Added controller tests for code coverage

Author: JuggerbAUT

test/chewie_controller_test.dart

@@ -0,0 +1,69 @@
+import 'package:chewie/chewie.dart';
+import 'package:chewie/src/helpers/fullscreen_controller.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:video_player/video_player.dart';
+
+void main() {
+  group('ChewieController', () {
+    late VideoPlayerController videoPlayerController;
+
+    setUp(() {
+      videoPlayerController = VideoPlayerController.networkUrl(
+        Uri.parse('https://example.com/video.mp4'),
+      );
+    });
+
+    test('sets useNativeWebFullscreen to true by default', () {
+      final controller = ChewieController(
+        videoPlayerController: videoPlayerController,
+      );
+
+      expect(controller.useNativeWebFullscreen, true);
+
+      controller.dispose();
+    });
+
+    test('assigns unique textureId to each controller', () {
+      final controller1 = ChewieController(
+        videoPlayerController: videoPlayerController,
+      );
+      final controller2 = ChewieController(
+        videoPlayerController: videoPlayerController,
+      );
+
+      expect(controller1.textureId, isNot(controller2.textureId));
+
+      controller1.dispose();
+      controller2.dispose();
+    });
+
+    test('toggleFullScreen toggles isFullScreen on non-web', () {
+      final controller = ChewieController(
+        videoPlayerController: videoPlayerController,
+      );
+
+      expect(controller.isFullScreen, false);
+      controller.toggleFullScreen();
+      expect(controller.isFullScreen, true);
+      controller.toggleFullScreen();
+      expect(controller.isFullScreen, false);
+
+      controller.dispose();
+    });
+
+    test('copyWith preserves useNativeWebFullscreen', () {
+      final controller = ChewieController(
+        videoPlayerController: videoPlayerController,
+        useNativeWebFullscreen: false,
+      );
+
+      expect(controller.useNativeWebFullscreen, false);
+
+      final copied = controller.copyWith(useNativeWebFullscreen: true);
+      expect(copied.useNativeWebFullscreen, true);
+
+      controller.dispose();
+      copied.dispose();
+    });
+  });
+}