tests: improve chat viewmodel tests(cv: 70)

test/dashbot/features/chat/viewmodel/chat_viewmodel_ai_flow_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:apidash/dashbot/providers/providers.dart';
+import 'package:apidash/dashbot/models/models.dart' show ChatMessage;
+import 'package:apidash/dashbot/repository/repository.dart';
+import 'package:apidash/dashbot/constants.dart';
+import 'package:apidash/models/models.dart';
+import 'package:apidash/dashbot/services/agent/prompt_builder.dart';
+import 'package:apidash/providers/settings_providers.dart';
+import 'package:apidash_core/apidash_core.dart';
+import 'package:apidash/providers/collection_providers.dart';
+import '../../../../providers/helpers.dart';
+
+/// AI-enabled flow tests for ChatViewmodel.
+///
+/// This file contains tests specifically for AI-enabled chat functionality,
+// A mock ChatRemoteRepository returning configurable responses
+class MockChatRemoteRepository extends ChatRemoteRepository {
+  String? mockResponse;
+  Exception? mockError;
+
+  @override
+  Future<String?> sendChat({required AIRequestModel request}) async {
+    if (mockError != null) throw mockError!;
+    return mockResponse;
+  }
+}
+
+class _PromptCaptureBuilder extends PromptBuilder {
+  final PromptBuilder _inner;
+  _PromptCaptureBuilder(this._inner);
+  String? lastSystemPrompt;
+
+  @override
+  String buildSystemPrompt(RequestModel? req, ChatMessageType type,
+      {String? overrideLanguage, List<ChatMessage> history = const []}) {
+    final r = _inner.buildSystemPrompt(req, type,
+        overrideLanguage: overrideLanguage, history: history);
+    lastSystemPrompt = r;
+    return r;
+  }
+
+  @override
+  String? detectLanguage(String text) => _inner.detectLanguage(text);
+
+  @override
+  String getUserMessageForTask(ChatMessageType type) =>
+      _inner.getUserMessageForTask(type);
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  late ProviderContainer container;
+  late MockChatRemoteRepository mockRepo;
+  late _PromptCaptureBuilder promptCapture;
+
+  setUp(() async {
+    await testSetUpTempDirForHive();
+  });
+
+  // Helper to obtain a default PromptBuilder by reading the real provider in a temp container
+  PromptBuilder basePromptBuilder() {
+    final temp = ProviderContainer();
+    final pb = temp.read(promptBuilderProvider);
+    temp.dispose();
+    return pb;
+  }
+
+  ProviderContainer createTestContainer(
+      {String? aiExplanation, String? actionsJson}) {
+    mockRepo = MockChatRemoteRepository();
+    if (aiExplanation != null) {
+      // Build a response optionally with actions
+      final actionsPart = actionsJson ?? '[]';
+      mockRepo.mockResponse =
+          '{"explanation":"$aiExplanation","actions":$actionsPart}';
+    }
+
+    // Proper AI model JSON matching AIRequestModel.fromJson keys
+    final aiModelJson = {
+      'modelApiProvider': 'openai',
+      'model': 'gpt-test',
+      'apiKey': 'sk-test',
+      'system_prompt': '',
+      'user_prompt': '',
+      'model_configs': [],
+      'stream': false,
+    };
+
+    final baseSettings = SettingsModel(defaultAIModel: aiModelJson);
+    promptCapture = _PromptCaptureBuilder(basePromptBuilder());
+
+    return createContainer(overrides: [
+      chatRepositoryProvider.overrideWithValue(mockRepo),
+      settingsProvider.overrideWith(
+          (ref) => ThemeStateNotifier(settingsModel: baseSettings)),
+      // Force no selected request so chat uses the stable 'global' session key
+      selectedRequestModelProvider.overrideWith((ref) => null),
+      promptBuilderProvider.overrideWith((ref) => promptCapture),
+    ]);
+  }
+
+  group('ChatViewmodel AI Enabled Flow', () {
+    test('processes valid AI explanation + actions list', () async {
+      container = createTestContainer(
+        aiExplanation: 'Here is your code',
+        actionsJson:
+            '[{"action":"other","target":"code","field":"generated","value":"print(\\"hi\\")"}]',
