pumpPastTransition method

Future<void> pumpPastTransition(
  1. WidgetTester tester
)

Pumps the minimum number of frames required for the current page transition to run from start to finish.

Typically used immediately after starting a page transition in order to wait until the first frame in which the outgoing page is no longer visible.

This does not consider whether or not a page transition is currently running. If it's called in the middle of a page transition, for example, it will still pump for the full duration of the page transition, not just for the remaining duration.

link 
testWidgets('MyWidget', (WidgetTester tester) async {
  // ...Pump an app with two pages, then:
  expect(find.text('Page 1'), findsOneWidget);
  expect(find.text('Page 2'), findsNothing);

  await tester.tap(find.text('Next'));

  await transitionDurationObserver.pumpPastTransition(tester);

  expect(find.text('Page 1'), findsNothing);
  expect(find.text('Page 2'), findsOneWidget);
});

See also:

Implementation

Future<void> pumpPastTransition(WidgetTester tester) async {
  // The first pump is required to begin the page transition animation and
  // make the application no longer idle.
  await tester.pump();
  // Pumping for the full transitionDuration would move to the last frame of
  // the page transition, so pump one more frame after that.
  await tester.pump(transitionDuration + const Duration(milliseconds: 1));
}