PyUnicode_AsWideChar(unicode, wide_string,
                                    Py_ARRAY_LENGTH(wide_string)));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ('b', wide_string[1]);
  EXPECT_EQ('\0', wide_string[2]);
  EXPECT_EQ('c', wide_string[3]);
  EXPECT_EQ('\0', wide_string[4]);
}

TEST_F(UnicodeExtensionApiTest,
       AsWideCharWithSizeEqualsBufferSizeDoesNotWriteNul) {
  PyObjectPtr unicode(PyUnicode_FromStringAndSize("ab\0c", 4));
  wchar_t wide_string[4];
  EXPECT_EQ(4, PyUnicode_AsWideChar(unicode, wide_string, 4));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ('b', wide_string[1]);
  EXPECT_EQ('\0', wide_string[2]);
  EXPECT_EQ('c', wide_string[3]);
}

TEST_F(UnicodeExtensionApiTest,
       AsWideCharWithBufferSizeLessThanStringSizeWritesUpToBufferSize) {
  PyObjectPtr unicode(PyUnicode_FromStringAndSize("ab\0c", 4));
  wchar_t wide_string[2];
  EXPECT_EQ(2, PyUnicode_AsWideChar(unicode, wide_string,
                                    Py_ARRAY_LENGTH(wide_string)));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ('b', wide_string[1]);
}

TEST_F(UnicodeExtensionApiTest, AsWideCharStringWithNullptrRaisesSystemError) {
  EXPECT_EQ(PyUnicode_AsWideCharString(nullptr, nullptr), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, AsWideCharStringWithNonStringRaisesTypeError) {
  PyObjectPtr not_string(PyTuple_New(0));
  EXPECT_EQ(PyUnicode_AsWideCharString(not_string, nullptr), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(
    UnicodeExtensionApiTest,
    AsWideCharStringWithNonASCIICodePointReturnsNullTerminatedWideCharString) {
  PyObjectPtr unicode(PyUnicode_FromString("a\xc3\xa5z"));
  wchar_t* wide_string = PyUnicode_AsWideCharString(unicode, nullptr);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ(0xe5, wide_string[1]);
  EXPECT_EQ('z', wide_string[2]);
  EXPECT_EQ(0, wide_string[3]);
  PyMem_Free(wide_string);
}

TEST_F(UnicodeExtensionApiTest, AsWideCharStringWithNonNullSizeSetsSize) {
  PyObjectPtr unicode(PyUnicode_FromString("a\xc3\xa5z"));
  Py_ssize_t size = 0xdeadbeef;
  wchar_t* wide_string = PyUnicode_AsWideCharString(unicode, &size);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ(size, 3);
  EXPECT_EQ('a', wide_string[0]);
  EXPECT_EQ(0xe5, wide_string[1]);
  EXPECT_EQ('z', wide_string[2]);
  EXPECT_EQ(0, wide_string[3]);
  PyMem_Free(wide_string);
}

TEST_F(UnicodeExtensionApiTest,
       AsWideCharStringWithEmbeddedNullRaisesValueError) {
  PyObjectPtr unicode(PyUnicode_FromStringAndSize("ab\0c", 4));
  EXPECT_EQ(PyUnicode_AsWideCharString(unicode, nullptr), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, CheckWithStrReturnsTrue) {
  PyObjectPtr str(PyUnicode_FromString("ab\u00e4p"));
  EXPECT_TRUE(PyUnicode_Check(str));
  EXPECT_TRUE(PyUnicode_CheckExact(str));
}

TEST_F(UnicodeExtensionApiTest, CheckWithSubClassIsNotExact) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr('ok')
)");
  PyObjectPtr substr(mainModuleGet("substr"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyUnicode_Check(substr));
  EXPECT_FALSE(PyUnicode_CheckExact(substr));
}

TEST_F(UnicodeExtensionApiTest, CheckWithUnrelatedTypeReturnsFalse) {
  PyObjectPtr pylong(PyLong_FromLong(10));
  EXPECT_FALSE(PyUnicode_Check(pylong));
  EXPECT_FALSE(PyUnicode_CheckExact(pylong));
}

TEST_F(UnicodeExtensionApiTest, DATAReturnsCStringContainingStrContents) {
  const char* cstr = "hello";
  PyObjectPtr str(PyUnicode_FromString(cstr));
  void* data = PyUnicode_DATA(str.get());
  EXPECT_STREQ(reinterpret_cast<char*>(data), cstr);
}

TEST_F(UnicodeExtensionApiTest, DATAReturnsSamePointer) {
  PyObjectPtr str(PyUnicode_FromString("hello"));
  void* p1 = PyUnicode_DATA(str.get());
  void* p2 = PyUnicode_DATA(str.get());
  EXPECT_EQ(p1, p2);
}

TEST_F(UnicodeExtensionApiTest, FormatWithNullFormatRaisesBadInternalCall) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  EXPECT_EQ(nullptr, PyUnicode_Format(nullptr, str));
  ASSERT_NE(nullptr, PyErr_Occurred());
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, FormatWithNullArgsRaisesBadInternalCall) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  EXPECT_EQ(nullptr, PyUnicode_Format(str, nullptr));
  ASSERT_NE(nullptr, PyErr_Occurred());
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, FormatWithNonStrFormatRaisesTypeError) {
  PyObjectPtr format(PyLong_FromLong(10));
  PyObjectPtr str(PyUnicode_FromString("foo"));
  EXPECT_EQ(nullptr, PyUnicode_Format(format, str));
  ASSERT_NE(nullptr, PyErr_Occurred());
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest,
       FormatWithMismatchedFormatAndArgsRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("foo%s%s"));
  PyObjectPtr args(PyUnicode_FromString("bar"));
  EXPECT_EQ(nullptr, PyUnicode_Format(str, args));
  ASSERT_NE(nullptr, PyErr_Occurred());
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, FormatWithStrArgsReturnsStr) {
  PyObjectPtr str(PyUnicode_FromString("foo%s"));
  PyObjectPtr args(PyUnicode_FromString("bar"));
  PyObjectPtr result(PyUnicode_Format(str, args));
  EXPECT_NE(nullptr, result);
  EXPECT_EQ(nullptr, PyErr_Occurred());
  EXPECT_TRUE(isUnicodeEqualsCStr(result, "foobar"));
}

TEST_F(UnicodeExtensionApiTest, FormatWithTupleArgsReturnsStr) {
  PyObjectPtr str(PyUnicode_FromString("foo%s%s"));
  PyObjectPtr args(PyTuple_Pack(2, PyUnicode_FromString("bar"),
                                PyUnicode_FromString("baz")));
  PyObjectPtr result(PyUnicode_Format(str, args));
  EXPECT_NE(nullptr, result);
  EXPECT_EQ(nullptr, PyErr_Occurred());
  EXPECT_TRUE(isUnicodeEqualsCStr(result, "foobarbaz"));
}

TEST_F(UnicodeExtensionApiTest, FSDecoderWithStrSetsString) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  PyObject* result;
  EXPECT_EQ(PyUnicode_FSDecoder(str, &result), Py_CLEANUP_SUPPORTED);

  EXPECT_TRUE(isUnicodeEqualsCStr(result, "foo"));

  EXPECT_EQ(PyUnicode_FSDecoder(nullptr, &result), 1);
  EXPECT_EQ(result, nullptr);
}

TEST_F(UnicodeExtensionApiTest, FSDecoderWithBytesSetsString) {
  const char bytes[] = "bar";
  PyObjectPtr pybytes(PyBytes_FromStringAndSize(bytes, sizeof(bytes) - 1));
  PyObject* result;
  EXPECT_EQ(PyUnicode_FSDecoder(pybytes, &result), Py_CLEANUP_SUPPORTED);

  EXPECT_TRUE(isUnicodeEqualsCStr(result, bytes));

  EXPECT_EQ(PyUnicode_FSDecoder(nullptr, &result), 1);
  EXPECT_EQ(result, nullptr);
}

TEST_F(UnicodeExtensionApiTest, FSDecoderRaisesValueError) {
  const char bytes[] = "foo\0bar";
  PyObjectPtr pybytes(PyBytes_FromStringAndSize(bytes, sizeof(bytes) - 1));
  PyObject* result;
  EXPECT_EQ(PyUnicode_FSDecoder(pybytes, &result), 0);
  EXPECT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, FSDecoderRaisesTypeError) {
  PyObjectPtr pyint(PyLong_FromLong(42));
  PyObject* result;
  EXPECT_EQ(PyUnicode_FSDecoder(pyint, &result), 0);
  EXPECT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, FindWithNonStrSelfRaisesTypeError) {
  PyObject* self = Py_None;
  PyObjectPtr sub(PyUnicode_FromString("ll"));
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 5, 1), -2);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, FindWithNonStrSubRaisesTypeError) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  PyObject* sub = Py_None;
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 5, 1), -2);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, FindForwardReturnsLeftmostStartIndex) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  PyObjectPtr sub(PyUnicode_FromString("ll"));
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 5, 1), 2);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       FindForwardWithSubClassReturnsLeftmostStartIndex) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr('hello')
)");
  PyObjectPtr self(mainModuleGet("substr"));
  PyObjectPtr sub(PyUnicode_FromString("ll"));
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 5, 1), 2);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindReturnsNegativeOneWithNonexistentSubstr) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  PyObjectPtr sub(PyUnicode_FromString("xx"));
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 5, 1), -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       FindReverseReturnsNegativeOneWithNonexistentSubstr) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  PyObjectPtr sub(PyUnicode_FromString("xx"));
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 5, -1), -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindReverseReturnsRightmostStartIndex) {
  PyObjectPtr self(PyUnicode_FromString("helloll"));
  PyObjectPtr sub(PyUnicode_FromString("ll"));
  EXPECT_EQ(PyUnicode_Find(self, sub, 0, 7, -1), 5);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithNegativeStartSearchesFromEnd) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  EXPECT_EQ(4, PyUnicode_FindChar(self, Py_UCS4{'o'}, -2, 5, 1));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithNegativeEndSearchesFromEnd) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  EXPECT_EQ(1, PyUnicode_FindChar(self, Py_UCS4{'e'}, 0, -3, 1));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       FindCharWithExistentCharEndGreaterThanLengthClipsEnd) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'h';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 100, 1), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       FindCharWithNonExistentCharEndGreaterThanLengthClipsEnd) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'q';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 100, 1), -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharFindsChar) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'h';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 5, 1), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithStrSubClassReturnsLeftmostIndex) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr('hello')
)");
  PyObjectPtr self(mainModuleGet("substr"));
  Py_UCS4 ch = 'h';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 5, 1), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharFindsCharInMiddleOfString) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'l';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 5, 1), 2);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharReverseFindsCharInMiddleOfString) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'l';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 5, -1), 3);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithNonExistentCharDoesNotFindChar) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'q';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 5, 1), -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithCharBeforeWindowDoesNotFindChar) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'h';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 2, 5, 1), -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithCharAfterWindowDoesNotFindChar) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  Py_UCS4 ch = 'o';
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 3, 1), -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FindCharWithUnicodeCharFindsChar) {
  PyObjectPtr self(PyUnicode_FromString("h\u00e9llo"));
  Py_UCS4 ch = 0xE9;
  EXPECT_EQ(PyUnicode_FindChar(self, ch, 0, 3, 1), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FromStringAndSizeCreatesEmptyString) {
  PyObjectPtr pyuni(PyUnicode_FromStringAndSize(nullptr, 0));
  EXPECT_TRUE(isUnicodeEqualsCStr(pyuni, ""));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FromStringAndSizeCreatesSizedString) {
  const char* str = "Some string";
  PyObjectPtr pyuni(PyUnicode_FromStringAndSize(str, 11));
  EXPECT_TRUE(isUnicodeEqualsCStr(pyuni, str));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FromStringAndSizeCreatesSmallerString) {
  PyObjectPtr str(PyUnicode_FromStringAndSize("1234567890", 5));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "12345"));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FromStringAndSizeFailsNegSize) {
  PyObjectPtr pyuni(PyUnicode_FromStringAndSize("a", -1));
  ASSERT_EQ(pyuni, nullptr);

