We need a robust way to get the duration of a route transition in tests,
so that tests can remain independent of the type of route transition and
its duration.
With this PR, this will be the canonical way to pump until a page
transition has finished:
```dart
testWidgets('example', (WidgetTester tester) async {
final TransitionDurationObserver observer = TransitionDurationObserver();
await tester.pumpWidget(
MaterialApp(
navigatorObservers: <NavigatorObserver>[observer],
onGenerateRoute: (RouteSettings settings) { ... },
),
);
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 2'), findsNothing);
// Pump through the whole transition.
await tester.tap(find.text('Next'));
await observer.pumpPastTransition(tester);
expect(find.text('Page 1'), findsNothing);
expect(find.text('Page 2'), findsOneWidget);
// Or, pump through part of a transition with the duration.
await tester.tap(find.text('Back'));
await tester.pump(observer.transitionDuration ~/ 2);
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 2'), findsOneWidget);
});
```
This was spun out of https://github.com/flutter/flutter/pull/165832,
where updating the default route transition and its duration broke tests
in the framework, in customer tests, and in Google tests.
FYI @chrisbobbe
---------
Co-authored-by: Jing Shao <87506348+jingshao-code@users.noreply.github.com>
This auto-formats all *.dart files in the repository outside of the
`engine` subdirectory and enforces that these files stay formatted with
a presubmit check.
**Reviewers:** Please carefully review all the commits except for the
one titled "formatted". The "formatted" commit was auto-generated by
running `dev/tools/format.sh -a -f`. The other commits were hand-crafted
to prepare the repo for the formatting change. I recommend reviewing the
commits one-by-one via the "Commits" tab and avoiding Github's "Files
changed" tab as it will likely slow down your browser because of the
size of this PR.
---------
Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
Updated tests in dev, examples/api, and tests/widgets to ensure that
they continue to pass when the default for `ThemeData.useMaterial3` is
changed to true.
This is the final set of changes required for
https://github.com/flutter/flutter/issues/127064.
