[cupertino_ui] Migrate picker_test.dart to SemanticsHandle (#12008)

Part of flutter/flutter#182636 and flutter/flutter#188395

This PR:
* Removed the cross-import of `widgets/semantics_tester.dart`. Replaced `SemanticsTester` with `SemanticsHandle`.
* Removed `@Skip` annotation, all tests in this file has passed. `semantics_tester.dart` has existed in `cupertino_ui`, so we can directly import `semantics_tester.dart`;
* Moved the file to `test/` folder.

## Pre-Review Checklist

Author: Renzo-Olivares

…porarily_disabled_tests/picker_test.dart …kages/cupertino_ui/test/picker_test.dartpackages/cupertino_ui/temporarily_disabled_tests/picker_test.dart renamed to packages/cupertino_ui/test/picker_test.dart packages/cupertino_ui/temporarily_disabled_tests/picker_test.dart renamed to packages/cupertino_ui/test/picker_test.dart

@@ -2,17 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-@Skip(
-  'This file is skipped due to a cross-import that needs to be fixed. Tracked in https://github.com/flutter/flutter/issues/177028.',
-)
 import 'package:cupertino_ui/cupertino_ui.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import '../widgets/semantics_tester.dart';
-
 /// A [CustomPainter] that calls a callback when it paints.
 class TestCallbackPainter extends CustomPainter {
   /// Creates a [TestCallbackPainter] that calls [onPaint] when it paints.
@@ -73,7 +68,7 @@ void main() {
   });
 
   testWidgets('Picker semantics', (WidgetTester tester) async {
-    final semantics = SemanticsTester(tester);
+    final SemanticsHandle handle = tester.ensureSemantics();
 
     await tester.pumpWidget(
       CupertinoApp(
@@ -90,11 +85,16 @@ void main() {
       ),
     );
     expect(
-      semantics,
-      includesNodeWith(
+      tester.getSemantics(
+        find.byWidgetPredicate(
+          (Widget widget) => widget.runtimeType.toString() == '_CupertinoPickerSemantics',
+        ),
+      ),
+      isSemantics(
         value: '0',
         increasedValue: '1',
-        actions: <SemanticsAction>[SemanticsAction.increase],
+        hasIncreaseAction: true,
+        hasDecreaseAction: false,
       ),
     );
 
@@ -105,23 +105,29 @@ void main() {
     hourListController.jumpToItem(11);
     await tester.pumpAndSettle();
     expect(
-      semantics,
-      includesNodeWith(
+      tester.getSemantics(
+        find.byWidgetPredicate(
+          (Widget widget) => widget.runtimeType.toString() == '_CupertinoPickerSemantics',
+        ),
+      ),
+      isSemantics(
         value: '11',
         increasedValue: '12',
         decreasedValue: '10',
-        actions: <SemanticsAction>[SemanticsAction.increase, SemanticsAction.decrease],
+        hasIncreaseAction: true,
+        hasDecreaseAction: true,
       ),
     );
-    semantics.dispose();
+
+    handle.dispose();
   });
 
   testWidgets('Picker semantics excludes current item with empty label', (
     WidgetTester tester,
   ) async {
     // When the current item has an empty label (e.g., wrapped with ExcludeSemantics),
     // the picker should not set any value, increasedValue, decreasedValue, or actions.
-    final semantics = SemanticsTester(tester);
+    final SemanticsHandle handle = tester.ensureSemantics();
     final controller = FixedExtentScrollController(initialItem: 1);
     addTearDown(controller.dispose);
 
@@ -146,15 +152,13 @@ void main() {
 
     // When the current item (index 1) has an empty label due to ExcludeSemantics,
     // the picker should not have any value or actions set.
-    expect(semantics, isNot(includesNodeWith(value: '1')));
-    // Also verify that no increase/decrease actions are set for this item.
-    expect(
-      semantics,
-      isNot(includesNodeWith(actions: <SemanticsAction>[SemanticsAction.increase])),
-    );
     expect(
-      semantics,
-      isNot(includesNodeWith(actions: <SemanticsAction>[SemanticsAction.decrease])),
+      tester.getSemantics(
+        find.byWidgetPredicate(
+          (Widget widget) => widget.runtimeType.toString() == '_CupertinoPickerSemantics',
+        ),
+      ),
+      isSemantics(value: '', hasIncreaseAction: false, hasDecreaseAction: false),
     );
 
     // Scroll to item 0 which has a valid label.
@@ -163,10 +167,13 @@ void main() {
 
     // Now the picker should have value '0' but no increase action
     // because the next item (1) has an empty label.
-    expect(semantics, includesNodeWith(value: '0'));
     expect(
-      semantics,
-      isNot(includesNodeWith(value: '0', actions: <SemanticsAction>[SemanticsAction.increase])),
+      tester.getSemantics(
+        find.byWidgetPredicate(
+          (Widget widget) => widget.runtimeType.toString() == '_CupertinoPickerSemantics',
+        ),
+      ),
+      isSemantics(value: '0', hasIncreaseAction: false, hasDecreaseAction: false),
     );
 
     // Scroll to item 2 which has a valid label.
@@ -175,13 +182,15 @@ void main() {
 
     // Now the picker should have value '2' but no decrease action
     // because the previous item (1) has an empty label.
-    expect(semantics, includesNodeWith(value: '2'));
     expect(
-      semantics,
-      isNot(includesNodeWith(value: '2', actions: <SemanticsAction>[SemanticsAction.decrease])),
+      tester.getSemantics(
+        find.byWidgetPredicate(
+          (Widget widget) => widget.runtimeType.toString() == '_CupertinoPickerSemantics',
+        ),
+      ),
+      isSemantics(value: '2', hasDecreaseAction: false, hasIncreaseAction: false),
     );
-
-    semantics.dispose();
+    handle.dispose();
   });
 
   group('layout', () {