Resolved additional feedback

Author: mvanbeusekom

packages/camera/camera_platform_interface/lib/src/utils/utils.dart

@@ -0,0 +1,14 @@
+import 'package:camera_platform_interface/camera_platform_interface.dart';
+
+/// Parses a string into a corresponding CameraLensDirection.
+CameraLensDirection parseCameraLensDirection(String string) {
+  switch (string) {
+    case 'front':
+      return CameraLensDirection.front;
+    case 'back':
+      return CameraLensDirection.back;
+    case 'external':
+      return CameraLensDirection.external;
+  }
+  throw ArgumentError('Unknown CameraLensDirection value');
+}

packages/camera/camera_platform_interface/test/utils/utils_test.dart

@@ -0,0 +1,33 @@
+import 'package:camera_platform_interface/camera_platform_interface.dart';
+import 'package:camera_platform_interface/src/utils/utils.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('Utility methods', () {
+    test(
+        'Should return CameraLensDirection when valid value is supplied when parsing camera lens direction',
+        () {
+      expect(
+        parseCameraLensDirection('back'),
+        CameraLensDirection.back,
+      );
+      expect(
+        parseCameraLensDirection('front'),
+        CameraLensDirection.front,
+      );
+      expect(
+        parseCameraLensDirection('external'),
+        CameraLensDirection.external,
+      );
+    });
+
+    test(
+        'Should throw ArgumentException when invalid value is supplied when parsing camera lens direction',
+        () {
+      expect(
+        () => parseCameraLensDirection('test'),
+        throwsA(isArgumentError),
+      );
+    });
+  });
+}