  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, FromStringAndSizeIncrementsRefCount) {
  PyObject* pyuni = PyUnicode_FromStringAndSize("Some string", 11);
  ASSERT_NE(pyuni, nullptr);
  EXPECT_GE(Py_REFCNT(pyuni), 1);
  Py_DECREF(pyuni);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, READWithOneByteKindReturnsCharAtIndex) {
  const char* str = "foo";
  EXPECT_EQ(PyUnicode_READ(PyUnicode_1BYTE_KIND, str, 0), Py_UCS4{'f'});
  EXPECT_EQ(PyUnicode_READ(PyUnicode_1BYTE_KIND, str, 1), Py_UCS4{'o'});
  EXPECT_EQ(PyUnicode_READ(PyUnicode_1BYTE_KIND, str, 2), Py_UCS4{'o'});
}

TEST_F(UnicodeExtensionApiTest, READWithTwoByteKindReturnsCharAtIndex) {
  const char* str = "quux";
  // This assumes little-endian architecture. No static assert because we can't
  // include that enum and macro in these tests.
  EXPECT_EQ(PyUnicode_READ(PyUnicode_2BYTE_KIND, str, 0),
            Py_UCS4{0x7571});  // qu
  EXPECT_EQ(PyUnicode_READ(PyUnicode_2BYTE_KIND, str, 1),
            Py_UCS4{0x7875});  // ux
}

TEST_F(UnicodeExtensionApiTest, READWithFourByteKindReturnsCharAtIndex) {
  const char* str = "quux";
  // This assumes little-endian architecture. No static assert because we can't
  // include that enum and macro in these tests.
  EXPECT_EQ(PyUnicode_READ(PyUnicode_4BYTE_KIND, str, 0), Py_UCS4{0x78757571});
}

TEST_F(UnicodeExtensionApiTest, READCHARReturnsCharAtIndex) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  EXPECT_EQ(PyUnicode_READ_CHAR(str.get(), 0), Py_UCS4{'f'});
  EXPECT_EQ(PyUnicode_READ_CHAR(str.get(), 1), Py_UCS4{'o'});
  EXPECT_EQ(PyUnicode_READ_CHAR(str.get(), 2), Py_UCS4{'o'});
  EXPECT_EQ(PyUnicode_READ_CHAR(str.get(), 3), Py_UCS4{'\0'});
}

TEST_F(UnicodeExtensionApiTest, READCHARReturnsUnicodeCodePointAtIndex) {
  PyObjectPtr str(PyUnicode_FromString("\xF0\x90\x8D\x88"));
  EXPECT_EQ(PyUnicode_GET_LENGTH(str.get()), 1);
  EXPECT_EQ(PyUnicode_READ_CHAR(str.get(), 0), Py_UCS4{0x10348});
  EXPECT_EQ(PyUnicode_READ_CHAR(str.get(), 1), Py_UCS4{'\0'});

  PyObjectPtr dessert(PyUnicode_FromString("cr\xc3\xa9me"));
  EXPECT_EQ(PyUnicode_GET_LENGTH(dessert.get()), 5);
  EXPECT_EQ(PyUnicode_READ_CHAR(dessert.get(), 0), Py_UCS4{'c'});
  EXPECT_EQ(PyUnicode_READ_CHAR(dessert.get(), 1), Py_UCS4{'r'});
  EXPECT_EQ(PyUnicode_READ_CHAR(dessert.get(), 2), Py_UCS4{0xE9});
  EXPECT_EQ(PyUnicode_READ_CHAR(dessert.get(), 3), Py_UCS4{'m'});
  EXPECT_EQ(PyUnicode_READ_CHAR(dessert.get(), 4), Py_UCS4{'e'});
  EXPECT_EQ(PyUnicode_READ_CHAR(dessert.get(), 5), Py_UCS4{'\0'});
}

TEST_F(UnicodeExtensionApiTest, READReadsCharsFromDATA) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  void* data = PyUnicode_DATA(str.get());
  EXPECT_EQ(PyUnicode_READ(PyUnicode_1BYTE_KIND, data, 0), Py_UCS4{'f'});
  EXPECT_EQ(PyUnicode_READ(PyUnicode_1BYTE_KIND, data, 1), Py_UCS4{'o'});
  EXPECT_EQ(PyUnicode_READ(PyUnicode_1BYTE_KIND, data, 2), Py_UCS4{'o'});
}

TEST_F(UnicodeExtensionApiTest, ReadCharReturnsCharAtIndex) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  EXPECT_EQ(PyUnicode_ReadChar(str.get(), 0), Py_UCS4{'f'});
  EXPECT_EQ(PyUnicode_ReadChar(str.get(), 1), Py_UCS4{'o'});
  EXPECT_EQ(PyUnicode_ReadChar(str.get(), 2), Py_UCS4{'o'});
}

TEST_F(UnicodeExtensionApiTest, ReadCharReturnsUnicodeCodePointAtIndex) {
  PyObjectPtr str(PyUnicode_FromString("\xF0\x90\x8D\x88"));
  EXPECT_EQ(PyUnicode_GET_LENGTH(str.get()), 1);
  EXPECT_EQ(PyUnicode_ReadChar(str.get(), 0), Py_UCS4{0x10348});
  EXPECT_EQ(PyUnicode_ReadChar(str.get(), 1), Py_UCS4{0xFFFFFFFF});
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_IndexError));
  PyErr_Clear();

  PyObjectPtr dessert(PyUnicode_FromString("cr\xc3\xa9me"));
  EXPECT_EQ(PyUnicode_GET_LENGTH(dessert.get()), 5);
  EXPECT_EQ(PyUnicode_ReadChar(dessert.get(), 0), Py_UCS4{'c'});
  EXPECT_EQ(PyUnicode_ReadChar(dessert.get(), 1), Py_UCS4{'r'});
  EXPECT_EQ(PyUnicode_ReadChar(dessert.get(), 2), Py_UCS4{0xE9});
  EXPECT_EQ(PyUnicode_ReadChar(dessert.get(), 3), Py_UCS4{'m'});
  EXPECT_EQ(PyUnicode_ReadChar(dessert.get(), 4), Py_UCS4{'e'});
  EXPECT_EQ(PyUnicode_ReadChar(dessert.get(), 5), Py_UCS4{0xFFFFFFFF});
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_IndexError));
  PyErr_Clear();
}

TEST_F(UnicodeExtensionApiTest, ReadCharWithNonStrRaisesTypeError) {
  PyObjectPtr list(PyList_New(3));
  EXPECT_EQ(PyUnicode_ReadChar(list.get(), 0), Py_UCS4{0xFFFFFFFF});
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, ReadCharWithOutOfBoundIndexRaisesIndexError) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  EXPECT_EQ(PyUnicode_ReadChar(str.get(), 3), Py_UCS4{0xFFFFFFFF});
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_IndexError));
}

TEST_F(UnicodeExtensionApiTest, ReadyReturnsZero) {
  PyObject* pyunicode = PyUnicode_FromString("some string");
  int is_ready = PyUnicode_READY(pyunicode);
  EXPECT_EQ(0, is_ready);
  Py_DECREF(pyunicode);
}

TEST_F(UnicodeExtensionApiTest, ReplaceWithStrOfNonStringTypeReturnsNull) {
  PyObjectPtr non_str(PyBool_FromLong(1));
  PyObjectPtr substr(PyUnicode_FromString("some string"));
  PyObjectPtr replstr(PyUnicode_FromString("some string"));
  EXPECT_EQ(PyUnicode_Replace(non_str, substr, replstr, -1), nullptr);
  EXPECT_NE(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, ReplaceWithSubstrOfNonStringTypeReturnsNull) {
  PyObjectPtr non_str(PyBool_FromLong(1));
  PyObjectPtr str(PyUnicode_FromString("some string"));
  PyObjectPtr replstr(PyUnicode_FromString("some string"));
  EXPECT_EQ(PyUnicode_Replace(str, non_str, replstr, -1), nullptr);
  EXPECT_NE(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, ReplaceWithReplstrOfNonStringTypeReturnsNull) {
  PyObjectPtr non_str(PyBool_FromLong(1));
  PyObjectPtr str(PyUnicode_FromString("some string"));
  PyObjectPtr substr(PyUnicode_FromString("some string"));
  EXPECT_EQ(PyUnicode_Replace(str, substr, non_str, -1), nullptr);
  EXPECT_NE(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       ReplaceWithStrSubclassReturnStrWithSameContent) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

subclass_instance = SubStr("hello world!")
)");
  PyObjectPtr subclass_instance(mainModuleGet("subclass_instance"));
  PyObjectPtr substr(PyUnicode_FromString("some string"));
  PyObjectPtr replstr(PyUnicode_FromString("some string"));
  PyObjectPtr result(PyUnicode_Replace(subclass_instance, substr, replstr, -1));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyUnicode_CheckExact(result));
  EXPECT_TRUE(isUnicodeEqualsCStr(result, "hello world!"));
}

TEST_F(UnicodeExtensionApiTest,
       ReplaceWithNegativeMaxcountReturnsResultReplacingAllSubstr) {
  PyObjectPtr str(PyUnicode_FromString("22122122122122122"));
  PyObjectPtr substr(PyUnicode_FromString("22"));
  PyObjectPtr replstr(PyUnicode_FromString("*"));
  PyObjectPtr expected(PyUnicode_FromString("*1*1*1*1*1*"));
  PyObjectPtr actual(PyUnicode_Replace(str, substr, replstr, -1));
  EXPECT_EQ(_PyUnicode_EQ(actual, expected), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       ReplaceWithSubClassAndNegativeMaxcountReturnsResultReplacingAllSubstr) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

str_val = SubStr("22122122122122122")
substr = SubStr("22")
replstr = SubStr("*")
)");
  PyObjectPtr str(mainModuleGet("str_val"));
  PyObjectPtr substr(mainModuleGet("substr"));
  PyObjectPtr replstr(mainModuleGet("replstr"));
  PyObjectPtr expected(PyUnicode_FromString("*1*1*1*1*1*"));
  PyObjectPtr actual(PyUnicode_Replace(str, substr, replstr, -1));
  EXPECT_EQ(_PyUnicode_EQ(actual, expected), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       ReplaceWithLimitedMaxcountReturnsResultReplacingUpToMaxcount) {
  PyObjectPtr str(PyUnicode_FromString("22122122122122122"));
  PyObjectPtr substr(PyUnicode_FromString("22"));
  PyObjectPtr replstr(PyUnicode_FromString("*"));
  PyObjectPtr expected(PyUnicode_FromString("*1*1*122122122"));
  PyObjectPtr actual(PyUnicode_Replace(str, substr, replstr, 3));
  EXPECT_EQ(_PyUnicode_EQ(actual, expected), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, Compare) {
  PyObject* s1 = PyUnicode_FromString("some string");
  PyObject* s2 = PyUnicode_FromString("some longer string");
  PyObject* s22 = PyUnicode_FromString("some longer string");

  int result = PyUnicode_Compare(s1, s2);
  EXPECT_EQ(result, 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);

  result = PyUnicode_Compare(s2, s1);
  EXPECT_EQ(result, -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);

  result = PyUnicode_Compare(s2, s22);
  EXPECT_EQ(result, 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);

