Add unit tests for AgentService, including createInbox method scenarios. (#6188)

Co-authored-by: gru-agent[bot] <185149714+gru-agent[bot]@users.noreply.github.com>

Author: gru-agent[bot]

src/server/services/agent/index.test.ts

@@ -0,0 +1,65 @@
+// @vitest-environment node
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { SessionModel } from '@/database/server/models/session';
+import { parseAgentConfig } from '@/server/globalConfig/parseDefaultAgent';
+
+import { AgentService } from './index';
+
+vi.mock('@/config/app', () => ({
+  appEnv: {
+    DEFAULT_AGENT_CONFIG: 'model=gpt-4;temperature=0.7',
+  },
+}));
+
+vi.mock('@/server/globalConfig/parseDefaultAgent', () => ({
+  parseAgentConfig: vi.fn(),
+}));
+
+vi.mock('@/database/server/models/session', () => ({
+  SessionModel: vi.fn(),
+}));
+
+describe('AgentService', () => {
+  let service: AgentService;
+  const mockDb = {} as any;
+  const mockUserId = 'test-user-id';
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    service = new AgentService(mockDb, mockUserId);
+  });
+
+  describe('createInbox', () => {
+    it('should create inbox with default agent config', async () => {
+      const mockConfig = { model: 'gpt-4', temperature: 0.7 };
+      const mockSessionModel = {
+        createInbox: vi.fn(),
+      };
+
+      (SessionModel as any).mockImplementation(() => mockSessionModel);
+      (parseAgentConfig as any).mockReturnValue(mockConfig);
+
+      await service.createInbox();
+
+      expect(SessionModel).toHaveBeenCalledWith(mockDb, mockUserId);
+      expect(parseAgentConfig).toHaveBeenCalledWith('model=gpt-4;temperature=0.7');
+      expect(mockSessionModel.createInbox).toHaveBeenCalledWith(mockConfig);
+    });
+
+    it('should create inbox with empty config if parseAgentConfig returns undefined', async () => {
+      const mockSessionModel = {
+        createInbox: vi.fn(),
+      };
+
+      (SessionModel as any).mockImplementation(() => mockSessionModel);
+      (parseAgentConfig as any).mockReturnValue(undefined);
+
+      await service.createInbox();
+
+      expect(SessionModel).toHaveBeenCalledWith(mockDb, mockUserId);
+      expect(parseAgentConfig).toHaveBeenCalledWith('model=gpt-4;temperature=0.7');
+      expect(mockSessionModel.createInbox).toHaveBeenCalledWith({});
+    });
+  });
+});