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Serenity Operating System
1describe("CallExpression", () => {
2 test("callee is evaluated before arguments", () => {
3 function foo() {}
4 const values = [];
5
6 [foo][(values.push("callee"), 0)](values.push("args"));
7
8 expect(values).toEqual(["callee", "args"]);
9 });
10
11 test("arguments are evaluated in order", () => {
12 function foo() {}
13 const values = [];
14
15 foo(values.push("arg1"), values.push("arg2"), values.push("arg3"));
16
17 expect(values).toEqual(["arg1", "arg2", "arg3"]);
18 });
19
20 test("arguments are evaluated before callee is checked for its type", () => {
21 const values = [];
22
23 expect(() => {
24 "foo"(values.push("args"));
25 }).toThrowWithMessage(TypeError, "foo is not a function");
26 expect(values).toEqual(["args"]);
27
28 expect(() => {
29 "foo"(bar);
30 }).toThrowWithMessage(ReferenceError, "'bar' is not defined");
31 });
32});
33
34describe("NewExpression", () => {
35 test("callee is evaluated before arguments", () => {
36 function Foo() {}
37 const values = [];
38
39 new [Foo][(values.push("callee"), 0)](values.push("args"));
40
41 expect(values).toEqual(["callee", "args"]);
42 });
43
44 test("arguments are evaluated in order", () => {
45 function Foo() {}
46 const values = [];
47
48 new Foo(values.push("arg1"), values.push("arg2"), values.push("arg3"));
49
50 expect(values).toEqual(["arg1", "arg2", "arg3"]);
51 });
52
53 test("arguments are evaluated before callee is checked for its type", () => {
54 const values = [];
55
56 expect(() => {
57 new "Foo"(values.push("args"));
58 }).toThrowWithMessage(TypeError, "Foo is not a constructor");
59 expect(values).toEqual(["args"]);
60
61 expect(() => {
62 new "Foo"(bar);
63 }).toThrowWithMessage(ReferenceError, "'bar' is not defined");
64 });
65});