[camera_platform_interface] Migrate to null safety (#3530)

* Migrate camera_platform_interface to null safety

* Added camera to the NNBD plugin list

* Correct version number

* Convert optional parameters to required for CameraInitializationEvent

* Convert CameraId in test to non-nullable

* Test for null instead of enforcing non-null

* Attempt to fix dependency problem building all plugins

* Mark google_maps_flutter as NNBD

* Depend on correct Dart SDK version

* Attempt to fix dependency problem building all plugins

* Attempt to fix dependency problem building all plugins

* Attempt to fix dependency problem building all plugins

* Attempt to fix dependency problem building all plugins

* Add camera_platform_interface to exclude list

* Exclude camera from nnbd and non-nnbd

* Remove mockito dependency

* Make sure enableAudio is default false

* Include left-hand type definition

* Removed unused import statement

Author: mvanbeusekom

packages/camera/camera_platform_interface/lib/src/method_channel/method_channel_camera.dart

@@ -59,7 +59,7 @@ class MethodChannelCamera extends CameraPlatform {
   @override
   Future<List<CameraDescription>> availableCameras() async {
     try {
-      final cameras = await _channel
+      final List<Map<dynamic, dynamic>>? cameras = await _channel
           .invokeListMethod<Map<dynamic, dynamic>>('availableCameras');
 
       if (cameras == null) {
@@ -82,7 +82,7 @@ class MethodChannelCamera extends CameraPlatform {
   Future<int> createCamera(
     CameraDescription cameraDescription,
     ResolutionPreset? resolutionPreset, {
-    bool enableAudio = true,
+    bool enableAudio = false,
   }) async {
     try {
       final reply = await _channel

packages/camera/camera_platform_interface/lib/src/platform_interface/camera_platform.dart

@@ -44,6 +44,8 @@ abstract class CameraPlatform extends PlatformInterface {
   }
 
   /// Completes with a list of available cameras.
+  ///
+  /// This method returns an empty list when no cameras are available.
   Future<List<CameraDescription>> availableCameras() {
     throw UnimplementedError('availableCameras() is not implemented.');
   }
@@ -52,7 +54,7 @@ abstract class CameraPlatform extends PlatformInterface {
   Future<int> createCamera(
     CameraDescription cameraDescription,
     ResolutionPreset? resolutionPreset, {
-    bool enableAudio = true,
+    bool enableAudio = false,
   }) {
     throw UnimplementedError('createCamera() is not implemented.');
   }

packages/camera/camera_platform_interface/pubspec.yaml

@@ -17,7 +17,6 @@ dev_dependencies:
   flutter_test:
     sdk: flutter
   async: ^2.5.0-nullsafety.3
-  mockito: ^5.0.0-nullsafety.5
   pedantic: ^1.10.0-nullsafety.3
 
 environment:

packages/camera/camera_platform_interface/test/camera_platform_interface_test.dart

@@ -6,8 +6,6 @@ import 'package:camera_platform_interface/camera_platform_interface.dart';
 import 'package:camera_platform_interface/src/method_channel/method_channel_camera.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:mockito/mockito.dart';
-import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
@@ -27,11 +25,6 @@ void main() {
       CameraPlatform.instance = ExtendsCameraPlatform();
     });
 
-    test('Can be mocked with `implements`', () {
-      final mock = MockCameraPlatform();
-      CameraPlatform.instance = mock;
-    });
-
     test(
         'Default implementation of availableCameras() should throw unimplemented error',
         () {
@@ -423,11 +416,4 @@ class ImplementsCameraPlatform implements CameraPlatform {
   dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
-class MockCameraPlatform extends Mock
-    with
-        // ignore: prefer_mixin
-        MockPlatformInterfaceMixin
-    implements
-        CameraPlatform {}
-
 class ExtendsCameraPlatform extends CameraPlatform {}

packages/camera/camera_platform_interface/test/method_channel/method_channel_camera_test.dart

@@ -51,7 +51,7 @@ void main() {
             arguments: {
               'cameraName': 'Test',
               'resolutionPreset': 'high',
-              'enableAudio': true
+              'enableAudio': false
             },
           ),
         ]);