bernsteinbear.com
this repo has no description
1#!/usr/bin/env python3
2# Copyright (c) Facebook, Inc. and its affiliates. (http://www.facebook.com)
3import sys
4import unittest
5from typing import Dict, Generic, List, NamedTuple, Optional, TypeVar, Union
6
7
8class TypingTests(unittest.TestCase):
9 def test_generic_subclass_with_metaclass(self):
10 class M(type):
11 pass
12
13 A = TypeVar("A")
14 B = TypeVar("B")
15
16 class C(Generic[A, B], metaclass=M):
17 pass
18
19 self.assertIs(type(C), M)
20 self.assertTrue(issubclass(C, Generic))
21 self.assertTrue(isinstance(C(), Generic))
22
23 def test_typing_parameterized_generics(self):
24 def fn(val: Optional[Union[Dict, List]]):
25 return 5
26
27 self.assertEqual(fn(None), 5)
28
29 def test_namedtuple_keeps_textual_order_of_fields(self):
30 class C(NamedTuple):
31 zoozle: int
32 aardvark: str = ""
33 foo: int = 1
34 bar: int = 2
35 baz: int = 3
36
37 c = C(999, "abc", -1, -2, -3)
38 self.assertIs(c.zoozle, 999)
39 self.assertIs(c.aardvark, "abc")
40 self.assertIs(c.foo, -1)
41 self.assertIs(c.bar, -2)
42 self.assertIs(c.baz, -3)
43
44 def test_namedtuple_populates_default_values(self):
45 class C(NamedTuple):
46 zoozle: int
47 aardvark: str = ""
48 foo: int = 1
49 bar: int = 2
50 baz: int = 3
51
52 c = C(999)
53 self.assertIs(c.zoozle, 999)
54 self.assertIs(c.aardvark, "")
55 self.assertIs(c.foo, 1)
56 self.assertIs(c.bar, 2)
57 self.assertIs(c.baz, 3)
58
59
60if __name__ == "__main__":
61 unittest.main()