forked from jestjs/jest
/
assertionCounts.test.ts
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/
assertionCounts.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 {alignedAnsiStyleSerializer} from '@jest/test-utils';
import jestExpect from '../';
expect.addSnapshotSerializer(alignedAnsiStyleSerializer);
describe('.assertions()', () => {
it('does not throw', () => {
jestExpect.assertions(2);
jestExpect('a').not.toBe('b');
jestExpect('a').toBe('a');
});
it('redeclares different assertion count', () => {
jestExpect.assertions(3);
jestExpect('a').not.toBe('b');
jestExpect('a').toBe('a');
jestExpect.assertions(2);
});
it('expects no assertions', () => {
jestExpect.assertions(0);
});
});
describe('.hasAssertions()', () => {
it('does not throw if there is an assertion', () => {
jestExpect.hasAssertions();
jestExpect('a').toBe('a');
});
it('throws if expected is not undefined', () => {
expect(() => {
// @ts-expect-error
jestExpect.hasAssertions(2);
}).toThrowErrorMatchingSnapshot();
});
it('hasAssertions not leaking to global state', () => {});
});
describe('numPassingAsserts', () => {
it('verify the default value of numPassingAsserts', () => {
const {numPassingAsserts} = jestExpect.getState();
expect(numPassingAsserts).toBe(0);
});
it('verify the resetting of numPassingAsserts after a test', () => {
expect('a').toBe('a');
expect('a').toBe('a');
// reset state
jestExpect.extractExpectedAssertionsErrors();
const {numPassingAsserts} = jestExpect.getState();
expect(numPassingAsserts).toBe(0);
});
it('verify the correctness of numPassingAsserts count for passing test', () => {
expect('a').toBe('a');
expect('a').toBe('a');
const {numPassingAsserts} = jestExpect.getState();
expect(numPassingAsserts).toBe(2);
});
it('verify the correctness of numPassingAsserts count for failing test', () => {
expect('a').toBe('a');
try {
expect('a').toBe('b');
} catch (error) {}
const {numPassingAsserts} = jestExpect.getState();
expect(numPassingAsserts).toBe(1);
});
});