Dart Academy · Lesson

Testing async Code and Streams

Await futures and verify event sequences.

Async Needs Care

Lots of real code returns a Future. If a test forgets to wait, it may pass before the work even finishes. ⏳

The runner waits when your test body is async and you await the work, or when you return the Future directly.

test('loads user', () async {
  final u = await fetchUser();
  expect(u.name, 'Ada');
});