[GitHub] [beam] Malarg commented on a diff in pull request #25034: Test loading URLs

[GitBox <gi...@apache.org>]

Malarg commented on code in PR #25034:
URL: https://github.com/apache/beam/pull/25034#discussion_r1073112162


##########
playground/frontend/build.gradle:
##########
@@ -183,10 +183,17 @@ ext.deleteFilesByRegExp = { re ->
 }
 
 tasks.register("integrationTest") {
+  dependsOn("integrationTest_initial_urls")
   dependsOn("integrationTest_standalone_change_example_sdk_run")
   dependsOn("integrationTest_standalone_miscellaneous_ui")
 }
 
+tasks.register("integrationTest_initial_urls") {

Review Comment:
   will we add `standalone` to naming? Suggest add or remove from all tests



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';

Review Comment:
   Suggest take from embedded playground path file



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';
+const _paths = [_embeddedPath, _standalonePath];
+
+const _fullViewOptionsMap = {
+  'readonly': 'readonly1,readonly2',
+  'unfold': 'unfold1,unfold2',
+};
+final _croppedViewOptionsMap = {
+  ..._fullViewOptionsMap,
+  'show': 'show',
+};
+
+final _fullViewOptions = _mapToQueryString(_fullViewOptionsMap);
+final _croppedViewOptions = _mapToQueryString(_croppedViewOptionsMap);
+
+Future<void> _testEmbeddedRoot(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse(_embeddedPath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneRoot(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountJava.path,

Review Comment:
   Would be better to generalize interface of obtaining info about examples. I suggest to make factory of examples, which will return required example by enum



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';
+const _paths = [_embeddedPath, _standalonePath];
+
+const _fullViewOptionsMap = {
+  'readonly': 'readonly1,readonly2',
+  'unfold': 'unfold1,unfold2',
+};
+final _croppedViewOptionsMap = {
+  ..._fullViewOptionsMap,
+  'show': 'show',
+};
+
+final _fullViewOptions = _mapToQueryString(_fullViewOptionsMap);
+final _croppedViewOptions = _mapToQueryString(_croppedViewOptionsMap);
+
+Future<void> _testEmbeddedRoot(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse(_embeddedPath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneRoot(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountJava.path,
+    java,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse(_standalonePath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testEmbeddedSdkOnly(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse('$_embeddedPath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneSdkOnly(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(

Review Comment:
   this test will be broken if default example will be changed



##########
playground/frontend/lib/main.dart:
##########
@@ -43,7 +43,7 @@ void main() async {
   // Router API specific initialization.
   final pageStack = GetIt.instance.get<PageStack>();
   final routerDelegate = BeamRouterDelegate(pageStack);
-  final routeInformationParser = PlaygroundRouteInformationParser();
+  final rip = GetIt.instance.get<PageStackRouteInformationParser>();

Review Comment:
   may be `routeParser`? My first association is rest in peace 



##########
playground/frontend/playground_components_dev/lib/src/widget_tester.dart:
##########
@@ -50,4 +52,28 @@ extension WidgetTesterExtension on WidgetTester {
     final context = element(find.codeField());
     return context.read<PlaygroundController>();
   }
+
+  Future<void> navigateAndSettle(Uri url) async {
+    print(url);
+    await _navigate(url);
+    await Future.delayed(const Duration(seconds:1));
+    await pumpAndSettle();
+
+    await Future.delayed(const Duration(seconds: 1));
+    await pumpAndSettle();
+  }
+
+  Future<void> _navigate(Uri uri) async {
+    final rip = GetIt.instance.get<PageStackRouteInformationParser>();

Review Comment:
   `routeParser`



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';

Review Comment:
   suggest take from standalone playground path file



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';

Review Comment:
   unused import



##########
playground/frontend/lib/main.dart:
##########
@@ -43,7 +43,7 @@ void main() async {
   // Router API specific initialization.
   final pageStack = GetIt.instance.get<PageStack>();
   final routerDelegate = BeamRouterDelegate(pageStack);
-  final routeInformationParser = PlaygroundRouteInformationParser();
+  final rip = GetIt.instance.get<PageStackRouteInformationParser>();

Review Comment:
   also unused import on 33 row



##########
playground/frontend/lib/main.dart:
##########
@@ -43,7 +43,7 @@ void main() async {
   // Router API specific initialization.
   final pageStack = GetIt.instance.get<PageStack>();
   final routerDelegate = BeamRouterDelegate(pageStack);
-  final routeInformationParser = PlaygroundRouteInformationParser();
+  final rip = GetIt.instance.get<PageStackRouteInformationParser>();

