evaluate method

Implementation

@override
Future<Evaluation> evaluate(WidgetTester tester) async {
  Evaluation result = const Evaluation.pass();
  for (final RenderView renderView in tester.binding.renderViews) {
    final OffsetLayer layer = renderView.debugLayer! as OffsetLayer;
    final SemanticsNode root = renderView.owner!.semanticsOwner!.rootSemanticsNode!;

    late ui.Image image;
    final ByteData? byteData = await tester.binding.runAsync<ByteData?>(() async {
      // Needs to be the same pixel ratio otherwise our dimensions won't match
      // the last transform layer.
      final double ratio = 1 / renderView.flutterView.devicePixelRatio;
      image = await layer.toImage(renderView.paintBounds, pixelRatio: ratio);
      final ByteData? data = await image.toByteData();
      image.dispose();
      return data;
    });

    result += await _evaluateNode(root, tester, image, byteData!, renderView);
  }

  return result;
}