Add integration tests for wrapWidget

@@ -3,6 +3,7 @@
 ## 3.3.0
 
 - Add wrapWidget helper
+- Add integration tests for wrapWidget
 
 ## 3.2.1
 

@@ -252,6 +252,7 @@ class MyAppState extends State<MyApp> {
                   onPressed: printingInfo?.canShare ?? false ? _sharePdf : null,
                 ),
                 RaisedButton(
+                  key: const Key('screenshot'),
                   child: const Text('Print Screenshot'),
                   onPressed: (printingInfo?.canPrint ?? false) && !kIsWeb
                       ? _printScreen

@@ -17,6 +17,9 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_driver:
+    sdk: flutter
+  test:
 
 dependency_overrides:
   printing:

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'package:flutter_driver/driver_extension.dart';
+import 'package:printing_example/main.dart' as app;
+
+void main() {
+  // Enables flutter_driver extension
+  enableFlutterDriverExtension();
+
+  // Call the `main()` function of the app
+  app.main();
+}

+/*
+ * Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'package:flutter_driver/flutter_driver.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('wrapWidget integration tests', () {
+    FlutterDriver driver;
+
+    final SerializableFinder screenshotFinder = find.byValueKey('screenshot');
+
+    setUpAll(() async {
+      driver = await FlutterDriver.connect();
+    });
+
+    tearDownAll(() {
+      if (driver != null) {
+        driver.close();
+      }
+    });
+
+    test('renders Widget as Image', () async {
+      await driver.tap(screenshotFinder);
+    });
+  });
+}