[cameraX] Add integration test for availableCameras (#7156)

* Add integration test

* Add integration test

Author: camsim99

packages/camera/camera_android_camerax/CHANGELOG.md

@@ -10,3 +10,4 @@
 * Changes instance manager to allow the separate creation of identical objects.
 * Adds Preview and Surface classes, along with other methods needed to implement camera preview.
 * Adds implementation of availableCameras()
+* Adds integration test to plugin.

packages/camera/camera_android_camerax/example/integration_test/integration_test.dart

@@ -2,11 +2,27 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:camera_android_camerax/camera_android_camerax.dart';
+import 'package:camera_platform_interface/camera_platform_interface.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
 
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
 
-  testWidgets('placeholder test', (WidgetTester tester) async {});
+  setUpAll(() async {
+    CameraPlatform.instance = AndroidCameraCameraX();
+  });
+
+  testWidgets('availableCameras only supports valid back or front cameras',
+      (WidgetTester tester) async {
+    final List<CameraDescription> availableCameras =
+        await CameraPlatform.instance.availableCameras();
+
+    for (final CameraDescription cameraDescription in availableCameras) {
+      expect(
+          cameraDescription.lensDirection, isNot(CameraLensDirection.external));
+      expect(cameraDescription.sensorOrientation, anyOf(0, 90, 180, 270));
+    }
+  });
 }

packages/camera/camera_android_camerax/pubspec.yaml

@@ -21,6 +21,8 @@ dependencies:
   camera_platform_interface: ^2.2.0
   flutter:
     sdk: flutter
+  integration_test:
+    sdk: flutter
   stream_transform: ^2.1.0
 
 dev_dependencies: