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.

https://docs.flutter.io/flutter/flutter_test/WidgetTester/pageBack.html — Günter Zöchbauer, Aug 31 '18 at 04:13
@GünterZöchbauer This test whether there is a button, but not if the route was actually popped. — creativecreatorormaybenot, Aug 31 '18 at 07:35
https://stackoverflow.com/questions/50704647/how-to-test-navigation-via-navigator-in-flutter — Günter Zöchbauer, Aug 31 '18 at 07:48
I used *tester.pumpAndSettle() * after entering into page then tried tester.goBack() and it worked. Thank you @Günter Zöchbauer — STeamup, Sep 07 '18 at 03:21
Glad to hear. You could answer your own question with your solution. — Günter Zöchbauer, Sep 07 '18 at 03:59
@GünterZöchbauer when I use tester.pageBack() , I get an error zero widgets with type "CupertinoNavigationBarBackButton" (this is in widget test) `phonePage = MediaQuery( data: MediaQueryData(), child: MaterialApp( home: PhonePage(), navigatorObservers: [observer], ), );` — TSR, Jun 03 '20 at 00:16

score 1 · Answer 1 · answered Jul 02 '20 at 10:49

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();

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

1 Answers1