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# Enforce having return statement when testing with promises (valid-expect-in-promise)

Ensure to return promise when having assertions in `then` or `catch` block of
promise

## Rule details

This rule triggers a warning if,

- test is having assertions in `then` or `catch` block of a promise
- and that promise is not returned from the test

### Default configuration

The following pattern is considered warning:

```js
it('promise test', () => {
  somePromise.then(data => {
    expect(data).toEqual('foo');
  });
});
```

The following pattern is not warning:

```js
it('promise test', () => {
  return somePromise.then(data => {
    expect(data).toEqual('foo');
  });
});
```