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std/expect/_to_throw_test.ts

Deno standard library
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { expect } from "./expect.ts";import { AssertionError, assertThrows } from "../assert/mod.ts";
Deno.test("expect().toThrow()", () => { expect(() => { throw new Error("hello world"); }).toThrow();
expect(() => {}).not.toThrow();
assertThrows(() => { expect(() => {}).toThrow(); }, AssertionError);
assertThrows(() => { expect(() => { throw new Error("hello world"); }).not.toThrow(); }, AssertionError);
// Passes when type is correct expect(() => { throw new AssertionError("hello world"); }).toThrow(AssertionError);
// Throws when type is incorrect assertThrows( () => { expect(() => { throw new Error("hello world"); }).toThrow(AssertionError); }, AssertionError, 'Expected error to be instance of "AssertionError", but was "Error".', );
// Passes when error instance type is correct expect(() => { throw new AssertionError("hello world"); }).toThrow(new AssertionError("hello world"));
// Throws when error instance type is incorrect assertThrows( () => { expect(() => { throw new Error("hello world"); }).toThrow(new AssertionError("hello world")); }, AssertionError, 'Expected error to be instance of "AssertionError", but was "Error".', );
// Passes when literal string is in error expect(() => { throw new AssertionError("hello world"); }).toThrow("hello");
// Throws when literal string is not in error assertThrows( () => { expect(() => { throw new AssertionError("hello world"); }).toThrow("goodbye"); }, AssertionError, 'Expected error message to include "goodbye", but got "hello world".', );
// Passes when error instance string is in error expect(() => { throw new AssertionError("hello world"); }).toThrow(new AssertionError("hello world"));
// Throws when error instance string is not in error assertThrows( () => { expect(() => { throw new AssertionError("hello world"); }).toThrow(new AssertionError("goodbye")); }, AssertionError, 'Expected error message to include "goodbye", but got "hello world".', );
// Passes when regex does match error expect(() => { throw new AssertionError("hello world"); }).toThrow(/\w/);
// Throws when regex does not match error assertThrows( () => { expect(() => { throw new Error("hello world"); }).toThrow(/\d/); }, AssertionError, 'Expected error message to include /\\d/, but got "hello world".', );});