  Py_DECREF(s22);
  Py_DECREF(s2);
  Py_DECREF(s1);
}

TEST_F(UnicodeExtensionApiTest, CompareWithSubClass) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("some string")
)");
  PyObjectPtr s1(mainModuleGet("substr"));
  PyObjectPtr s2(PyUnicode_FromString("some longer string"));
  PyObjectPtr s22(PyUnicode_FromString("some longer string"));

  int result = PyUnicode_Compare(s1, s2);
  EXPECT_EQ(result, 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);

  result = PyUnicode_Compare(s2, s1);
  EXPECT_EQ(result, -1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);

  result = PyUnicode_Compare(s2, s22);
  EXPECT_EQ(result, 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, CompareBadInput) {
  PyObject* str_obj = PyUnicode_FromString("this is a string");
  PyObject* int_obj = PyLong_FromLong(1234);

  PyUnicode_Compare(str_obj, int_obj);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
  PyErr_Clear();

  PyUnicode_Compare(int_obj, str_obj);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
  PyErr_Clear();

  PyUnicode_Compare(int_obj, int_obj);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
  PyErr_Clear();

  Py_DECREF(int_obj);
  Py_DECREF(str_obj);
}

TEST_F(UnicodeExtensionApiTest, EqSameLength) {
  PyObject* str1 = PyUnicode_FromString("some string");

  PyObject* str2 = PyUnicode_FromString("some other string");
  EXPECT_EQ(_PyUnicode_EQ(str1, str2), 0);
  EXPECT_EQ(_PyUnicode_EQ(str2, str1), 0);
  Py_DECREF(str2);

  PyObject* str3 = PyUnicode_FromString("some string");
  EXPECT_EQ(_PyUnicode_EQ(str1, str3), 1);
  EXPECT_EQ(_PyUnicode_EQ(str3, str1), 1);
  Py_DECREF(str3);

  Py_DECREF(str1);
}

TEST_F(UnicodeExtensionApiTest, EqWithSubClassSameLength) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("some string")
)");
  PyObjectPtr str(mainModuleGet("substr"));
  PyObjectPtr str1(PyUnicode_FromString("some string"));
  EXPECT_EQ(_PyUnicode_EQ(str1.get(), str.get()), 1);

  PyObjectPtr str2(PyUnicode_FromString("some other string"));
  EXPECT_EQ(_PyUnicode_EQ(str2.get(), str.get()), 0);
}

TEST_F(UnicodeExtensionApiTest, EqDifferentLength) {
  PyObject* small = PyUnicode_FromString("123");
  PyObject* large = PyUnicode_FromString("1234567890");
  EXPECT_EQ(_PyUnicode_EQ(small, large), 0);
  EXPECT_EQ(_PyUnicode_EQ(large, small), 0);
  Py_DECREF(large);
  Py_DECREF(small);
}

TEST_F(UnicodeExtensionApiTest, EqualToASCIIString) {
  PyObject* unicode = PyUnicode_FromString("here's another string");

  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(unicode, "here's another string"));
  EXPECT_FALSE(
      _PyUnicode_EqualToASCIIString(unicode, "here is another string"));

  Py_DECREF(unicode);
}

TEST_F(UnicodeExtensionApiTest, EqualToASCIIStringWithSubClass) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("here's another string")
)");
  PyObjectPtr unicode(mainModuleGet("substr"));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(unicode, "here's another string"));
  EXPECT_FALSE(
      _PyUnicode_EqualToASCIIString(unicode, "here is another string"));
}

TEST_F(UnicodeExtensionApiTest, CompareWithASCIIStringASCIINul) {
  PyObjectPtr pyunicode(PyUnicode_FromStringAndSize("large\0st", 8));

  // Less
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "largz"), -1);

  // Greater
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "large"), 1);
}

TEST_F(UnicodeExtensionApiTest, CompareWithASCIIStringASCII) {
  PyObjectPtr pyunicode(PyUnicode_FromString("large string"));

  // Equal
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "large string"), 0);

  // Less
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "large strings"), -1);
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "large tbigger"), -1);

  // Greater
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "large strin"), 1);
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(pyunicode, "large smaller"), 1);
}

TEST_F(UnicodeExtensionApiTest, CompareWithASCIIStringWithSubClass) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr("large string")
)");
  PyObjectPtr substr(mainModuleGet("substr"));

  // Equal
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(substr, "large string"), 0);

  // Less
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(substr, "large strings"), -1);
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(substr, "large tbigger"), -1);

  // Greater
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(substr, "large strin"), 1);
  EXPECT_EQ(PyUnicode_CompareWithASCIIString(substr, "large smaller"), 1);
}

TEST_F(UnicodeExtensionApiTest, GetLengthWithEmptyStrReturnsZero) {
  PyObjectPtr str(PyUnicode_FromString(""));
  Py_ssize_t expected = 0;
  EXPECT_EQ(PyUnicode_GetLength(str), expected);
  EXPECT_EQ(PyUnicode_GET_LENGTH(str.get()), expected);
  EXPECT_EQ(PyUnicode_GET_SIZE(str.get()), expected);
}

TEST_F(UnicodeExtensionApiTest, GetLengthWithNonEmptyString) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  Py_ssize_t expected = 3;
  EXPECT_EQ(PyUnicode_GetLength(str), expected);
  EXPECT_EQ(PyUnicode_GET_LENGTH(str.get()), expected);
  EXPECT_EQ(PyUnicode_GET_SIZE(str.get()), expected);
}

TEST_F(UnicodeExtensionApiTest, GetLengthWithSubClassOfNonEmptyString) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

substr = SubStr('foo')
)");
  PyObjectPtr str(mainModuleGet("substr"));
  Py_ssize_t expected = 3;
  EXPECT_EQ(PyUnicode_GetLength(str), expected);
  EXPECT_EQ(PyUnicode_GET_LENGTH(str.get()), expected);
  EXPECT_EQ(PyUnicode_GET_SIZE(str.get()), expected);
}

TEST_F(UnicodeExtensionApiTest, GetLengthWithUTF8ReturnsCodePointLength) {
  PyObjectPtr str(PyUnicode_FromString("\xc3\xa9"));
  Py_ssize_t expected = 1;
  EXPECT_EQ(PyUnicode_GetLength(str), expected);
  EXPECT_EQ(PyUnicode_GET_LENGTH(str.get()), expected);
  EXPECT_EQ(PyUnicode_GET_SIZE(str.get()), expected);
}

TEST_F(UnicodeExtensionApiTest, GetLengthWithNonStrRaisesTypeError) {
  PyObjectPtr list(PyList_New(3));
  EXPECT_EQ(PyUnicode_GetLength(list), -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, GetSizeWithNonStrRaisesTypeError) {
  PyObjectPtr list(PyList_New(3));
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  EXPECT_EQ(PyUnicode_GetSize(list), -1);
#pragma GCC diagnostic pop
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, GetSizeWithStrReturnsLength) {
  PyObjectPtr unicode(PyUnicode_FromString("abc"));
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  EXPECT_EQ(PyUnicode_GetSize(unicode), 3);
#pragma GCC diagnostic pop
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, FromUnicodeWithASCIIReturnsString) {
  PyObjectPtr unicode(PyUnicode_FromUnicode(L"abc123-", 7));
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "abc123-"));
}

TEST_F(UnicodeExtensionApiTest, FromUnicodeWithNullBufferAbortsPyro) {
  EXPECT_DEATH(PyUnicode_FromUnicode(nullptr, 2),
               "unimplemented: _PyUnicode_New");
}

TEST_F(UnicodeExtensionApiTest,
       FromOrdinalWithNegativeCodePointRaisesValueError) {
  EXPECT_EQ(PyUnicode_FromOrdinal(-1), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, FromOrdinalWithHugeCodePointRaisesValueError) {
  EXPECT_EQ(PyUnicode_FromOrdinal(0xFFFFFFFF), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, FromOrdinalWithValidCodePointReturnsString) {
  PyObjectPtr str(PyUnicode_FromOrdinal(1488));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_NE(str, nullptr);
  ASSERT_TRUE(PyUnicode_Check(str));
  EXPECT_STREQ(PyUnicode_AsUTF8(str), "\xD7\x90");
}

TEST_F(UnicodeExtensionApiTest,
       FromWideCharWithNullBufferAndZeroSizeReturnsEmpty) {
  PyObjectPtr empty(PyUnicode_FromWideChar(nullptr, 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_Check(empty));
  EXPECT_EQ(PyUnicode_GetLength(empty), 0);
}

TEST_F(UnicodeExtensionApiTest, FromWideCharWithNullBufferReturnsError) {
  PyObjectPtr empty(PyUnicode_FromWideChar(nullptr, 1));
  ASSERT_EQ(empty, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, FromWideCharWithUnknownSizeReturnsString) {
  PyObjectPtr unicode(PyUnicode_FromWideChar(L"abc123-", -1));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "abc123-"));
}

TEST_F(UnicodeExtensionApiTest, FromWideCharWithGivenSizeReturnsString) {
  PyObjectPtr unicode(PyUnicode_FromWideChar(L"abc123-", 6));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "abc123"));
}

TEST_F(UnicodeExtensionApiTest, FromWideCharWithBufferAndZeroSizeReturnsEmpty) {
  PyObjectPtr empty(PyUnicode_FromWideChar(L"abc", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_Check(empty));
  EXPECT_EQ(PyUnicode_GetLength(empty), 0);
}

TEST_F(UnicodeExtensionApiTest, DecodeWithNullEncodingReturnsUTF8) {
  const char* str = "utf-8 \xc3\xa8";
  PyObjectPtr uni(PyUnicode_Decode(str, 8, nullptr, nullptr));
  ASSERT_TRUE(PyUnicode_CheckExact(uni));
  EXPECT_STREQ(PyUnicode_AsUTF8(uni), str);
}

TEST_F(UnicodeExtensionApiTest, DecodeASCIIUsesErrorHandler) {
  PyObjectPtr uni(PyUnicode_Decode("non\xc3\xa8-ascii", 11, "ascii", "ignore"));
  ASSERT_TRUE(PyUnicode_CheckExact(uni));
  EXPECT_STREQ(PyUnicode_AsUTF8(uni), "non-ascii");
}

TEST_F(UnicodeExtensionApiTest, DecodeLatin1ReturnsLatin1) {
  PyObjectPtr uni(PyUnicode_Decode("latin-1 \xe8", 9, "latin-1", nullptr));
  ASSERT_TRUE(PyUnicode_CheckExact(uni));
  EXPECT_STREQ(PyUnicode_AsUTF8(uni), "latin-1 \xc3\xa8");
}

