Basic Async Action Creator Test

Jest handles async tests by allowing us to return a promise as the test’s result. If a promise is returned, the test runner will wait for the promise to resolve and only then continue to the next test:

it('FETCH_RECIPE', () => {
  return store.dispatch(actions.fetchRecipe(100));
});

Since store.dispatch() in this case returns a promise (remember, our fetchRecipe() action creator returns a call to the axios library), ...