[material_ui] Port flutter/flutter #186670 "Use local semantics tester in Material selection tests" (#11983)

This PR ports flutter/flutter#186670 by @MarlonJD from flutter/flutter to flutter/packages.

It moves the affected Material selection tests from material_ui's `temporarily_disabled_tests` directory into the main `test` directory now that their gross `../widgets/semantics_tester.dart` import has been fixed to use material_ui's local `semantics_tester.dart`.

This follows the porting instructions in flutter/flutter#188444:
- merge commits from the original PR are not included
- the affected `temporarily_disabled_tests` files are moved into the main test directory after fixing the gross import

Validation:
- `dart format --set-exit-if-changed packages/material_ui/test/checkbox_test.dart packages/material_ui/test/radio_test.dart packages/material_ui/test/range_slider_test.dart packages/material_ui/test/slider_test.dart packages/material_ui/test/toggle_buttons_test.dart`
- `git diff --check`
- `flutter test test/checkbox_test.dart test/radio_test.dart test/range_slider_test.dart test/slider_test.dart test/toggle_buttons_test.dart`

The targeted test command passed with 304 tests.

Author: MarlonJD

…rarily_disabled_tests/checkbox_test.dart …ages/material_ui/test/checkbox_test.dartpackages/material_ui/temporarily_disabled_tests/checkbox_test.dart renamed to packages/material_ui/test/checkbox_test.dart packages/material_ui/temporarily_disabled_tests/checkbox_test.dart renamed to packages/material_ui/test/checkbox_test.dart

@@ -2,20 +2,17 @@
 // 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 'dart:ui';
 
 import 'package:cupertino_ui/cupertino_ui.dart';
 import 'package:flutter/foundation.dart';
-import 'package:material_ui/material_ui.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/src/gestures/constants.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:material_ui/material_ui.dart';
 
-import '../widgets/semantics_tester.dart';
+import 'semantics_tester.dart';
 
 void main() {
   final theme = ThemeData();

…mporarily_disabled_tests/radio_test.dart packages/material_ui/test/radio_test.dartpackages/material_ui/temporarily_disabled_tests/radio_test.dart renamed to packages/material_ui/test/radio_test.dart packages/material_ui/temporarily_disabled_tests/radio_test.dart renamed to packages/material_ui/test/radio_test.dart

@@ -2,9 +2,6 @@
 // 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.',
-)
 // This file is run as part of a reduced test set in CI on Mac and Windows
 // machines.
 @Tags(<String>['reduced-test-set'])
@@ -14,13 +11,13 @@ import 'dart:ui';
 
 import 'package:cupertino_ui/cupertino_ui.dart';
 import 'package:flutter/foundation.dart';
-import 'package:material_ui/material_ui.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/src/gestures/constants.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:material_ui/material_ui.dart';
 
-import '../widgets/semantics_tester.dart';
+import 'semantics_tester.dart';
 
 void main() {
   final theme = ThemeData();

…ly_disabled_tests/range_slider_test.dart …/material_ui/test/range_slider_test.dartpackages/material_ui/temporarily_disabled_tests/range_slider_test.dart renamed to packages/material_ui/test/range_slider_test.dart packages/material_ui/temporarily_disabled_tests/range_slider_test.dart renamed to packages/material_ui/test/range_slider_test.dart

@@ -2,18 +2,15 @@
 // 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:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:material_ui/material_ui.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/src/physics/utils.dart' show nearEqual;
 import 'package:flutter_test/flutter_test.dart';
+import 'package:material_ui/material_ui.dart';
 
-import '../widgets/semantics_tester.dart';
+import 'semantics_tester.dart';
 
 void main() {
   // Regression test for https://github.com/flutter/flutter/issues/105833

…_disabled_tests/toggle_buttons_test.dart …aterial_ui/test/toggle_buttons_test.dartpackages/material_ui/temporarily_disabled_tests/toggle_buttons_test.dart renamed to packages/material_ui/test/toggle_buttons_test.dart packages/material_ui/temporarily_disabled_tests/toggle_buttons_test.dart renamed to packages/material_ui/test/toggle_buttons_test.dart

@@ -2,21 +2,18 @@
 // 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.',
-)
 // This file is run as part of a reduced test set in CI on Mac and Windows
 // machines.
 @Tags(<String>['reduced-test-set'])
 library;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
-import 'package:material_ui/material_ui.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:material_ui/material_ui.dart';
 
-import '../widgets/semantics_tester.dart';
+import 'semantics_tester.dart';
 
 const double _defaultBorderWidth = 1.0;