TEST_F(UnicodeExtensionApiTest, DecodeFSDefaultCreatesString) {
  PyObjectPtr unicode(PyUnicode_DecodeFSDefault("hello"));
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello"));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, DecodeFSDefaultAndSizeReturnsString) {
  PyObjectPtr unicode(PyUnicode_DecodeFSDefaultAndSize("hello", 5));
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello"));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest,
       DecodeFSDefaultAndSizeWithSmallerSizeReturnsString) {
  PyObjectPtr unicode(PyUnicode_DecodeFSDefaultAndSize("hello", 2));
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "he"));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, DecodeASCIIReturnsString) {
  PyObjectPtr str(PyUnicode_DecodeASCII("hello world", 11, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world"));
}

TEST_F(UnicodeExtensionApiTest, DecodeLatin1ReturnsString) {
  const char* c_str = "\xBFhello world?";
  PyObjectPtr str(PyUnicode_DecodeLatin1(c_str, std::strlen(c_str), nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ(PyUnicode_CheckExact(str), 1);
  EXPECT_STREQ(PyUnicode_AsUTF8(str), "\xC2\xBFhello world?");
}

TEST_F(UnicodeExtensionApiTest, PyUnicodeWriterPrepareWithLenZeroReturnsZero) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  ASSERT_EQ(_PyUnicodeWriter_Prepare(&writer, 0, 127), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, ""));
}

TEST_F(UnicodeExtensionApiTest,
       PyUnicodeWriterWithOverallocateSetOverallocates) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  writer.overallocate = 0;
  ASSERT_EQ(_PyUnicodeWriter_Prepare(&writer, 5, 127), 0);
  ASSERT_EQ(writer.size, 5);
  _PyUnicodeWriter_Dealloc(&writer);

  _PyUnicodeWriter_Init(&writer);
  writer.overallocate = 1;
  ASSERT_EQ(_PyUnicodeWriter_Prepare(&writer, 5, 127), 0);
  ASSERT_GT(writer.size, 5);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, ""));
}

TEST_F(UnicodeExtensionApiTest, PyUnicodeWriterCreatesEmptyString) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  PyObjectPtr empty(_PyUnicodeWriter_Finish(&writer));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_Check(empty));
  EXPECT_EQ(PyUnicode_GetLength(empty), 0);
}

TEST_F(UnicodeExtensionApiTest, PyUnicodeWriterWritesASCIIStrings) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  ASSERT_EQ(_PyUnicodeWriter_WriteASCIIString(&writer, "hello", 5), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteASCIIString(&writer, " world", 6), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello world"));
}

TEST_F(UnicodeExtensionApiTest,
       WriteASCIIStringWithNegativeLengthReturnsString) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  ASSERT_EQ(_PyUnicodeWriter_WriteASCIIString(&writer, "hello world", -1), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello world"));
}

TEST_F(UnicodeExtensionApiTest, WriteASCIIStringWithNonASCIIDeathTestPyro) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  EXPECT_DEATH(_PyUnicodeWriter_WriteASCIIString(&writer, "\xA0", 1),
               "_PyUnicodeWriter_WriteASCIIString only takes ASCII");
  _PyUnicodeWriter_Dealloc(&writer);
}

TEST_F(UnicodeExtensionApiTest, PyUnicodeWriterWritesChars) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  ASSERT_EQ(_PyUnicodeWriter_WriteChar(&writer, 'a'), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteChar(&writer, 0xA0), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteChar(&writer, 'g'), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  PyObjectPtr test(PyUnicode_FromString("a\xc2\xa0g"));
  EXPECT_TRUE(_PyUnicode_EQ(unicode, test));
}

TEST_F(UnicodeExtensionApiTest, PyUnicodeWriterWritesLatin1String) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  ASSERT_EQ(_PyUnicodeWriter_WriteLatin1String(&writer, "hello\xA0", 6), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteLatin1String(&writer, " world", 6), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  PyObjectPtr test(PyUnicode_FromString("hello\xc2\xa0 world"));
  EXPECT_TRUE(_PyUnicode_EQ(unicode, test));
}

TEST_F(UnicodeExtensionApiTest, PyUnicodeWriterWriteStrWritesStringObject) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  PyObjectPtr hello_str(PyUnicode_FromString("hello"));
  PyObjectPtr world_str(PyUnicode_FromString(" \xf0\x9f\x90\x8d world"));
  ASSERT_EQ(_PyUnicodeWriter_WriteStr(&writer, hello_str), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteStr(&writer, world_str), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello \xf0\x9f\x90\x8d world"));
}

TEST_F(UnicodeExtensionApiTest,
       PyUnicodeWriterWriteStrWithSubClassWritesStringObject) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

hello_str = SubStr("hello")
world_str = SubStr(" world")
)");
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  PyObjectPtr hello_str(mainModuleGet("hello_str"));
  PyObjectPtr world_str(mainModuleGet("world_str"));
  ASSERT_EQ(_PyUnicodeWriter_WriteStr(&writer, hello_str), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteStr(&writer, world_str), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello world"));
}

TEST_F(UnicodeExtensionApiTest,
       PyUnicodeWriterWriteSubstringWritesSubStringObject) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  PyObjectPtr str(PyUnicode_FromString("hello \xf0\x9f\x90\x8d world"));
  ASSERT_EQ(_PyUnicodeWriter_WriteSubstring(&writer, str, 8, 13), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteSubstring(&writer, str, 5, 8), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteSubstring(&writer, str, 0, 5), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "world \xf0\x9f\x90\x8d hello"));
}

TEST_F(UnicodeExtensionApiTest,
       PyUnicodeWriterWriteSubstringWithSubClassWritesSubStringObject) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

str_value = SubStr("hello world")
)");
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  PyObjectPtr str(mainModuleGet("str_value"));
  ASSERT_EQ(_PyUnicodeWriter_WriteSubstring(&writer, str, 0, 5), 0);
  ASSERT_EQ(_PyUnicodeWriter_WriteSubstring(&writer, str, 5, 11), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, "hello world"));
}

TEST_F(UnicodeExtensionApiTest, WriteSubstringWithZeroEndReturnsString) {
  _PyUnicodeWriter writer;
  _PyUnicodeWriter_Init(&writer);
  PyObjectPtr str(PyUnicode_FromString("hello"));
  ASSERT_EQ(_PyUnicodeWriter_WriteSubstring(&writer, str, 0, 0), 0);
  PyObjectPtr unicode(_PyUnicodeWriter_Finish(&writer));

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(unicode, ""));
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8ReturnsString) {
  PyObjectPtr str(PyUnicode_DecodeUTF8("hello world", 11, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world"));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeUTF8WithUnfinishedBytesRaisesUnicodeDecodeError) {
  EXPECT_EQ(PyUnicode_DecodeUTF8("hello world\xC3", 12, nullptr), nullptr);
  PyObject *exc, *value, *tb;
  PyErr_Fetch(&exc, &value, &tb);
  ASSERT_NE(exc, nullptr);
  ASSERT_TRUE(PyErr_GivenExceptionMatches(exc, PyExc_UnicodeDecodeError));
  Py_ssize_t temp;
  PyObjectPtr msg(PyUnicodeDecodeError_GetReason(value));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(msg, "unexpected end of data"));
  PyUnicodeDecodeError_GetStart(value, &temp);
  EXPECT_EQ(temp, 11);
  PyUnicodeDecodeError_GetEnd(value, &temp);
  EXPECT_EQ(temp, 12);
  Py_XDECREF(exc);
  Py_XDECREF(value);
  Py_XDECREF(tb);
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8StatefulReturnsString) {
  Py_ssize_t consumed;
  PyObjectPtr str(
      PyUnicode_DecodeUTF8Stateful("hello world", 11, nullptr, &consumed));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world"));
  EXPECT_EQ(consumed, 11);
}

TEST_F(UnicodeExtensionApiTest,
       DecodeUTF8StatefulWithUnfinishedBytesReturnsString) {
  Py_ssize_t consumed;
  PyObjectPtr str(
      PyUnicode_DecodeUTF8Stateful("hello world\xC3", 12, nullptr, &consumed));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world"));
  EXPECT_EQ(consumed, 11);
}

TEST_F(UnicodeExtensionApiTest, DecodeUnicodeEscapeReturnsString) {
  PyObjectPtr str(
      PyUnicode_DecodeUnicodeEscape("hello \\\nworld", 13, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world"));
}

TEST_F(UnicodeExtensionApiTest, UnderDecodeUnicodeEscapeReturnsFirstInvalid) {
  const char* invalid;
  PyObjectPtr str(
      _PyUnicode_DecodeUnicodeEscape("hello \\yworld", 13, nullptr, &invalid));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello \\yworld"));
  EXPECT_EQ(*invalid, 'y');
}

TEST_F(UnicodeExtensionApiTest,
       UnderDecodeUnicodeEscapeSetsFirstInvalidEscapeToNull) {
  const char* invalid = reinterpret_cast<const char*>(0x100);
  PyObjectPtr result(
      _PyUnicode_DecodeUnicodeEscape("hello", 5, nullptr, &invalid));
  EXPECT_NE(result, nullptr);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ(invalid, nullptr);
}

TEST_F(UnicodeExtensionApiTest, FromFormatWithNoArgsReturnsString) {
  PyObjectPtr str(PyUnicode_FromFormat("hello world"));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world"));
}

TEST_F(UnicodeExtensionApiTest, FromFormatWithManyArgsReturnsString) {
  PyObjectPtr str(PyUnicode_FromFormat("h%c%s%%%2.i", 'e', "llo world", 2));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello world% 2"));
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesNumberTypes) {
  {
    PyObjectPtr str(PyUnicode_FromFormat("%x", 123));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "7b"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%d", 124));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "124"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%i", 125));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "125"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%ld", 126));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "126"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%li", 127));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "127"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%lld", 128));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "128"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%lli", 129));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "129"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%u", 130));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "130"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%lu", 131));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "131"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%llu", 132));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "132"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%zd", 133));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "133"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%zu", 134));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "134"));
  }

  {
    PyObjectPtr str(PyUnicode_FromFormat("%zi", 135));
    EXPECT_TRUE(isUnicodeEqualsCStr(str, "135"));
  }
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesCharacters) {
  PyObjectPtr str(PyUnicode_FromFormat("%c%c", 'h', 'w'));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hw"));
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesPointer) {
  long value = 0;
  void* test = &value;
  char buff[18];
  std::snprintf(buff, 18, "%p", test);
  PyObjectPtr str(PyUnicode_FromFormat("%p", test));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, buff));
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesString) {
  PyObjectPtr str(PyUnicode_FromFormat("%s", "UTF-8"));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "UTF-8"));
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesStringObject) {
  PyObjectPtr unicode(PyUnicode_FromString("hello"));
  PyObjectPtr str(PyUnicode_FromFormat("%U", static_cast<PyObject*>(unicode)));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello"));
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesStringObjectAndString) {
  PyObjectPtr unicode(PyUnicode_FromString("hello"));
  PyObjectPtr str(
      PyUnicode_FromFormat("%V", static_cast<PyObject*>(unicode), "world"));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "hello"));
}

