Tests for new image group type

Author: acoutts

packages/camera/camera_android/test/type_conversion_test.dart

@@ -57,4 +57,26 @@ void main() {
     });
     expect(cameraImage.format.group, ImageFormatGroup.yuv420);
   });
+
+  test('CameraImageData has ImageFormatGroup.nv21', () {
+    final CameraImageData cameraImage =
+        cameraImageFromPlatformData(<dynamic, dynamic>{
+      'format': 17,
+      'height': 1,
+      'width': 4,
+      'lensAperture': 1.8,
+      'sensorExposureTime': 9991324,
+      'sensorSensitivity': 92.0,
+      'planes': <dynamic>[
+        <dynamic, dynamic>{
+          'bytes': Uint8List.fromList(<int>[1, 2, 3, 4]),
+          'bytesPerPixel': 1,
+          'bytesPerRow': 4,
+          'height': 1,
+          'width': 4
+        }
+      ]
+    });
+    expect(cameraImage.format.group, ImageFormatGroup.nv21);
+  });
 }

packages/camera/camera_platform_interface/test/types/image_group_test.dart

@@ -11,6 +11,7 @@ void main() {
       expect(ImageFormatGroup.bgra8888.name(), 'bgra8888');
       expect(ImageFormatGroup.yuv420.name(), 'yuv420');
       expect(ImageFormatGroup.jpeg.name(), 'jpeg');
+      expect(ImageFormatGroup.nv21.name(), 'nv21');
       expect(ImageFormatGroup.unknown.name(), 'unknown');
     });
   });