Ensure promises that have expectations in their chain are valid (valid-expect-in-promise)

Ensure promises that include expectations are returned or awaited.

Rule details

This rule flags any promises within the body of a test that include expectations that have either not been returned or awaited.

The following patterns is considered warning:

```js it('promises a person', () => { api.getPersonByName('bob').then(person => { expect(person).toHaveProperty('name', 'Bob'); }); });

it('promises a counted person', () => { const promise = api.getPersonByName('bob').then(person => { expect(person).toHaveProperty('name', 'Bob'); });

promise.then(() => { expect(analytics.gottenPeopleCount).toBe(1); }); });

it('promises multiple people', () => { const firstPromise = api.getPersonByName('bob').then(person => { expect(person).toHaveProperty('name', 'Bob'); }); const secondPromise = api.getPersonByName('alice').then(person => { expect(person).toHaveProperty('name', 'Alice'); });

return Promise.any([firstPromise, secondPromise]); }); ```

The following pattern is not warning:

```js it('promises a person', async () => { await api.getPersonByName('bob').then(person => { expect(person).toHaveProperty('name', 'Bob'); }); });

it('promises a counted person', () => { let promise = api.getPersonByName('bob').then(person => { expect(person).toHaveProperty('name', 'Bob'); });

promise = promise.then(() => { expect(analytics.gottenPeopleCount).toBe(1); });

return promise; });

it('promises multiple people', () => { const firstPromise = api.getPersonByName('bob').then(person => { expect(person).toHaveProperty('name', 'Bob'); }); const secondPromise = api.getPersonByName('alice').then(person => { expect(person).toHaveProperty('name', 'Alice'); });

return Promise.allSettled([firstPromise, secondPromise]); }); ```