TEST_F(UnicodeExtensionApiTest, FromFormatParsesNullAndString) {
  PyObjectPtr str(PyUnicode_FromFormat("%V", nullptr, "world"));
  EXPECT_TRUE(isUnicodeEqualsCStr(str, "world"));
}

TEST_F(UnicodeExtensionApiTest, ConcatWithNonStringFails) {
  PyObjectPtr i(PyLong_FromLong(1));
  EXPECT_EQ(PyUnicode_Concat(i, i), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, ConcatWithEmptyArgumentReturnsString) {
  PyObjectPtr hello(PyUnicode_FromString("hello"));
  PyObjectPtr empty(PyUnicode_FromString(""));
  PyObjectPtr empty_right(PyUnicode_Concat(hello, empty));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(empty_right, "hello"));

  PyObjectPtr empty_left(PyUnicode_Concat(empty, hello));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(empty_left, "hello"));
}

TEST_F(UnicodeExtensionApiTest, ConcatWithTwoStringsReturnsString) {
  PyObjectPtr hello(PyUnicode_FromString("hello "));
  PyObjectPtr world(PyUnicode_FromString("world"));
  PyObjectPtr result(PyUnicode_Concat(hello, world));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(result, "hello world"));
}

TEST_F(UnicodeExtensionApiTest, AppendWithNullFails) {
  PyUnicode_Append(nullptr, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, AppendWithNonStringFails) {
  PyObject* not_str = PyLong_FromLong(1);
  PyUnicode_Append(&not_str, not_str);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, AppendWithEmptyArgumentReturnsString) {
  PyObject* hello(PyUnicode_FromString("hello"));
  PyObject* empty(PyUnicode_FromString(""));
  PyUnicode_Append(&hello, empty);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(hello, "hello"));

  PyUnicode_Append(&empty, hello);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(empty, "hello"));
  Py_DECREF(hello);
  Py_DECREF(empty);
}

TEST_F(UnicodeExtensionApiTest, AppendWithTwoStringsReturnsString) {
  PyObject* hello = PyUnicode_FromString("hello ");
  PyObjectPtr world(PyUnicode_FromString("world"));
  PyUnicode_Append(&hello, world);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(hello, "hello world"));
  Py_DECREF(hello);
}

TEST_F(UnicodeExtensionApiTest, AppendAndDelWithStringDecreasesRefcnt) {
  PyObject* hello = PyUnicode_FromString("hello ");
  PyObject* world = PyUnicode_FromString("world");
  Py_INCREF(world);
  Py_ssize_t original_refcnt = Py_REFCNT(world);
  PyUnicode_AppendAndDel(&hello, world);

  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(hello, "hello world"));
  Py_DECREF(hello);

  EXPECT_LT(Py_REFCNT(world), original_refcnt);
  Py_DECREF(world);
}

TEST_F(UnicodeExtensionApiTest, EncodeFSDefaultWithNonStringReturnsNull) {
  PyObjectPtr bytes(PyUnicode_EncodeFSDefault(Py_None));
  EXPECT_EQ(bytes, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, EncodeFSDefaultReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  PyObjectPtr bytes(PyUnicode_EncodeFSDefault(unicode));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 3);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo");
}

TEST_F(UnicodeExtensionApiTest, EncodeLocaleWithEmbeddedNulRaisesValueError) {
  PyObjectPtr nul_str(PyUnicode_FromStringAndSize("a\0b", 3));
  PyObject* bytes = PyUnicode_EncodeLocale(nul_str, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(bytes, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest,
       EncodeLocaleWithUnknownErrorHandlerNameRaisesValueError) {
  PyObjectPtr str(PyUnicode_FromStringAndSize("abc", 3));
  PyObject* bytes = PyUnicode_EncodeLocale(str, "nonexistant");
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(bytes, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, EncodeLocaleWithStrReturnsBytes) {
  PyObjectPtr str(PyUnicode_FromStringAndSize("abc", 3));
  PyObjectPtr bytes(PyUnicode_EncodeLocale(str, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_STREQ(PyBytes_AsString(bytes), "abc");
}

TEST_F(UnicodeExtensionApiTest,
       EncodeLocaleWithStrictErrorsAndSurrogatesRaisesError) {
  PyObjectPtr str(PyUnicode_DecodeLocale("abc\x80", "surrogateescape"));
  PyObjectPtr bytes(PyUnicode_EncodeLocale(str, "strict"));
  ASSERT_NE(PyErr_Occurred(), nullptr);
  ASSERT_EQ(bytes, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeEncodeError));
}

TEST_F(UnicodeExtensionApiTest,
       EncodeLocaleWithSurrogateescapeAndSurrogatesReturnsBytes) {
  PyObjectPtr str(PyUnicode_DecodeLocale("abc\x80", "surrogateescape"));
  PyObjectPtr bytes(PyUnicode_EncodeLocale(str, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_STREQ(PyBytes_AsString(bytes), "abc\x80");
}

TEST_F(UnicodeExtensionApiTest, FSConverterWithNullSetAddrToNull) {
  PyObject* result = PyLong_FromLong(1);
  ASSERT_EQ(PyUnicode_FSConverter(nullptr, &result), 1);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ(result, nullptr);
}

TEST_F(UnicodeExtensionApiTest, FSConverterWithBytesReturnsBytes) {
  PyObjectPtr bytes(PyBytes_FromString("foo"));
  PyObject* result = nullptr;
  ASSERT_EQ(PyUnicode_FSConverter(bytes, &result), Py_CLEANUP_SUPPORTED);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyBytes_Check(result));
  Py_DECREF(result);
}

TEST_F(UnicodeExtensionApiTest, FSConverterWithUnicodeReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  PyObject* result = nullptr;
  ASSERT_EQ(PyUnicode_FSConverter(unicode, &result), Py_CLEANUP_SUPPORTED);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyBytes_Check(result));
  Py_DECREF(result);
}

TEST_F(UnicodeExtensionApiTest, FSConverterCallsDunderFspath) {
  PyRun_SimpleString(R"(
class C:
  def __fspath__(self):
    return "foo"

foo = C()
)");
  PyObjectPtr path(mainModuleGet("foo"));
  PyObject* result = nullptr;
  ASSERT_EQ(PyUnicode_FSConverter(path, &result), Py_CLEANUP_SUPPORTED);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyBytes_Check(result));
  Py_DECREF(result);
}

TEST_F(UnicodeExtensionApiTest, FSConverterWithBytesSubclassReturnsSubclass) {
  PyRun_SimpleString(R"(
class C(bytes):
  pass

foo = C()
)");
  PyObjectPtr path(mainModuleGet("foo"));
  PyObject* result = nullptr;
  ASSERT_EQ(PyUnicode_FSConverter(path, &result), Py_CLEANUP_SUPPORTED);
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyBytes_Check(result));
  EXPECT_EQ(result, path);
  Py_DECREF(result);
}

TEST_F(UnicodeExtensionApiTest, FSConverterWithEmbeddedNullRaisesValueError) {
  PyObjectPtr bytes(PyBytes_FromStringAndSize("foo \0 bar", 9));
  PyObject* result = nullptr;
  ASSERT_EQ(PyUnicode_FSConverter(bytes, &result), 0);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  ASSERT_EQ(result, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, InternInPlaceWritesNewHandleBack) {
  PyObject* a = PyUnicode_FromString("hello world aaaaaaaaaa");
  PyObject* b = PyUnicode_FromString("hello world aaaaaaaaaa");
  PyObject* b_addr = b;
  EXPECT_NE(a, b);
  PyUnicode_InternInPlace(&a);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  PyUnicode_InternInPlace(&b);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_NE(b, b_addr);
  Py_DECREF(a);
  Py_DECREF(b);
}

TEST_F(UnicodeExtensionApiTest, InternFromStringReturnsStr) {
  PyObjectPtr result(PyUnicode_InternFromString("szechuan broccoli"));
  ASSERT_NE(result, nullptr);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyUnicode_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, JoinWithEmptySeqReturnsEmptyStr) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr seq(PyList_New(0));
  PyObjectPtr result(PyUnicode_Join(sep, seq));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(result, ""));
}

TEST_F(UnicodeExtensionApiTest, JoinWithSeqJoinsElements) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr seq(PyList_New(0));
  PyObjectPtr elt0(PyUnicode_FromString("a"));
  PyList_Append(seq, elt0);
  PyObjectPtr elt1(PyUnicode_FromString("b"));
  PyList_Append(seq, elt1);
  PyObjectPtr result(PyUnicode_Join(sep, seq));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(isUnicodeEqualsCStr(result, "a.b"));
}

TEST_F(UnicodeExtensionApiTest, JoinWithSeqContainingNonStrRaisesTypeError) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr seq(PyList_New(0));
  PyList_Append(seq, Py_None);
  PyObjectPtr result(PyUnicode_Join(sep, seq));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, JoinWithSeqContainingBytesRaisesTypeError) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr seq(PyList_New(0));
  PyObjectPtr elt0(PyBytes_FromString("a"));
  PyList_Append(seq, elt0);
  PyObjectPtr result(PyUnicode_Join(sep, seq));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, PartitionWithNonStrStrRaisesTypeError) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_Partition(Py_None, sep));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, PartitionWithNonStrSepRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("hello"));
  PyObjectPtr result(PyUnicode_Partition(str, Py_None));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, PartitionReturnsTuple) {
  PyObjectPtr str(PyUnicode_FromString("a.b"));
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_Partition(str, sep));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyTuple_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, RPartitionWithNonStrStrRaisesTypeError) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_RPartition(Py_None, sep));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, RPartitionWithNonStrSepRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("hello"));
  PyObjectPtr result(PyUnicode_RPartition(str, Py_None));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, RPartitionReturnsTuple) {
  PyObjectPtr str(PyUnicode_FromString("a.b"));
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_RPartition(str, sep));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyTuple_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, SplitlinesWithNonStrStrRaisesTypeError) {
  PyObjectPtr result(PyUnicode_Splitlines(Py_None, 0));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, SplitlinesReturnsList) {
  PyObjectPtr str(PyUnicode_FromString("hello\nworld"));
  PyObjectPtr result(PyUnicode_Splitlines(str, 1));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyList_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, SplitlinesWithSubClassReturnsList) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

str_val = SubStr('hello\nworld')
)");
  PyObjectPtr str(mainModuleGet("str_val"));
  PyObjectPtr result(PyUnicode_Splitlines(str, 1));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyList_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, SplitlinesWithNoNewlinesReturnsIdEqualString) {
  PyObjectPtr str(PyUnicode_FromString("hello"));
  PyObjectPtr result(PyUnicode_Splitlines(str, 1));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  ASSERT_TRUE(PyList_CheckExact(result));
  ASSERT_EQ(PyList_Size(result), 1);
  PyObject* str_elt = PyList_GetItem(result, 0);
  EXPECT_EQ(str, str_elt);
}

