Flutter Integration Testing- How to go back to previous screen when no back button available on screen

Question

How to go back to previous screen when no back button available on screen? Additional Information: I am trying to automate integration testing for flutter app. There is no back button on screen which I can use to go back screen. Additional information: I am writing integration tests, for same I need to go back to previous screen. And due to design there is no back button on screen, I need to do by scripts only.

Aqueous

You won't answer, for developing prospective or testing? – Quinn

Testing perspective – Aqueous

Answer 1

This is what worked for me for OpenContainers from the animations package:

  final NavigatorState navigator = tester.state(find.byType(Navigator));
  navigator.pop();
  await tester.pump();

It's used in the flutter package's tests:

https://github.com/flutter/packages/blob/63040337424f345452a5e07632774e6585329ac0/packages/animations/test/open_container_test.dart#L234

Leverick

Answer 2

If the purpose of the test is to stress and verify the WillPopScope callbacks as well, the following approach can be used:

final dynamic widgetsAppState = _._tester.state(find.byType(WidgetsApp));
await widgetsAppState.didPopRoute();

This is used in the Flutter official repository for testing: https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/will_pop_test.dart

Note that this approach also works to simulate a back button pressed on Android.

Fortuneteller

Answer 3

Well, it's maybe a little bit late, however there are two possible ways to achieve this:

final backButton = find.byTooltip('Back');

await driver.tap(backButton);

or:

await driver.tap(find.pageBack());

Stanley

Answer 4

My emulador defaulf locale is "en_US" so I use the word "Back" as tooltip and it is working.

final backButton = find.byTooltip("Back");
await tester.tap(backButton);
await tester.pumpAndSettle();

Incunabula

Answer 5

you can use like this as ios provided

theme: ThemeData(
pageTransitionsTheme: PageTransitionsTheme(
  builders: {
    TargetPlatform.android: CupertinoPageTransitionsBuilder(),
    TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
  }
 )
),

Chew

Answer 6

In my integration tests, I used this way to tap the back button on the Android emulator:

   ...
   if(Platform.isAndroid) {
     await Process.run('input', <String>['keyevent', 'KEYCODE_BACK'] );
   }
   ...

I hope it helps!

Intemerate