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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.import {  assert,  assertEquals,  AssertionError,  assertThrows,  fail,} from "./mod.ts";
Deno.test("assertThrows() throws when thrown error class does not match expected", () => {  assertThrows(    () => {      //This next assertThrows will throw an AssertionError due to the wrong      //expected error class      assertThrows(        () => {          fail("foo");        },        TypeError,        "Failed assertion: foo",      );    },    AssertionError,    `Expected error to be instance of "TypeError", but was "AssertionError"`,  );});
Deno.test("assertThrows() changes its return type by parameter", () => {  assertThrows(() => {    throw new Error();  });});
Deno.test("assertThrows() throws when error class is expected but non-error value is thrown", () => {  assertThrows(    () => {      assertThrows(        () => {          throw "Panic!";        },        Error,        "Panic!",      );    },    AssertionError,    "A non-Error object was thrown.",  );});
Deno.test("assertThrows() matches thrown non-error value", () => {  assertThrows(    () => {      throw "Panic!";    },  );  assertThrows(    () => {      throw null;    },  );  assertThrows(    () => {      throw undefined;    },  );});
Deno.test("assertThrows() matches thrown error with given error class", () => {  assertThrows(    () => {      throw new Error("foo");    },    Error,    "foo",  );});
Deno.test("assertThrows() matches and returns thrown error value", () => {  const error = assertThrows(    () => {      throw new Error("foo");    },  );  assert(error instanceof Error);  assertEquals(error.message, "foo");});
Deno.test("assertThrows() matches and returns thrown non-error", () => {  const stringError = assertThrows(    () => {      throw "Panic!";    },  );  assert(typeof stringError === "string");  assertEquals(stringError, "Panic!");
  const numberError = assertThrows(    () => {      throw 1;    },  );  assert(typeof numberError === "number");  assertEquals(numberError, 1);
  const nullError = assertThrows(    () => {      throw null;    },  );  assert(nullError === null);
  const undefinedError = assertThrows(    () => {      throw undefined;    },  );  assert(typeof undefinedError === "undefined");  assertEquals(undefinedError, undefined);});
Deno.test("assertThrows() matches subclass of expected error", () => {  assertThrows(    () => {      throw new AssertionError("Fail!");    },    Error,    "Fail!",  );});