TEST_F(UnicodeExtensionApiTest, SplitWithNonStrStrRaisesTypeError) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_Split(Py_None, sep, 5));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, SplitWithNonStrSepRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("hello"));
  PyObjectPtr sep(PyLong_FromLong(8));
  PyObjectPtr result(PyUnicode_Split(str, sep, 5));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, SplitReturnsList) {
  PyObjectPtr str(PyUnicode_FromString("a.b"));
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_Split(str, sep, 5));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyList_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, RSplitWithNonStrStrRaisesTypeError) {
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_RSplit(Py_None, sep, 5));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, RSplitWithNonStrSepRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("hello"));
  PyObjectPtr sep(PyLong_FromLong(8));
  PyObjectPtr result(PyUnicode_RSplit(str, sep, 5));
  EXPECT_EQ(result, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, RSplitReturnsList) {
  PyObjectPtr str(PyUnicode_FromString("a.b"));
  PyObjectPtr sep(PyUnicode_FromString("."));
  PyObjectPtr result(PyUnicode_RSplit(str, sep, 5));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_NE(result, nullptr);
  EXPECT_TRUE(PyList_CheckExact(result));
}

TEST_F(UnicodeExtensionApiTest, StrlenWithEmptyStrReturnsZero) {
  const wchar_t* str = L"";
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  ASSERT_EQ(Py_UNICODE_strlen(str), 0U);
#pragma GCC diagnostic pop
}

TEST_F(UnicodeExtensionApiTest, StrlenWithStrReturnsNumberOfChars) {
  const wchar_t* str = L"hello";
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  ASSERT_EQ(Py_UNICODE_strlen(str), 5U);
#pragma GCC diagnostic pop
}

TEST_F(UnicodeExtensionApiTest, SubstringWithNegativeStartRaisesIndexError) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  ASSERT_EQ(PyUnicode_Substring(str, -1, 3), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_IndexError));
}

TEST_F(UnicodeExtensionApiTest, SubstringWithNegativeEndRaisesIndexError) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  ASSERT_EQ(PyUnicode_Substring(str, 0, -3), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_IndexError));
}

TEST_F(UnicodeExtensionApiTest, SubstringWithFullStringReturnsSameObject) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  PyObjectPtr result(PyUnicode_Substring(str, 0, 5));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_EQ(result, str);
}

TEST_F(UnicodeExtensionApiTest, SubstringWithSameStartAndEndReturnsEmpty) {
  PyObjectPtr str(PyUnicode_FromString("foo"));
  PyObjectPtr result(PyUnicode_Substring(str, 2, 2));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(result));
  EXPECT_STREQ(PyUnicode_AsUTF8(result), "");
}

TEST_F(UnicodeExtensionApiTest, SubstringWithASCIIReturnsSubstring) {
  PyObjectPtr str(PyUnicode_FromString("Hello world!"));
  PyObjectPtr result(PyUnicode_Substring(str, 3, 8));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(result));
  EXPECT_STREQ(PyUnicode_AsUTF8(result), "lo wo");
}

TEST_F(UnicodeExtensionApiTest, SubstringWithSubClassReturnsSubstring) {
  PyRun_SimpleString(R"(
class SubStr(str): pass

str_val = SubStr('Hello world!')
)");
  PyObjectPtr str(mainModuleGet("str_val"));
  PyObjectPtr result(PyUnicode_Substring(str, 3, 8));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(result));
  EXPECT_STREQ(PyUnicode_AsUTF8(result), "lo wo");
}

TEST_F(UnicodeExtensionApiTest, SubstringCountsCodePoints) {
  PyObjectPtr str(PyUnicode_FromString("cre\u0300me bru\u0302le\u0301e"));
  PyObjectPtr result(PyUnicode_Substring(str, 2, 11));
  EXPECT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(result));
  EXPECT_STREQ(PyUnicode_AsUTF8(result), "e\u0300me bru\u0302");
}

TEST_F(UnicodeExtensionApiTest, TailmatchSuffixWithEmptyStringsReturnsOne) {
  PyObjectPtr str(PyUnicode_FromString(""));
  PyObjectPtr substr(PyUnicode_FromString(""));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 0, 0, 1), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchPrefixWithEmptyStringsReturnsOne) {
  PyObjectPtr str(PyUnicode_FromString(""));
  PyObjectPtr substr(PyUnicode_FromString(""));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 0, 0, -1), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchPrefixWithMatchReturnsOne) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr substr(PyUnicode_FromString("cde"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 2, 9, -1), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchPrefixWithoutMatchReturnsZero) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr substr(PyUnicode_FromString("cde"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 2, 4, -1), 0);
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 1, 6, -1), 0);

  PyObjectPtr substr2(PyUnicode_FromString("cdf"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr2, 2, 6, -1), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchSuffixWithMatchReturnsOne) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr substr(PyUnicode_FromString("cde"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 1, 5, 1), 1);
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 1, 6, 1), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchSuffixWithoutMatchReturnsZero) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr substr(PyUnicode_FromString("cde"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 3, 5, 1), 0);
  PyObjectPtr substr2(PyUnicode_FromString("bde"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr2, 1, 5, 1), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchWithLargerNeedleReturnsZero) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr substr(PyUnicode_FromString("bananas"));
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 3, 5, 1), 0);
  EXPECT_EQ(PyUnicode_Tailmatch(str, substr, 3, 5, -1), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, TailmatchWithNonStrHaystackRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr num(PyLong_FromLong(7));
  EXPECT_EQ(PyUnicode_Tailmatch(num, str, 1, 6, 1), -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, TailmatchWithNonStrNeedleRaisesTypeError) {
  PyObjectPtr str(PyUnicode_FromString("abcde"));
  PyObjectPtr num(PyLong_FromLong(7));
  EXPECT_EQ(PyUnicode_Tailmatch(str, num, 1, 6, 1), -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, NewWithInvalidSizeReturnsError) {
  EXPECT_EQ(PyUnicode_New(-1, 0), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, NewWithInvalidMaxCharReturnsError) {
  EXPECT_EQ(PyUnicode_New(1, 0x11FFFF), nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest, NewWithZeroSizeAndInvalidMaxCharReturnsStr) {
  PyObjectPtr empty(PyUnicode_New(0, 0x11FFFF));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyUnicode_CheckExact(empty));
  EXPECT_TRUE(isUnicodeEqualsCStr(empty, ""));
}

TEST_F(UnicodeExtensionApiTest, FromKindAndDataWithNegativeOneRaiseError) {
  char c = 'a';
  PyObjectPtr empty(PyUnicode_FromKindAndData(PyUnicode_1BYTE_KIND, &c, -1));
  EXPECT_EQ(empty, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, FromKindAndDataWithInvalidKindRaiseError) {
  char c = 'a';
  PyObjectPtr empty(PyUnicode_FromKindAndData(100, &c, 1));
  EXPECT_EQ(empty, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_SystemError));
}

TEST_F(UnicodeExtensionApiTest,
       FromKindAndDataWithOneByteKindAndASCIICodePointsReturnsStr) {
  Py_UCS1 buffer[] = {'h', 'e', 'l', 'l', 'o'};
  PyObjectPtr str(PyUnicode_FromKindAndData(PyUnicode_1BYTE_KIND, buffer,
                                            Py_ARRAY_LENGTH(buffer)));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(str, "hello"));
}

TEST_F(UnicodeExtensionApiTest,
       FromKindAndDataWithOneByteKindAndLatin1CodePointsReturnsStr) {
  Py_UCS1 buffer[] = {'h', 0xe4, 'l', 'l', 'o'};
  PyObjectPtr str(PyUnicode_FromKindAndData(PyUnicode_1BYTE_KIND, buffer,
                                            Py_ARRAY_LENGTH(buffer)));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_STREQ(PyUnicode_AsUTF8(str), "h\xc3\xa4llo");
}

TEST_F(UnicodeExtensionApiTest,
       FromKindAndDataWithTwoByteKindAndBMPCodePointsReturnsStr) {
  Py_UCS2 buffer[] = {'h', 0xe4, 'l', 0x2cc0, 'o'};
  PyObjectPtr str(PyUnicode_FromKindAndData(PyUnicode_2BYTE_KIND, buffer,
                                            Py_ARRAY_LENGTH(buffer)));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_STREQ(PyUnicode_AsUTF8(str), "h\xc3\xa4l\xe2\xb3\x80o");
}

TEST_F(UnicodeExtensionApiTest,
       FromKindAndDataWithFourByteKindAndNonBMPCodePointsReturnsStr) {
  Py_UCS4 buffer[] = {0x1f192, 'h', 0xe4, 'l', 0x2cc0};
  PyObjectPtr str(PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND, buffer,
                                            Py_ARRAY_LENGTH(buffer)));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_STREQ(PyUnicode_AsUTF8(str), "\xf0\x9f\x86\x92h\xc3\xa4l\xe2\xb3\x80");
}

TEST_F(UnicodeExtensionApiTest, ContainsWithNonStrSelfRaisesTypeError) {
  PyObjectPtr self(PyLong_FromLong(7));
  PyObjectPtr other(PyUnicode_FromString("hello"));
  EXPECT_EQ(PyUnicode_Contains(self, other), -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, ContainsWithNonStrOtherRaisesTypeError) {
  PyObjectPtr self(PyUnicode_FromString("hello"));
  PyObjectPtr other(PyLong_FromLong(7));
  EXPECT_EQ(PyUnicode_Contains(self, other), -1);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, ContainsWithPresentSubstrReturnsTrue) {
  PyObjectPtr self(PyUnicode_FromString("foo"));
  PyObjectPtr other(PyUnicode_FromString("f"));
  EXPECT_EQ(PyUnicode_Contains(self, other), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, ContainsWithNotPresentSubstrReturnsTrue) {
  PyObjectPtr self(PyUnicode_FromString("foo"));
  PyObjectPtr other(PyUnicode_FromString("q"));
  EXPECT_EQ(PyUnicode_Contains(self, other), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, NormalizeEncodingEscapesMidStringPunctuation) {
  char buffer[11] = {0};
  EXPECT_EQ(_Py_normalize_encoding("utf-8", buffer, sizeof(buffer)), 1);
  EXPECT_STREQ(buffer, "utf_8");
  EXPECT_EQ(_Py_normalize_encoding("utf}8", buffer, sizeof(buffer)), 1);
  EXPECT_STREQ(buffer, "utf_8");
}

TEST_F(UnicodeExtensionApiTest,
       NormalizeEncodingIgnoresEndOfStringPunctuation) {
  char buffer[11] = {0};
  EXPECT_EQ(_Py_normalize_encoding("_utf8", buffer, sizeof(buffer)), 1);
  EXPECT_STREQ(buffer, "utf8");
  EXPECT_EQ(_Py_normalize_encoding("utf8_", buffer, sizeof(buffer)), 1);
  EXPECT_STREQ(buffer, "utf8");
}

TEST_F(UnicodeExtensionApiTest, NormalizeEncodingProperlyLowercases) {
  char buffer[11] = {0};
  EXPECT_EQ(_Py_normalize_encoding("ASCII", buffer, sizeof(buffer)), 1);
  EXPECT_STREQ(buffer, "ascii");
}

