MinimumTextContrastGuideline should exclude disabled component (#94489)

packages/flutter_test/lib/src/accessibility.dart

@@ -212,7 +212,10 @@ class MinimumTextContrastGuideline extends AccessibilityGuideline {
 
     Future<Evaluation> evaluateNode(SemanticsNode node) async {
       Evaluation result = const Evaluation.pass();
-      if (node.isInvisible || node.isMergedIntoParent || node.hasFlag(ui.SemanticsFlag.isHidden))
+      if (node.isInvisible ||
+          node.isMergedIntoParent ||
+          node.hasFlag(ui.SemanticsFlag.isHidden) ||
+          (node.hasFlag(ui.SemanticsFlag.hasEnabledState) && !node.hasFlag(ui.SemanticsFlag.isEnabled)))
         return result;
       final SemanticsData data = node.getSemanticsData();
       final List<SemanticsNode> children = <SemanticsNode>[];

packages/flutter_test/test/accessibility_test.dart

@@ -177,6 +177,29 @@ void main() {
       expect(result.passed, true);
       handle.dispose();
     });
+
+    testWidgets('Disabled button is excluded from text contrast guideline', (WidgetTester tester) async {
+      // Regression test https://github.com/flutter/flutter/issues/94428
+      final SemanticsHandle handle = tester.ensureSemantics();
+      await tester.pumpWidget(
+        _boilerplate(
+          ElevatedButton(
+            onPressed: null,
+            child: Container(
+              width: 200.0,
+              height: 200.0,
+              color: Colors.yellow,
+              child: const Text(
+                'this is a test',
+                style: TextStyle(fontSize: 14.0, color: Colors.yellowAccent),
+              ),
+            ),
+          ),
+        )
+      );
+      await expectLater(tester, meetsGuideline(textContrastGuideline));
+      handle.dispose();
+    });
   });
 
   group('custom minimum contrast guideline', () {