Review Comment:
   also I think we can make extension on get it to make calls shorter



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';
+const _paths = [_embeddedPath, _standalonePath];
+
+const _fullViewOptionsMap = {
+  'readonly': 'readonly1,readonly2',
+  'unfold': 'unfold1,unfold2',
+};
+final _croppedViewOptionsMap = {
+  ..._fullViewOptionsMap,
+  'show': 'show',
+};
+
+final _fullViewOptions = _mapToQueryString(_fullViewOptionsMap);
+final _croppedViewOptions = _mapToQueryString(_croppedViewOptionsMap);
+
+Future<void> _testEmbeddedRoot(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse(_embeddedPath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneRoot(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountJava.path,
+    java,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse(_standalonePath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testEmbeddedSdkOnly(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse('$_embeddedPath?sdk=go'),

Review Comment:
   there are a lot of `Uri.parse` calls in the file with different params. It also could be generalized with builder.



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';
+const _paths = [_embeddedPath, _standalonePath];
+
+const _fullViewOptionsMap = {
+  'readonly': 'readonly1,readonly2',
+  'unfold': 'unfold1,unfold2',
+};
+final _croppedViewOptionsMap = {
+  ..._fullViewOptionsMap,
+  'show': 'show',
+};
+
+final _fullViewOptions = _mapToQueryString(_fullViewOptionsMap);
+final _croppedViewOptions = _mapToQueryString(_croppedViewOptionsMap);
+
+Future<void> _testEmbeddedRoot(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse(_embeddedPath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneRoot(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountJava.path,
+    java,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse(_standalonePath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testEmbeddedSdkOnly(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse('$_embeddedPath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneSdkOnly(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountGo.path,
+    go,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse('$_standalonePath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testCatalogDefaultExampleLoader(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountGo.path,
+    go,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse('$_standalonePath?sdk=go&default=true'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testContentExampleLoader(WidgetTester wt) async {
+  final content = await Examples.getFullTextByPath(ExampleGo.path);
+
+  for (final path in _paths) {
+    final files = jsonEncode([
+      {'content': content, 'isMain': true}
+    ]);
+    await wt.navigateAndSettle(
+      Uri.parse(
+        '$path?sdk=go&files=${Uri.encodeComponent(files)}&$_fullViewOptions',
+      ),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.fullVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testEmptyExampleLoader(WidgetTester wt) async {
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&empty=true'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, '');
+  }
+}
+
+Future<void> _testHttpExampleLoader(WidgetTester wt) async {
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_fullViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.fullVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testStandardExampleLoader(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    WordCountGo.path,
+    go,
+  );
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&path=${WordCountGo.dbPath}'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, visibleText);
+  }
+}
+
+Future<void> _testUserSharedExampleLoader(WidgetTester wt) async {
+  final template = await Examples.getFullTextByPath(ExampleGo.path);
+  final tail = '\n//${DateTime.now().millisecondsSinceEpoch}';
+  final content = '$template$tail';
+
+  final exampleCache = wt.findPlaygroundController().exampleCache;
+  final snippetId = await exampleCache.saveSnippet(
+    files: [SnippetFile(content: content, isMain: false, name: 'name')],
+    sdk: Sdk.go,
+    pipelineOptions: 'a=b',
+  );
+
+  print('Created user-shared example ID: $snippetId');
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&shared=$snippetId&$_fullViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, '${ExampleGo.fullVisibleText}$tail');
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testMultipleExamples(WidgetTester wt) async {
+  final javaVisibleText = await Examples.getVisibleTextByPath(
+    AggregationMaxJava.path,
+    java,
+  );
+  const goVisibleText = ExampleGo.fullVisibleText;
+
+  final examplesList = [
+    {
+      'sdk': Sdk.java.id,
+      'path': AggregationMaxJava.dbPath,
+      ..._fullViewOptionsMap,
+    },
+    {
+      'sdk': Sdk.go.id,
+      'url': ExampleGo.url,
+      ..._fullViewOptionsMap,
+    },
+  ];
+  final examples = jsonEncode(examplesList);
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&examples=$examples'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, goVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    final playgroundController = wt.findPlaygroundController();
+    playgroundController.setSdk(Sdk.java);
+    await wt.pumpAndSettle();
+
+    _expectSdk(wt, Sdk.java);
+    _expectText(wt, javaVisibleText);
+  }
+}
+
+void _expectSdk(WidgetTester wt, Sdk sdk) {
+  final controller = wt.findPlaygroundController();
+  expect(controller.sdk, sdk);
+}
+
+void _expectText(WidgetTester wt, String visibleText) {
+  final controller = wt.findOneCodeController();
+  expect(controller.text, visibleText);
+}
+
+/// Checks that the example contains:
+/// - at least two 'editable' substrings, and they are editable,
+/// - at least two 'readonly' substrings, and they are read-only.
+Future<void> _expectEditableAndReadOnly(WidgetTester wt) async {
+  final controller = wt.findOneCodeController();
+
+  for (int i = 0; i < 2; i++) {
+    controller.value = controller.value.select('editable')!;
+
+    final edited1 = controller.value.typed('');