TEST_F(UnicodeExtensionApiTest,
       NormalizeEncodingWithTooLongStringReturnsEmptyString) {
  char buffer[5] = {0};
  EXPECT_EQ(_Py_normalize_encoding("12345", buffer, sizeof(buffer)), 0);
  EXPECT_STREQ(buffer, "1234");
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithNullErrorValueEmbeddedNulRaisesValueError) {
  PyObject* self = PyUnicode_DecodeLocaleAndSize("a\0b", 3, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(self, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(
    UnicodeExtensionApiTest,
    DecodeLocaleAndSizeWithNullErrorValueNonNulTerminatedStrRaisesValueError) {
  const char data[] = {'a', 'b'};
  PyObject* self = PyUnicode_DecodeLocaleAndSize(data, 1, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(self, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithNullErrorValueReturnsStr) {
  PyObjectPtr str(PyUnicode_DecodeLocaleAndSize("abc", 3, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(str, "abc"));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithNullErrorValueStrictAndSurrogatesRaisesError) {
  PyObject* str = PyUnicode_DecodeLocaleAndSize("abc\x80", 4, nullptr);
  ASSERT_EQ(str, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeDecodeError));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithEmbeddedNulRaisesValueError) {
  PyObject* self = PyUnicode_DecodeLocaleAndSize("a\0b", 3, "strict");
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(self, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithNonNulTerminatedStrRaisesValueError) {
  const char data[] = {'a', 'b'};
  PyObject* self = PyUnicode_DecodeLocaleAndSize(data, 1, "strict");
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(self, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithUnknownErrorHandlerNameRaisesValueError) {
  PyObject* self = PyUnicode_DecodeLocaleAndSize("abc", 3, "nonexistant");
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_EQ(self, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_ValueError));
}

TEST_F(UnicodeExtensionApiTest, DecodeLocaleAndSizeWithStrictReturnsStr) {
  PyObjectPtr str(PyUnicode_DecodeLocaleAndSize("abc", 3, "strict"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(str, "abc"));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithSurrogateescapeReturnsStr) {
  PyObjectPtr str(PyUnicode_DecodeLocaleAndSize("abc", 3, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  EXPECT_TRUE(_PyUnicode_EqualToASCIIString(str, "abc"));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithSurrogateescapeAndSurrogatesReturnsStr) {
  PyObjectPtr str(
      PyUnicode_DecodeLocaleAndSize("abc\x80", 4, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(str));
  Py_UCS4 data[] = {'a', 'b', 'c', 0xDC80};
  PyObjectPtr test(PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND, data, 4));
  EXPECT_TRUE(_PyUnicode_EQ(str, test));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeLocaleAndSizeWithStrictAndSurrogatesRaisesError) {
  PyObject* str = PyUnicode_DecodeLocaleAndSize("abc\x80", 4, "strict");
  ASSERT_EQ(str, nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeDecodeError));
}

TEST_F(UnicodeExtensionApiTest, AsASCIIStringWithNonStringReturnsNull) {
  PyObjectPtr bytes(_PyUnicode_AsASCIIString(Py_None, nullptr));
  ASSERT_EQ(bytes, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, AsASCIIStringReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  PyObjectPtr bytes(_PyUnicode_AsASCIIString(unicode, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 3);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo");
}

TEST_F(UnicodeExtensionApiTest,
       AsASCIIStringWithInvalidCodepointRaisesEncodeError) {
  PyObjectPtr unicode(PyUnicode_FromString("foo\u00EF"));
  PyObjectPtr bytes(_PyUnicode_AsASCIIString(unicode, nullptr));
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeEncodeError));
  EXPECT_EQ(bytes, nullptr);
}

TEST_F(UnicodeExtensionApiTest, AsASCIIStringWithReplaceErrorsReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo\u00EF"));
  PyObjectPtr bytes(_PyUnicode_AsASCIIString(unicode, "replace"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 4);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo?");
}

TEST_F(UnicodeExtensionApiTest, AsLatin1StringWithNonStringReturnsNull) {
  PyObjectPtr bytes(_PyUnicode_AsLatin1String(Py_None, nullptr));
  ASSERT_EQ(bytes, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, AsLatin1StringReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  PyObjectPtr bytes(_PyUnicode_AsLatin1String(unicode, nullptr));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 3);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo");
}

TEST_F(UnicodeExtensionApiTest, AsLatin1StringWithLatin1ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo\u00E4"));
  PyObjectPtr bytes(_PyUnicode_AsLatin1String(unicode, "replace"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 4);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo\xE4");
}

TEST_F(UnicodeExtensionApiTest,
       AsLatin1StringWithInvalidCodepointRaisesEncodeError) {
  PyObjectPtr unicode(PyUnicode_FromString("foo\u01EF"));
  PyObjectPtr bytes(_PyUnicode_AsLatin1String(unicode, nullptr));
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeEncodeError));
  EXPECT_EQ(bytes, nullptr);
}

TEST_F(UnicodeExtensionApiTest, AsLatin1StringWithReplaceErrorsReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("foo\u0AE4"));
  PyObjectPtr bytes(_PyUnicode_AsLatin1String(unicode, "replace"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 4);
  EXPECT_STREQ(PyBytes_AsString(bytes), "foo?");
}

TEST_F(UnicodeExtensionApiTest, AsUTF16StringWithNonStringReturnsNull) {
  PyObjectPtr bytes(PyUnicode_AsUTF16String(Py_None));
  ASSERT_EQ(bytes, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, AsUTF16StringReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("hi"));
  PyObjectPtr bytes(PyUnicode_AsUTF16String(unicode));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 6);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes), "\xff\xfeh\x00i\x00", 6), 0);
}

TEST_F(UnicodeExtensionApiTest,
       AsUTF16StringWithInvalidCodepointRaisesEncodeError) {
  PyObjectPtr unicode(PyUnicode_DecodeASCII("h\x80i", 3, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(unicode));
  PyObjectPtr bytes(PyUnicode_AsUTF16String(unicode));
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeEncodeError));
  EXPECT_EQ(bytes, nullptr);
}

TEST_F(UnicodeExtensionApiTest, AsUTF16StringWithUTF16ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(PyUnicode_AsUTF16String(unicode));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 10);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes),
                        "\xff\xfeh\x00\x34\xd8\xf0\xddi\x00", 10),
            0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF16WithUTF16ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF16(unicode, "replace", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 10);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes),
                        "\xff\xfeh\x00\x34\xd8\xf0\xddi\x00", 10),
            0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF16LeWithUTF16ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF16(unicode, "replace", -1));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 8);
  EXPECT_EQ(
      std::memcmp(PyBytes_AsString(bytes), "h\x00\x34\xd8\xf0\xddi\x00", 8), 0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF16BeWithUTF16ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF16(unicode, "replace", 1));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 8);
  EXPECT_EQ(
      std::memcmp(PyBytes_AsString(bytes), "\x00h\xd8\x34\xdd\xf0\x00i", 8), 0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF16WithReplaceReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_DecodeASCII("h\x80i", 3, "surrogateescape"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF16(unicode, "replace", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 8);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes), "\xff\xfeh\x00?\x00i\x00", 8),
            0);
}

TEST_F(UnicodeExtensionApiTest, EncodeUTF16WithReplaceReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromWideChar(L"h\xDC80i", 3));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF16(unicode, "replace", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 8);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes), "\xff\xfeh\x00?\x00i\x00", 8),
            0);
}

TEST_F(UnicodeExtensionApiTest, AsUTF32StringWithNonStringReturnsNull) {
  PyObjectPtr bytes(PyUnicode_AsUTF32String(Py_None));
  ASSERT_EQ(bytes, nullptr);
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_TypeError));
}

TEST_F(UnicodeExtensionApiTest, AsUTF32StringReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("hi"));
  PyObjectPtr bytes(PyUnicode_AsUTF32String(unicode));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 12);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes),
                        "\xff\xfe\x00\x00h\x00\x00\x00i\x00\x00\x00", 12),
            0);
}

TEST_F(UnicodeExtensionApiTest,
       AsUTF32StringWithInvalidCodepointRaisesEncodeError) {
  PyObjectPtr unicode(PyUnicode_DecodeASCII("h\x80i", 3, "surrogateescape"));
  ASSERT_EQ(PyErr_Occurred(), nullptr);
  ASSERT_TRUE(PyUnicode_CheckExact(unicode));
  PyObjectPtr bytes(PyUnicode_AsUTF32String(unicode));
  ASSERT_NE(PyErr_Occurred(), nullptr);
  EXPECT_TRUE(PyErr_ExceptionMatches(PyExc_UnicodeEncodeError));
  EXPECT_EQ(bytes, nullptr);
}

TEST_F(UnicodeExtensionApiTest, AsUTF32StringWithUTF32ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(PyUnicode_AsUTF32String(unicode));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 16);
  EXPECT_EQ(
      std::memcmp(PyBytes_AsString(bytes),
                  "\xff\xfe\x00\x00h\x00\x00\x00\xf0\xd1\x01\x00i\x00\x00\x00",
                  16),
      0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF32WithUTF32ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF32(unicode, "replace", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 16);
  EXPECT_EQ(
      std::memcmp(PyBytes_AsString(bytes),
                  "\xff\xfe\x00\x00h\x00\x00\x00\xf0\xd1\x01\x00i\x00\x00\x00",
                  16),
      0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF32LeWithUTF32ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF32(unicode, "replace", -1));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 12);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes),
                        "h\x00\x00\x00\xf0\xd1\x01\x00i\x00\x00\x00", 12),
            0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF32BeWithUTF32ReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromString("h\U0001d1f0i"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF32(unicode, "replace", 1));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 12);
  EXPECT_EQ(std::memcmp(PyBytes_AsString(bytes),
                        "\x00\x00\x00h\x00\x01\xd1\xf0\x00\x00\x00i", 12),
            0);
}

TEST_F(UnicodeExtensionApiTest, UnderEncodeUTF32WithReplaceReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_DecodeASCII("h\x80i", 3, "surrogateescape"));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF32(unicode, "replace", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 16);
  EXPECT_EQ(std::memcmp(
                PyBytes_AsString(bytes),
                "\xff\xfe\x00\x00h\x00\x00\x00?\x00\x00\x00i\x00\x00\x00", 16),
            0);
}

TEST_F(UnicodeExtensionApiTest, EncodeUTF32WithReplaceReturnsBytes) {
  PyObjectPtr unicode(PyUnicode_FromWideChar(L"h\xDC80i", 3));
  PyObjectPtr bytes(_PyUnicode_EncodeUTF32(unicode, "replace", 0));
  ASSERT_EQ(PyErr_Occurred(), nullptr);

  ASSERT_TRUE(PyBytes_Check(bytes));
  EXPECT_EQ(PyBytes_Size(bytes), 16);
  EXPECT_EQ(std::memcmp(
                PyBytes_AsString(bytes),
                "\xff\xfe\x00\x00h\x00\x00\x00?\x00\x00\x00i\x00\x00\x00", 16),
            0);
}

TEST_F(UnicodeExtensionApiTest, IsAsciiWithAsciiOnlyCharsReturnsOne) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  EXPECT_EQ(PyUnicode_IS_ASCII(unicode.get()), 1);
}

TEST_F(UnicodeExtensionApiTest, IsAsciiWithNonAsciiCharsReturnsZero) {
  PyObjectPtr unicode(PyUnicode_FromString("fo\u00e4o"));
  EXPECT_EQ(PyUnicode_IS_ASCII(unicode.get()), 0);
}

TEST_F(UnicodeExtensionApiTest, IsCompactAsciiWithAsciiOnlyCharsReturnsOne) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  EXPECT_EQ(PyUnicode_IS_COMPACT_ASCII(unicode.get()), 1);
}

