forked from jestjs/jest
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jest-expect.test.ts
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/
jest-expect.test.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {
expectAssignable,
expectError,
expectNotAssignable,
expectType,
} from 'tsd-lite';
import {jestExpect} from '@jest/expect';
import {expect} from 'expect';
import type {Plugin} from 'pretty-format';
expectType<void>(jestExpect({}).toMatchSnapshot());
expectError(() => {
expect({}).toMatchSnapshot();
});
expectType<void>(jestExpect.addSnapshotSerializer({} as Plugin));
expectError(() => {
expect.addSnapshotSerializer();
});
expectAssignable<typeof expect>(jestExpect);
expectNotAssignable<typeof jestExpect>(expect);
declare module 'expect' {
interface Matchers<R, T> {
toTypedEqual(expected: T): void;
}
}
expectType<void>(jestExpect(100).toTypedEqual(100));
expectType<void>(jestExpect(101).not.toTypedEqual(101));
expectError(() => {
jestExpect(100).toTypedEqual('three');
});