Review Comment:
   edited1?



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';
+const _paths = [_embeddedPath, _standalonePath];
+
+const _fullViewOptionsMap = {
+  'readonly': 'readonly1,readonly2',
+  'unfold': 'unfold1,unfold2',
+};
+final _croppedViewOptionsMap = {
+  ..._fullViewOptionsMap,
+  'show': 'show',
+};
+
+final _fullViewOptions = _mapToQueryString(_fullViewOptionsMap);
+final _croppedViewOptions = _mapToQueryString(_croppedViewOptionsMap);
+
+Future<void> _testEmbeddedRoot(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse(_embeddedPath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneRoot(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountJava.path,
+    java,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse(_standalonePath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testEmbeddedSdkOnly(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse('$_embeddedPath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneSdkOnly(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountGo.path,
+    go,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse('$_standalonePath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testCatalogDefaultExampleLoader(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountGo.path,
+    go,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse('$_standalonePath?sdk=go&default=true'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testContentExampleLoader(WidgetTester wt) async {
+  final content = await Examples.getFullTextByPath(ExampleGo.path);
+
+  for (final path in _paths) {
+    final files = jsonEncode([
+      {'content': content, 'isMain': true}
+    ]);
+    await wt.navigateAndSettle(
+      Uri.parse(
+        '$path?sdk=go&files=${Uri.encodeComponent(files)}&$_fullViewOptions',
+      ),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.fullVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testEmptyExampleLoader(WidgetTester wt) async {
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&empty=true'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, '');
+  }
+}
+
+Future<void> _testHttpExampleLoader(WidgetTester wt) async {
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_fullViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.fullVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testStandardExampleLoader(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    WordCountGo.path,
+    go,
+  );
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&path=${WordCountGo.dbPath}'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, visibleText);
+  }
+}
+
+Future<void> _testUserSharedExampleLoader(WidgetTester wt) async {
+  final template = await Examples.getFullTextByPath(ExampleGo.path);
+  final tail = '\n//${DateTime.now().millisecondsSinceEpoch}';
+  final content = '$template$tail';
+
+  final exampleCache = wt.findPlaygroundController().exampleCache;
+  final snippetId = await exampleCache.saveSnippet(
+    files: [SnippetFile(content: content, isMain: false, name: 'name')],
+    sdk: Sdk.go,
+    pipelineOptions: 'a=b',
+  );
+
+  print('Created user-shared example ID: $snippetId');
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&shared=$snippetId&$_fullViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, '${ExampleGo.fullVisibleText}$tail');
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testMultipleExamples(WidgetTester wt) async {
+  final javaVisibleText = await Examples.getVisibleTextByPath(
+    AggregationMaxJava.path,
+    java,
+  );
+  const goVisibleText = ExampleGo.fullVisibleText;
+
+  final examplesList = [
+    {
+      'sdk': Sdk.java.id,
+      'path': AggregationMaxJava.dbPath,
+      ..._fullViewOptionsMap,
+    },
+    {
+      'sdk': Sdk.go.id,
+      'url': ExampleGo.url,
+      ..._fullViewOptionsMap,
+    },
+  ];
+  final examples = jsonEncode(examplesList);
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&examples=$examples'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, goVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    final playgroundController = wt.findPlaygroundController();
+    playgroundController.setSdk(Sdk.java);
+    await wt.pumpAndSettle();
+
+    _expectSdk(wt, Sdk.java);
+    _expectText(wt, javaVisibleText);
+  }
+}
+
+void _expectSdk(WidgetTester wt, Sdk sdk) {
+  final controller = wt.findPlaygroundController();
+  expect(controller.sdk, sdk);
+}
+
+void _expectText(WidgetTester wt, String visibleText) {
+  final controller = wt.findOneCodeController();
+  expect(controller.text, visibleText);
+}
+
+/// Checks that the example contains:
+/// - at least two 'editable' substrings, and they are editable,
+/// - at least two 'readonly' substrings, and they are read-only.
+Future<void> _expectEditableAndReadOnly(WidgetTester wt) async {
+  final controller = wt.findOneCodeController();
+
+  for (int i = 0; i < 2; i++) {
+    controller.value = controller.value.select('editable')!;
+
+    final edited1 = controller.value.typed('');
+    controller.value = edited1;
+    await wt.pumpAndSettle();
+    expect(controller.value, edited1, reason: 'Cannot edit an editable line');
+
+    controller.value = controller.value.select('readonly')!.typed('');
+    await wt.pumpAndSettle();
+    expect(controller.value, edited1, reason: 'Can edit a read-only line');
+  }
+}
+
+/// Checks that every character in the editor is read-only.
+void _expectReadOnly(WidgetTester wt) {
+  final controller = wt.findOneCodeController();
+  final value = controller.value;
+  final text = controller.text;
+
+  for (int i = text.length; --i >= 0;) {

