1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.import { assert, assertEquals, AssertionError, assertRejects } from "./mod.ts";
Deno.test("assertRejects with return type", async () => {  await assertRejects(() => {    return Promise.reject(new Error());  });});
Deno.test("assertRejects with synchronous function that throws", async () => {  await assertRejects(() =>    assertRejects(() => {      throw new Error();    })  );  await assertRejects(    () =>      assertRejects(() => {        throw { wrong: "true" };      }),    AssertionError,    "Function throws when expected to reject.",  );});
Deno.test("assertRejects with PromiseLike", async () => {  await assertRejects(    () => ({      then() {        throw new Error("some error");      },    }),    Error,    "some error",  );});
Deno.test("assertRejects with non-error value rejected and error class", async () => {  await assertRejects(    () => {      return assertRejects(        () => {          return Promise.reject("Panic!");        },        Error,        "Panic!",      );    },    AssertionError,    "A non-Error object was rejected.",  );});
Deno.test("assertRejects with non-error value rejected", async () => {  await assertRejects(() => {    return Promise.reject(null);  });  await assertRejects(() => {    return Promise.reject(undefined);  });});
Deno.test("assertRejects with error class", async () => {  await assertRejects(    () => {      return Promise.reject(new Error("foo"));    },    Error,    "foo",  );});
Deno.test("assertRejects resolves with caught error", async () => {  const error = await assertRejects(    () => {      return Promise.reject(new Error("foo"));    },  );  assert(error instanceof Error);  assertEquals(error.message, "foo");});
Deno.test("Assert Throws Async Parent Error", async () => {  await assertRejects(    () => {      return Promise.reject(new AssertionError("Fail!"));    },    Error,    "Fail!",  );});
Deno.test(  "Assert Throws Async promise rejected with custom Error",  async () => {    class CustomError extends Error {}    class AnotherCustomError extends Error {}    await assertRejects(      () =>        assertRejects(          () => Promise.reject(new AnotherCustomError("failed")),          CustomError,          "fail",        ),      AssertionError,      'Expected error to be instance of "CustomError", but was "AnotherCustomError".',    );  },);