78 lines
2.1 KiB
Markdown
78 lines
2.1 KiB
Markdown
# Require promises that have expectations in their chain to be valid (`valid-expect-in-promise`)
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💼 This rule is enabled in the ✅ `recommended`
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[config](https://github.com/jest-community/eslint-plugin-jest/blob/main/README.md#shareable-configurations).
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<!-- end auto-generated rule header -->
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Ensure promises that include expectations are returned or awaited.
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## Rule details
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This rule flags any promises within the body of a test that include expectations
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that have either not been returned or awaited.
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The following patterns is considered warning:
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```js
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it('promises a person', () => {
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api.getPersonByName('bob').then(person => {
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expect(person).toHaveProperty('name', 'Bob');
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});
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});
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it('promises a counted person', () => {
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const promise = api.getPersonByName('bob').then(person => {
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expect(person).toHaveProperty('name', 'Bob');
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});
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promise.then(() => {
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expect(analytics.gottenPeopleCount).toBe(1);
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});
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});
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it('promises multiple people', () => {
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const firstPromise = api.getPersonByName('bob').then(person => {
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expect(person).toHaveProperty('name', 'Bob');
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});
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const secondPromise = api.getPersonByName('alice').then(person => {
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expect(person).toHaveProperty('name', 'Alice');
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});
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return Promise.any([firstPromise, secondPromise]);
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});
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```
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The following pattern is not warning:
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```js
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it('promises a person', async () => {
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await api.getPersonByName('bob').then(person => {
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expect(person).toHaveProperty('name', 'Bob');
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});
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});
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it('promises a counted person', () => {
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let promise = api.getPersonByName('bob').then(person => {
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expect(person).toHaveProperty('name', 'Bob');
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});
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promise = promise.then(() => {
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expect(analytics.gottenPeopleCount).toBe(1);
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});
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return promise;
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});
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it('promises multiple people', () => {
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const firstPromise = api.getPersonByName('bob').then(person => {
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expect(person).toHaveProperty('name', 'Bob');
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});
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const secondPromise = api.getPersonByName('alice').then(person => {
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expect(person).toHaveProperty('name', 'Alice');
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});
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return Promise.allSettled([firstPromise, secondPromise]);
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});
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```
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