Review Comment:
   better to move decrement to third part of cycle



##########
playground/frontend/integration_test/initial_urls_test.dart:
##########
@@ -0,0 +1,315 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_code_editor/flutter_code_editor.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:highlight/languages/go.dart';
+import 'package:highlight/languages/java.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:playground_components/playground_components.dart';
+import 'package:playground_components_dev/playground_components_dev.dart';
+
+import 'common/common.dart';
+
+// This test loads the app with most of the startup URL combinations.
+// They cannot be tested directly due to a Flutter bug:
+//     https://github.com/flutter/flutter/issues/118028
+// So the test performs in-app navigation to these URLs.
+// Many state objects are re-created this way, but not all,
+// so the test is not clean.
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  testWidgets('Initial URLs', (WidgetTester wt) async {
+    await init(wt);
+
+    await _testEmbeddedRoot(wt);
+    await _testStandaloneRoot(wt);
+
+    await _testEmbeddedSdkOnly(wt);
+    await _testStandaloneSdkOnly(wt);
+
+    await _testCatalogDefaultExampleLoader(wt);
+    await _testContentExampleLoader(wt);
+    await _testEmptyExampleLoader(wt);
+    await _testHttpExampleLoader(wt);
+    await _testStandardExampleLoader(wt);
+    await _testUserSharedExampleLoader(wt);
+
+    await _testMultipleExamples(wt);
+  });
+}
+
+const _embeddedPath = '/embedded';
+const _standalonePath = '/';
+const _paths = [_embeddedPath, _standalonePath];
+
+const _fullViewOptionsMap = {
+  'readonly': 'readonly1,readonly2',
+  'unfold': 'unfold1,unfold2',
+};
+final _croppedViewOptionsMap = {
+  ..._fullViewOptionsMap,
+  'show': 'show',
+};
+
+final _fullViewOptions = _mapToQueryString(_fullViewOptionsMap);
+final _croppedViewOptions = _mapToQueryString(_croppedViewOptionsMap);
+
+Future<void> _testEmbeddedRoot(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse(_embeddedPath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneRoot(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountJava.path,
+    java,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse(_standalonePath),
+  );
+  _expectSdk(wt, Sdk.java);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testEmbeddedSdkOnly(WidgetTester wt) async {
+  await wt.navigateAndSettle(
+    Uri.parse('$_embeddedPath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, '');
+}
+
+Future<void> _testStandaloneSdkOnly(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountGo.path,
+    go,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse('$_standalonePath?sdk=go'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testCatalogDefaultExampleLoader(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    MinimalWordCountGo.path,
+    go,
+  );
+
+  await wt.navigateAndSettle(
+    Uri.parse('$_standalonePath?sdk=go&default=true'),
+  );
+  _expectSdk(wt, Sdk.go);
+  _expectText(wt, visibleText);
+}
+
+Future<void> _testContentExampleLoader(WidgetTester wt) async {
+  final content = await Examples.getFullTextByPath(ExampleGo.path);
+
+  for (final path in _paths) {
+    final files = jsonEncode([
+      {'content': content, 'isMain': true}
+    ]);
+    await wt.navigateAndSettle(
+      Uri.parse(
+        '$path?sdk=go&files=${Uri.encodeComponent(files)}&$_fullViewOptions',
+      ),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.fullVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testEmptyExampleLoader(WidgetTester wt) async {
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&empty=true'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, '');
+  }
+}
+
