precacheImages function

Future<void> precacheImages(WidgetTester tester)

A custom PumpAction to ensure that the images for all Image, FadeInImage, and DecoratedBox widgets are loaded before the golden file is generated.

See PumpAction for more details.

Implementation

Future<void> precacheImages(WidgetTester tester) async {
  await tester.runAsync(() async {
    final images = <Future<void>>[];
    for (final element in find.byType(Image).evaluate()) {
      final widget = element.widget as Image;
      final image = widget.image;
      images.add(precacheImage(image, element));
    }
    for (final element in find.byType(FadeInImage).evaluate()) {
      final widget = element.widget as FadeInImage;
      final image = widget.image;
      images.add(precacheImage(image, element));
    }
    for (final element in find.byType(DecoratedBox).evaluate()) {
      final widget = element.widget as DecoratedBox;
      final decoration = widget.decoration;
      if (decoration is BoxDecoration && decoration.image != null) {
        final image = decoration.image!.image;
        images.add(precacheImage(image, element));
      }
    }
    await Future.wait(images);
  });
  await tester.pumpAndSettle();
}