test screenshot integration

flutter/test/integrations/screenshot_integration_test.dart

@@ -0,0 +1,47 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+import 'package:sentry_flutter/src/integrations/screenshot_integration.dart';
+import 'package:sentry_flutter/src/integrations/widgets_binding_integration.dart';
+import 'package:sentry_flutter/src/screenshot/screenshot_attachment_processor.dart';
+
+import '../mocks.mocks.dart';
+
+/// Tests that require `WidgetsFlutterBinding.ensureInitialized();` not
+/// being called at all.
+void main() {
+  late Fixture fixture;
+
+  setUp(() {
+    fixture = Fixture();
+  });
+
+  test('screenshotIntegration creates screenshot processor', () async {
+    final integration = ScreenshotIntegration();
+
+    await integration(fixture.hub, fixture.options);
+
+    expect(
+        // ignore: invalid_use_of_internal_member
+        fixture.options.clientAttachmentProcessor
+            is ScreenshotAttachmentProcessor,
+        true);
+  });
+
+  test('screenshotIntegration close resets processor', () async {
+    final integration = ScreenshotIntegration();
+
+    await integration(fixture.hub, fixture.options);
+    await integration.close();
+
+    expect(
+        // ignore: invalid_use_of_internal_member
+        fixture.options.clientAttachmentProcessor
+            is ScreenshotAttachmentProcessor,
+        false);
+  });
+}
+
+class Fixture {
+  final hub = MockHub();
+  final options = SentryFlutterOptions();
+}