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 looks for tests that have assertions in then and catch methods on promises that are not returned by the test.

Default configuration

The following pattern is considered warning:

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

The following pattern is not warning:

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