[Gallery] Fix directory structure (#312)

gallery/test/pages/home_test.dart

@@ -0,0 +1,54 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gallery/data/gallery_options.dart';
+import 'package:gallery/l10n/gallery_localizations.dart';
+import 'package:gallery/pages/backdrop.dart';
+
+void main() {
+  testWidgets('Home page hides settings semantics when closed', (tester) async {
+    final animationController = AnimationController(
+      duration: Duration(milliseconds: 1),
+      vsync: const TestVSync(),
+    );
+    final isSettingsOpen = ValueNotifier(false);
+    await tester.pumpWidget(
+      MaterialApp(
+        localizationsDelegates: [GalleryLocalizations.delegate],
+        home: ModelBinding(
+          initialModel: GalleryOptions(
+            textScaleFactor: 1.0,
+          ),
+          child: Backdrop(
+            frontLayer: Text('Front'),
+            backLayer: Text('Back'),
+            controller: animationController,
+            isSettingsOpenNotifier: isSettingsOpen,
+            openSettingsAnimation: animationController,
+          ),
+        ),
+      ),
+    );
+    await tester.pump(Duration(seconds: 1));
+
+    expect(find.bySemanticsLabel('Settings'), findsOneWidget);
+    expect(find.bySemanticsLabel('Close settings'), findsNothing);
+    expect(tester.getSemantics(find.text('Back')).label, 'Back');
+    expect(tester.getSemantics(find.text('Front')).label, '');
+
+    await tester.tap(find.bySemanticsLabel('Settings'));
+    await tester.pump(Duration(seconds: 1));
+
+    // The test no longer finds Setting and Close settings since the semantics
+    // are excluded when settings mode is activated.
+    // This was done so people could ready the settings page from top to
+    // bottom by utilizing an invisible widget within the Settings Page.
+    expect(tester.getSemantics(find.text('Back')).owner, null);
+    expect(tester.getSemantics(find.text('Front')).label, 'Front');
+
+    animationController.dispose();
+  });
+}

gallery/test/widget_test.dart

@@ -0,0 +1,5 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+void main() {}