[flutter_tts] Add integration tests for the supported TTS APIs (#1041)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: seungsoo47

packages/flutter_tts/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.7.0
+
+* Return a boolean from `isLanguageAvailable` to match the behavior of other platforms.
+* Add integration tests for the supported TTS APIs.
+
 ## 1.6.0
 
 * Update flutter_tts 4.2.0 to 4.2.5.

packages/flutter_tts/README.md

@@ -11,7 +11,7 @@ This package is not an _endorsed_ implementation of `flutter_tts`. Therefore, yo
 ```yaml
 dependencies:
   flutter_tts: ^4.2.5
-  flutter_tts_tizen: ^1.6.0
+  flutter_tts_tizen: ^1.7.0
 ```
 
 Then you can import `flutter_tts` in your Dart code:

packages/flutter_tts/example/integration_test/flutter_tts_test.dart

@@ -5,10 +5,90 @@ import 'package:integration_test/integration_test.dart';
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
 
-  testWidgets('Can speak', (WidgetTester tester) async {
-    final flutterTts = FlutterTts();
+  late FlutterTts flutterTts;
+
+  setUpAll(() async {
+    flutterTts = FlutterTts();
+    // Give the native TTS engine time to initialize.
     await Future<void>.delayed(const Duration(seconds: 2));
-    var result = await flutterTts.speak('Hello, world!');
-    expect(result, 1);
+  });
+
+  tearDown(() async {
+    await flutterTts.stop();
+  });
+
+  testWidgets('speak returns 1', (WidgetTester tester) async {
+    expect(await flutterTts.speak('Hello, world!'), 1);
+  });
+
+  testWidgets('stop returns 1', (WidgetTester tester) async {
+    expect(await flutterTts.stop(), 1);
+  });
+
+  testWidgets('getLanguages returns a non-empty list', (
+    WidgetTester tester,
+  ) async {
+    final languages = await flutterTts.getLanguages;
+    expect(languages, isNotNull);
+    expect(languages, isNotEmpty);
+  });
+
+  testWidgets('isLanguageAvailable is true for a supported language', (
+    WidgetTester tester,
+  ) async {
+    final languages = (await flutterTts.getLanguages as List).cast<String>();
+    expect(languages, isNotEmpty);
+    expect(await flutterTts.isLanguageAvailable(languages.first), isTrue);
+  });
+
+  testWidgets('setLanguage returns 1 for a supported language', (
+    WidgetTester tester,
+  ) async {
+    final languages = (await flutterTts.getLanguages as List).cast<String>();
+    expect(languages, isNotEmpty);
+    expect(await flutterTts.setLanguage(languages.first), 1);
+  });
+
+  testWidgets('getVoices returns a non-empty list', (
+    WidgetTester tester,
+  ) async {
+    final voices = await flutterTts.getVoices;
+    expect(voices, isNotNull);
+    expect(voices, isNotEmpty);
+  });
+
+  testWidgets('getDefaultVoice returns a voice', (WidgetTester tester) async {
+    expect(await flutterTts.getDefaultVoice, isNotNull);
+  });
+
+  testWidgets('setVoice returns 1', (WidgetTester tester) async {
+    final voices = (await flutterTts.getVoices as List).cast<Map>();
+    expect(voices, isNotEmpty);
+    final voice = voices.first;
+    expect(
+      await flutterTts.setVoice(<String, String>{
+        'name': voice['name'].toString(),
+        'locale': voice['locale'].toString(),
+      }),
+      1,
+    );
+  });
+
+  testWidgets('setSpeechRate returns 1', (WidgetTester tester) async {
+    expect(await flutterTts.setSpeechRate(0.5), 1);
+  });
+
+  testWidgets('setVolume returns 1', (WidgetTester tester) async {
+    expect(await flutterTts.setVolume(1), 1);
+  });
+
+  testWidgets('getMaxSpeechInputLength is positive', (
+    WidgetTester tester,
+  ) async {
+    // tts_get_max_text_size requires the ready state; stop() ensures it.
+    await flutterTts.stop();
+    final maxLength = await flutterTts.getMaxSpeechInputLength;
+    expect(maxLength, isNotNull);
+    expect(maxLength, greaterThan(0));
   });
 }

packages/flutter_tts/pubspec.yaml

@@ -2,7 +2,7 @@ name: flutter_tts_tizen
 description: The Tizen implementation of flutter_tts plugin.
 homepage: https://github.com/flutter-tizen/plugins
 repository: https://github.com/flutter-tizen/plugins/tree/master/packages/flutter_tts
-version: 1.6.0
+version: 1.7.0
 
 environment:
   sdk: ">=3.1.0 <4.0.0"

packages/flutter_tts/tizen/src/flutter_tts_tizen_plugin.cc

@@ -298,11 +298,11 @@ class FlutterTtsTizenPlugin : public flutter::Plugin {
     if (std::holds_alternative<std::string>(arguments)) {
       std::string language = std::move(std::get<std::string>(arguments));
       if (!language.empty() && tts_->IsLanguageAvailable(language)) {
-        SendResult(flutter::EncodableValue(1));
+        SendResult(flutter::EncodableValue(true));
         return;
       }
     }
-    SendResult(flutter::EncodableValue(0));
+    SendResult(flutter::EncodableValue(false));
   }
 
   void SendResult(const flutter::EncodableValue &result) {