[material_ui] Enable floating_action_button_test (#12014)

Port over `floating_action_button_test` from flutter/flutter#184279

Work towards flutter/flutter#182636 and flutter/flutter#188395

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Author: elliette

…d_tests/floating_action_button_test.dart …ui/test/floating_action_button_test.dartpackages/material_ui/temporarily_disabled_tests/floating_action_button_test.dart renamed to packages/material_ui/test/floating_action_button_test.dart packages/material_ui/temporarily_disabled_tests/floating_action_button_test.dart renamed to packages/material_ui/test/floating_action_button_test.dart

@@ -2,23 +2,22 @@
 // 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'])
 @TestOn('!chrome')
 library;
 
+import 'dart:async';
 import 'dart:ui';
 
 import 'package:flutter/foundation.dart' show kIsWeb;
-import 'package:material_ui/material_ui.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
-import '../widgets/feedback_tester.dart';
-import '../widgets/semantics_tester.dart';
+import 'package:material_ui/material_ui.dart';
+
+import 'feedback_tester.dart';
+import 'semantics_tester.dart';
 
 void main() {
   final material3Theme = ThemeData();
@@ -505,17 +504,19 @@ void main() {
         ),
       ),
     );
-    Navigator.push(
-      theContext,
-      PageRouteBuilder<void>(
-        pageBuilder:
-            (
-              BuildContext context,
-              Animation<double> animation,
-              Animation<double> secondaryAnimation,
-            ) {
-              return const Placeholder();
-            },
+    unawaited(
+      Navigator.push(
+        theContext,
+        PageRouteBuilder<void>(
+          pageBuilder:
+              (
+                BuildContext context,
+                Animation<double> animation,
+                Animation<double> secondaryAnimation,
+              ) {
+                return const Placeholder();
+              },
+        ),
       ),
     );
     await tester
@@ -537,17 +538,19 @@ void main() {
         ),
       ),
     );
-    Navigator.push(
-      theContext,
-      PageRouteBuilder<void>(
-        pageBuilder:
-            (
-              BuildContext context,
-              Animation<double> animation,
-              Animation<double> secondaryAnimation,
-            ) {
-              return const Placeholder();
-            },
+    unawaited(
+      Navigator.push(
+        theContext,
+        PageRouteBuilder<void>(
+          pageBuilder:
+              (
+                BuildContext context,
+                Animation<double> animation,
+                Animation<double> secondaryAnimation,
+              ) {
+                return const Placeholder();
+              },
+        ),
       ),
     );
     await tester.pump();
@@ -569,17 +572,19 @@ void main() {
         ),
       ),
     );
-    Navigator.push(
-      theContext,
-      PageRouteBuilder<void>(
-        pageBuilder:
-            (
-              BuildContext context,
-              Animation<double> animation,
-              Animation<double> secondaryAnimation,
-            ) {
-              return const Placeholder();
-            },
+    unawaited(
+      Navigator.push(
+        theContext,
+        PageRouteBuilder<void>(
+          pageBuilder:
+              (
+                BuildContext context,
+                Animation<double> animation,
+                Animation<double> secondaryAnimation,
+              ) {
+                return const Placeholder();
+              },
+        ),
       ),
     );
     await tester.pump();