flutter widget testing - how to execute test to "Go Back to Prevoius Screen"

Question

I am writing widget tests in Flutter. I am not able to find any documentation to execute "Go Back to Prevoius Screen" as I do not find any method for that. Please help with some sample "test" code for the same.

Answer 1

You have to mock navigation observer.

• First create class class MockNavigatorObserver extends Mock implements NavigatorObserver

• Declare final mockObserver = MockNavigatorObserver(); in your test file.

• Put your widget inside MaterialApp and add property navigatorObservers: [mockObserver],

• Finally inside your testWidgets block {} mock like this:

  final mockObserver = MockNavigatorObserver();
  final backIcon = find.byIcon(Icons.arrow_back_ios);
  expect(backIcon, findsOneWidget);
  await tester.tap(backIcon);
  verify(mockObserver.didPop(any, any));
  await tester.pumpAndSettle();