test_await_future_runasync.dart

import "dart:async";
import "package:flutter_test/flutter_test.dart";

void main() {
  Future future;
  
  setUp(() {
    future = new Future.value();
  });

  testWidgets("awaiting future with value from setUp works", (WidgetTester tester) async {
    await tester.runAsync(() => future);
  });
}