TEST_F(UnicodeExtensionApiTest, IsCompactAsciiWithNonAsciiCharsReturnsZero) {
  PyObjectPtr unicode(PyUnicode_FromString("fo\u00e4o"));
  EXPECT_EQ(PyUnicode_IS_COMPACT_ASCII(unicode.get()), 0);
}

TEST_F(UnicodeExtensionApiTest, IsIdentifierWithEmptyStringReturnsFalse) {
  PyObjectPtr unicode(PyUnicode_FromString(""));
  EXPECT_EQ(PyUnicode_IsIdentifier(unicode), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, IsIdentifierWithValidIdentifierReturnsTrue) {
  PyObjectPtr unicode(PyUnicode_FromString("foo"));
  EXPECT_EQ(PyUnicode_IsIdentifier(unicode), 1);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, IsIdentifierWithInvalidIdentifierReturnsFalse) {
  PyObjectPtr unicode(PyUnicode_FromString("b$ar"));
  EXPECT_EQ(PyUnicode_IsIdentifier(unicode), 0);
  EXPECT_EQ(PyErr_Occurred(), nullptr);
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8ExWithEmptyStrReturnsZero) {
  const char* str = "";
  wchar_t* result = nullptr;
  EXPECT_EQ(0, _Py_DecodeUTF8Ex(str, /*size=*/0, /*result=*/&result,
                                /*wlen=*/nullptr,
                                /*reason=*/nullptr, _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, L"");
  PyMem_RawFree(result);
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8ExWithASCIIStrReturnsZero) {
  const char* str = "hello";
  wchar_t* result = nullptr;
  EXPECT_EQ(0,
            _Py_DecodeUTF8Ex(str, /*size=*/std::strlen(str), /*result=*/&result,
                             /*wlen=*/nullptr,
                             /*reason=*/nullptr, _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_EQ(std::wcslen(result), size_t{5});
  EXPECT_EQ('h', result[0]);
  EXPECT_EQ('e', result[1]);
  EXPECT_EQ('l', result[2]);
  EXPECT_EQ('l', result[3]);
  EXPECT_EQ('o', result[4]);
  PyMem_RawFree(result);
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8ExDecodesUpToSizeBytes) {
  const char* str = "hello";
  wchar_t* result = nullptr;
  EXPECT_EQ(0, _Py_DecodeUTF8Ex(str, /*size=*/3, /*result=*/&result,
                                /*wlen=*/nullptr,
                                /*reason=*/nullptr, _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_EQ(std::wcslen(result), size_t{3});
  EXPECT_EQ('h', result[0]);
  EXPECT_EQ('e', result[1]);
  EXPECT_EQ('l', result[2]);
  PyMem_RawFree(result);
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8ExWithASCIIStrSetsWlen) {
  const char* str = "hello";
  wchar_t* result = nullptr;
  size_t wlen = 0;
  EXPECT_EQ(0,
            _Py_DecodeUTF8Ex(str, /*size=*/std::strlen(str), /*result=*/&result,
                             /*wlen=*/&wlen,
                             /*reason=*/nullptr, _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_EQ(std::wcslen(result), size_t{5});
  EXPECT_EQ('h', result[0]);
  EXPECT_EQ('e', result[1]);
  EXPECT_EQ('l', result[2]);
  EXPECT_EQ('l', result[3]);
  EXPECT_EQ('o', result[4]);
  EXPECT_EQ(wlen, size_t{5});
  PyMem_RawFree(result);
}

TEST_F(UnicodeExtensionApiTest, EncodeUTF8ExWithEmptyStrReturnsZero) {
  const wchar_t* str = L"";
  char* result = nullptr;
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/nullptr,
                                /*reason=*/nullptr, /*raw_malloc=*/0,
                                _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, "");
  PyMem_Free(result);
}

TEST_F(UnicodeExtensionApiTest, EncodeUTF8ExWithASCIIStrReturnsZero) {
  const wchar_t* str = L"hello";
  char* result = nullptr;
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/nullptr,
                                /*reason=*/nullptr, /*raw_malloc=*/0,
                                _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, "hello");
  PyMem_Free(result);
}

TEST_F(UnicodeExtensionApiTest, EncodeUTF8ExWithRawMallocReturnsZero) {
  const wchar_t* str = L"hello";
  char* result = nullptr;
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/nullptr,
                                /*reason=*/nullptr, /*raw_malloc=*/1,
                                _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, "hello");
  PyMem_RawFree(result);
}

TEST_F(UnicodeExtensionApiTest, EncodeUTF8ExWithLatin1ReturnsZero) {
  const wchar_t* str = L"cr\xe8me br\xfbl\xe9e";
  char* result = nullptr;
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/nullptr,
                                /*reason=*/nullptr, /*raw_malloc=*/0,
                                _Py_ERROR_STRICT));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, u8"cr\xC3\xA8me br\xC3\xBBl\xE0\xBA\x9E");
  PyMem_Free(result);
}

TEST_F(UnicodeExtensionApiTest,
       EncodeUTF8ExWithoutSurrogateEscapeReturnsNegativeTwo) {
  const wchar_t* str = L"\x0000dc80";
  char* result = reinterpret_cast<char*>(0xdeadbeef);
  EXPECT_EQ(-2, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/nullptr,
                                 /*reason=*/nullptr, /*raw_malloc=*/0,
                                 _Py_ERROR_STRICT));
  EXPECT_EQ(result, reinterpret_cast<char*>(0xdeadbeef));
}

TEST_F(UnicodeExtensionApiTest,
       EncodeUTF8ExWithoutSurrogateEscapeAndErrorPosSetsErrorPos) {
  const wchar_t* str = L"foo\x0000dc80zip";
  char* result = reinterpret_cast<char*>(0xdeadbeef);
  size_t error_pos = 1337;
  EXPECT_EQ(-2, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/&error_pos,
                                 /*reason=*/nullptr, /*raw_malloc=*/0,
                                 _Py_ERROR_STRICT));
  EXPECT_EQ(result, reinterpret_cast<char*>(0xdeadbeef));
  EXPECT_EQ(error_pos, size_t{3});
}

TEST_F(UnicodeExtensionApiTest,
       EncodeUTF8ExWithoutSurrogateEscapeAndReasonSetsReason) {
  const wchar_t* str = L"\x0000dc80";
  char* result = reinterpret_cast<char*>(0xdeadbeef);
  const char* reason = nullptr;
  EXPECT_EQ(-2, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/nullptr,
                                 /*reason=*/&reason, /*raw_malloc=*/0,
                                 _Py_ERROR_STRICT));
  EXPECT_EQ(result, reinterpret_cast<char*>(0xdeadbeef));
  ASSERT_NE(reason, nullptr);
  EXPECT_STREQ(reason, "encoding error");
}

TEST_F(UnicodeExtensionApiTest,
       EncodeUTF8ExWithSurrogateEscapeEscapesSurrogate) {
  const wchar_t* str = L"\x0000dc80";
  char* result = nullptr;
  size_t error_pos = 1337;
  const char* reason = const_cast<const char*>(reinterpret_cast<char*>(0x1337));
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/&error_pos,
                                /*reason=*/&reason, /*raw_malloc=*/0,
                                _Py_ERROR_SURROGATEESCAPE));
  EXPECT_EQ(error_pos, size_t{1337});
  EXPECT_EQ(reason, reinterpret_cast<char*>(0x1337));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, u8"\x80");
  PyMem_Free(result);
}

TEST_F(UnicodeExtensionApiTest,
       EncodeUTF8ExWithThreeByteCodePointEncodesCodePoint) {
  const wchar_t* str = L"\x0000efff";
  char* result = nullptr;
  size_t error_pos = 1337;
  const char* reason = const_cast<const char*>(reinterpret_cast<char*>(0x1337));
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/&error_pos,
                                /*reason=*/nullptr, /*raw_malloc=*/0,
                                _Py_ERROR_SURROGATEESCAPE));
  EXPECT_EQ(error_pos, size_t{1337});
  EXPECT_EQ(reason, reinterpret_cast<char*>(0x1337));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, u8"\xee\xbf\xbf");
  PyMem_Free(result);
}

TEST_F(UnicodeExtensionApiTest,
       EncodeUTF8ExWithFourByteCodePointEncodesCodePoint) {
  const wchar_t* str = L"\x10000";
  char* result = nullptr;
  size_t error_pos = 1337;
  const char* reason = const_cast<const char*>(reinterpret_cast<char*>(0x1337));
  EXPECT_EQ(0, _Py_EncodeUTF8Ex(str, &result, /*error_pos=*/&error_pos,
                                /*reason=*/nullptr, /*raw_malloc=*/0,
                                _Py_ERROR_SURROGATEESCAPE));
  EXPECT_EQ(error_pos, size_t{1337});
  EXPECT_EQ(reason, reinterpret_cast<char*>(0x1337));
  ASSERT_NE(result, nullptr);
  EXPECT_STREQ(result, u8"\xf0\x90\x80\x80");
  PyMem_Free(result);
}

TEST_F(UnicodeExtensionApiTest,
       FileSystemDefaultEncodeErrorsMatchesSysGetfilesystemencodeerrors) {
  PyRun_SimpleString(R"(
import sys
errors = sys.getfilesystemencodeerrors()
)");
  PyObjectPtr errors(mainModuleGet("errors"));
  EXPECT_TRUE(isUnicodeEqualsCStr(errors, Py_FileSystemDefaultEncodeErrors));
}

TEST_F(UnicodeExtensionApiTest,
       FileSystemDefaultEncodingMatchesSysGetfilesystemencoding) {
  PyRun_SimpleString(R"(
import sys
encoding = sys.getfilesystemencoding()
)");
  PyObjectPtr errors(mainModuleGet("encoding"));
  EXPECT_TRUE(isUnicodeEqualsCStr(errors, Py_FileSystemDefaultEncoding));
}

TEST_F(UnicodeExtensionApiTest,
       GetDefaultEncodingMatchesSysGetdefaultencoding) {
  PyRun_SimpleString(R"(
import sys
sys_default = sys.getdefaultencoding()
)");
  PyObjectPtr sys_default(mainModuleGet("sys_default"));
  EXPECT_TRUE(isUnicodeEqualsCStr(sys_default, PyUnicode_GetDefaultEncoding()));
}

TEST_F(UnicodeExtensionApiTest,
       DecodeUTF8SurrogateEscapeWithEmptyStringReturnsEmptyString) {
  size_t wlen;
  wchar_t* wpath = _Py_DecodeUTF8_surrogateescape("", 0, &wlen);
  EXPECT_STREQ(wpath, L"");
  EXPECT_EQ(wlen, size_t{0});
  PyMem_RawFree(wpath);
}

TEST_F(UnicodeExtensionApiTest, DecodeUTF8SurrogateEscapeReturnsWideString) {
  const char* path = "/foo/bar/bat";
  size_t len = std::strlen(path);
  size_t wlen;
  wchar_t* wpath = _Py_DecodeUTF8_surrogateescape(path, len, &wlen);
  EXPECT_STREQ(wpath, L"/foo/bar/bat");
  EXPECT_EQ(wlen, len);
  PyMem_RawFree(wpath);
}

}  // namespace testing
}  // namespace py