runTest abstract method Null safety

Future<void> runTest(
  1. Future<void> testBody(
      ),
    1. VoidCallback invariantTester,
    2. {String description = '',
    3. @Deprecated('This parameter has no effect. Use the `timeout` parameter on `testWidgets` instead. ' 'This feature was deprecated after v2.6.0-1.0.pre.') Duration? timeout}
    )

    Call the testBody inside a FakeAsync scope on which pump can advance time.

    Returns a future which completes when the test has run.

    Called by the testWidgets and benchmarkWidgets functions to run a test.

    The invariantTester argument is called after the testBody's Future completes. If it throws, then the test is marked as failed.

    The description is used by the LiveTestWidgetsFlutterBinding to show a label on the screen during the test. The description comes from the value passed to testWidgets. It must not be null.

    Implementation

    Future<void> runTest(
      Future<void> Function() testBody,
      VoidCallback invariantTester, {
      String description = '',
      @Deprecated(
        'This parameter has no effect. Use the `timeout` parameter on `testWidgets` instead. '
        'This feature was deprecated after v2.6.0-1.0.pre.'
      )
      Duration? timeout,
    });