Revert "Update accessibility contrast test coverage (#109784)" (#110436)

This reverts commit f477c8b1.

packages/flutter_test/lib/src/accessibility.dart

@@ -331,54 +331,27 @@ class MinimumTextContrastGuideline extends AccessibilityGuideline {
     if (shouldSkipNode(data)) {
       return result;
     }
-    final String text = data.label.isEmpty ? data.value : data.label;
-    final Iterable<Element> elements = find.text(text).hitTestable().evaluate();
-    for (final Element element in elements) {
-      result += await _evaluateElement(node, element, tester, image, byteData);
-    }
-    return result;
-  }
 
-  Future<Evaluation> _evaluateElement(
-    SemanticsNode node,
-    Element element,
-    WidgetTester tester,
-    ui.Image image,
-    ByteData byteData,
-  ) async {
     // Look up inherited text properties to determine text size and weight.
     late bool isBold;
     double? fontSize;
 
+    final String text = data.label.isEmpty ? data.value : data.label;
+    final List<Element> elements = find.text(text).hitTestable().evaluate().toList();
     late final Rect paintBounds;
-    late final Rect paintBoundsWithOffset;
 
+    if (elements.length == 1) {
+      final Element element = elements.single;
       final RenderObject? renderBox = element.renderObject;
       if (renderBox is! RenderBox) {
         throw StateError('Unexpected renderObject type: $renderBox');
       }
 
       const Offset offset = Offset(4.0, 4.0);
-    paintBoundsWithOffset = Rect.fromPoints(
+      paintBounds = Rect.fromPoints(
         renderBox.localToGlobal(renderBox.paintBounds.topLeft - offset),
         renderBox.localToGlobal(renderBox.paintBounds.bottomRight + offset),
       );
-
-    paintBounds = Rect.fromPoints(
-      renderBox.localToGlobal(renderBox.paintBounds.topLeft),
-      renderBox.localToGlobal(renderBox.paintBounds.bottomRight),
-    );
-
-    final Offset? nodeOffset = node.transform != null ? MatrixUtils.getAsTranslation(node.transform!) : null;
-
-    final Rect nodeBounds = node.rect.shift(nodeOffset ?? Offset.zero);
-    final Rect intersection = nodeBounds.intersect(paintBounds);
-    if (intersection.width <= 0 || intersection.height <= 0) {
-      // Skip this element since it doesn't correspond to the given semantic
-      // node.
-      return const Evaluation.pass();
-    }
-
       final Widget widget = element.widget;
       final DefaultTextStyle defaultTextStyle = DefaultTextStyle.of(element);
       if (widget is Text) {
@@ -394,16 +367,25 @@ class MinimumTextContrastGuideline extends AccessibilityGuideline {
       } else {
         throw StateError('Unexpected widget type: ${widget.runtimeType}');
       }
+    } else if (elements.length > 1) {
+      return Evaluation.fail(
+        'Multiple nodes with the same label: ${data.label}\n',
+      );
+    } else {
+      // If we can't find the text node then assume the label does not
+      // correspond to actual text.
+      return result;
+    }
 
-    if (isNodeOffScreen(paintBoundsWithOffset, tester.binding.window)) {
-      return const Evaluation.pass();
+    if (isNodeOffScreen(paintBounds, tester.binding.window)) {
+      return result;
     }
 
-    final Map<Color, int> colorHistogram = _colorsWithinRect(byteData, paintBoundsWithOffset, image.width, image.height);
+    final Map<Color, int> colorHistogram = _colorsWithinRect(byteData, paintBounds, image.width, image.height);
 
     // Node was too far off screen.
     if (colorHistogram.isEmpty) {
-      return const Evaluation.pass();
+      return result;
     }
 
     final _ContrastReport report = _ContrastReport(colorHistogram);
@@ -412,9 +394,10 @@ class MinimumTextContrastGuideline extends AccessibilityGuideline {
     final double targetContrastRatio = this.targetContrastRatio(fontSize, bold: isBold);
 
     if (contrastRatio - targetContrastRatio >= _tolerance) {
-      return const Evaluation.pass();
+      return result + const Evaluation.pass();
     }
-    return Evaluation.fail(
+    return result +
+        Evaluation.fail(
           '$node:\n'
           'Expected contrast ratio of at least $targetContrastRatio '
           'but found ${contrastRatio.toStringAsFixed(2)} '

packages/flutter_test/test/accessibility_test.dart

@@ -23,61 +23,6 @@ void main() {
       handle.dispose();
     });
 
-    testWidgets('Multiple text with same label', (WidgetTester tester) async {
-      final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(
-        _boilerplate(
-          Column(
-            children: const <Widget>[
-              Text(
-                'this is a test',
-                style: TextStyle(fontSize: 14.0, color: Colors.black),
-              ),
-              Text(
-                'this is a test',
-                style: TextStyle(fontSize: 14.0, color: Colors.black),
-              ),
-            ],
-          ),
-        ),
-      );
-      await expectLater(tester, meetsGuideline(textContrastGuideline));
-      handle.dispose();
-    });
-
-    testWidgets(
-      'Multiple text with same label but Nodes excluded from '
-      'semantic tree have failing contrast should pass a11y guideline ',
-      (WidgetTester tester) async {
-        final SemanticsHandle handle = tester.ensureSemantics();
-        await tester.pumpWidget(
-          _boilerplate(
-            Column(
-              children: const <Widget>[
-                Text(
-                  'this is a test',
-                  style: TextStyle(fontSize: 14.0, color: Colors.black),
-                ),
-                SizedBox(height: 50),
-                Text(
-                  'this is a test',
-                  style: TextStyle(fontSize: 14.0, color: Colors.black),
-                ),
-                SizedBox(height: 50),
-                ExcludeSemantics(
-                  child: Text(
-                    'this is a test',
-                    style: TextStyle(fontSize: 14.0, color: Colors.white),
-                  ),
-                ),
-              ],
-            ),
-          ),
-        );
-        await expectLater(tester, meetsGuideline(textContrastGuideline));
-        handle.dispose();
-    });
-
     testWidgets('white text on black background - Text Widget - direct style',
         (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();