+      );
+      final vm = container.read(chatViewmodelProvider.notifier);
+
+      await vm.sendMessage(
+          text: 'Generate code', type: ChatMessageType.generateCode);
+
+      final msgs = vm.currentMessages;
+      // Expect exactly 2 messages: user + system response
+      expect(msgs.length, equals(2));
+      final user = msgs.first;
+      final system = msgs.last;
+      expect(user.role, MessageRole.user);
+      expect(system.role, MessageRole.system);
+      expect(system.actions, isNotNull);
+      expect(system.actions!.length, equals(1));
+      expect(system.content, contains('Here is your code'));
+      expect(promptCapture.lastSystemPrompt, isNotNull);
+      expect(promptCapture.lastSystemPrompt, contains('Generate'));
+    });
+
+    test('handles empty AI response (adds fallback message)', () async {
+      container = createTestContainer();
+      mockRepo.mockResponse = ''; // Explicit empty
+      final vm = container.read(chatViewmodelProvider.notifier);
+
+      await vm.sendMessage(
+          text: 'Explain', type: ChatMessageType.explainResponse);
+
+      final msgs = vm.currentMessages;
+      expect(msgs, isNotEmpty);
+      expect(msgs.last.content, contains('No response'));
+    });
+
+    test('handles null AI response (adds fallback message)', () async {
+      container = createTestContainer();
+      mockRepo.mockResponse = null; // Explicit null
+      final vm = container.read(chatViewmodelProvider.notifier);
+      await vm.sendMessage(text: 'Debug', type: ChatMessageType.debugError);
+      final msgs = vm.currentMessages;
+      expect(msgs, isNotEmpty);
+      expect(msgs.last.content, contains('No response'));
+    });
+
+    test('handles malformed actions field gracefully', () async {
+      container = createTestContainer();
+      mockRepo.mockResponse =
+          '{"explanation":"Something","actions":"not-a-list"}';
+      final vm = container.read(chatViewmodelProvider.notifier);
+      await vm.sendMessage(
+          text: 'Gen test', type: ChatMessageType.generateTest);
+      final msgs = vm.currentMessages;
+      expect(msgs, isNotEmpty);
+      final sys = msgs.last;
+      expect(sys.content, contains('Something'));
+    });
+
+    test('handles malformed top-level JSON gracefully (no crash, fallback)',
+        () async {
+      container = createTestContainer();
+      // This will cause MessageJson.safeParse to catch and ignore malformed content
+      mockRepo.mockResponse =
+          '{"explanation":"ok","actions": [ { invalid json }';
+      final vm = container.read(chatViewmodelProvider.notifier);
+      await vm.sendMessage(
+          text: 'Gen code', type: ChatMessageType.generateCode);
+      final msgs = vm.currentMessages;
+      expect(msgs.length, equals(2)); // user + system with raw content
+      expect(msgs.last.content, contains('explanation'));
+    });
+
+    test('handles missing explanation key (still stores raw response)',
+        () async {
+      container = createTestContainer();
+      mockRepo.mockResponse = '{"note":"Just a note","actions": []}';
+      final vm = container.read(chatViewmodelProvider.notifier);
+      await vm.sendMessage(
+          text: 'Explain', type: ChatMessageType.explainResponse);
+      final msgs = vm.currentMessages;
+      expect(msgs.length, equals(2));
+      expect(msgs.last.content, contains('note'));
+    });
+
+    test('catches repository exception and appends error system message',
+        () async {
+      container = createTestContainer();
+      mockRepo.mockError = Exception('boom');
+      final vm = container.read(chatViewmodelProvider.notifier);
+      await vm.sendMessage(text: 'Doc', type: ChatMessageType.generateDoc);
+      final msgs = vm.currentMessages;
+      expect(msgs, isNotEmpty);
+      expect(msgs.last.content, contains('Error:'));
+    });
+  });
+}