+Future<void> _testHttpExampleLoader(WidgetTester wt) async {
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_fullViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.fullVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testStandardExampleLoader(WidgetTester wt) async {
+  final visibleText = await Examples.getVisibleTextByPath(
+    WordCountGo.path,
+    go,
+  );
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&path=${WordCountGo.dbPath}'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, visibleText);
+  }
+}
+
+Future<void> _testUserSharedExampleLoader(WidgetTester wt) async {
+  final template = await Examples.getFullTextByPath(ExampleGo.path);
+  final tail = '\n//${DateTime.now().millisecondsSinceEpoch}';
+  final content = '$template$tail';
+
+  final exampleCache = wt.findPlaygroundController().exampleCache;
+  final snippetId = await exampleCache.saveSnippet(
+    files: [SnippetFile(content: content, isMain: false, name: 'name')],
+    sdk: Sdk.go,
+    pipelineOptions: 'a=b',
+  );
+
+  print('Created user-shared example ID: $snippetId');
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&shared=$snippetId&$_fullViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, '${ExampleGo.fullVisibleText}$tail');
+    await _expectEditableAndReadOnly(wt);
+
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&url=${ExampleGo.url}&$_croppedViewOptions'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, ExampleGo.croppedVisibleText);
+    _expectReadOnly(wt);
+  }
+}
+
+Future<void> _testMultipleExamples(WidgetTester wt) async {
+  final javaVisibleText = await Examples.getVisibleTextByPath(
+    AggregationMaxJava.path,
+    java,
+  );
+  const goVisibleText = ExampleGo.fullVisibleText;
+
+  final examplesList = [
+    {
+      'sdk': Sdk.java.id,
+      'path': AggregationMaxJava.dbPath,
+      ..._fullViewOptionsMap,
+    },
+    {
+      'sdk': Sdk.go.id,
+      'url': ExampleGo.url,
+      ..._fullViewOptionsMap,
+    },
+  ];
+  final examples = jsonEncode(examplesList);
+
+  for (final path in _paths) {
+    await wt.navigateAndSettle(
+      Uri.parse('$path?sdk=go&examples=$examples'),
+    );
+    _expectSdk(wt, Sdk.go);
+    _expectText(wt, goVisibleText);
+    await _expectEditableAndReadOnly(wt);
+
+    final playgroundController = wt.findPlaygroundController();
+    playgroundController.setSdk(Sdk.java);
+    await wt.pumpAndSettle();
+
+    _expectSdk(wt, Sdk.java);
+    _expectText(wt, javaVisibleText);
+  }
+}
+
+void _expectSdk(WidgetTester wt, Sdk sdk) {
+  final controller = wt.findPlaygroundController();
+  expect(controller.sdk, sdk);
+}
+
+void _expectText(WidgetTester wt, String visibleText) {
+  final controller = wt.findOneCodeController();
+  expect(controller.text, visibleText);
+}
+
+/// Checks that the example contains:
+/// - at least two 'editable' substrings, and they are editable,
+/// - at least two 'readonly' substrings, and they are read-only.
+Future<void> _expectEditableAndReadOnly(WidgetTester wt) async {
+  final controller = wt.findOneCodeController();
+
+  for (int i = 0; i < 2; i++) {

Review Comment:
   2 is a magic number here



##########
playground/frontend/playground_components_dev/lib/src/widget_tester.dart:
##########
@@ -50,4 +52,28 @@ extension WidgetTesterExtension on WidgetTester {
     final context = element(find.codeField());
     return context.read<PlaygroundController>();
   }
+
+  Future<void> navigateAndSettle(Uri url) async {
+    print(url);
+    await _navigate(url);
+    await Future.delayed(const Duration(seconds:1));
+    await pumpAndSettle();
+
+    await Future.delayed(const Duration(seconds: 1));
+    await pumpAndSettle();

Review Comment:
   Explain, please. Why is it required?



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