test: improve test coverage

src/service/routes/auth.ts

@@ -144,7 +144,7 @@ router.get('/profile', async (req: Request, res: Response) => {
 
   const userVal = await db.findUser((req.user as User).username);
   if (!userVal) {
-    res.status(404).send('User not found').end();
+    res.status(404).send({ message: 'User not found' }).end();
     return;
   }
 

test/db/mongo/helper.test.ts

@@ -0,0 +1,315 @@
+import { describe, it, expect, afterEach, vi, beforeEach } from 'vitest';
+import { MongoClient } from 'mongodb';
+
+const mockCollection = {
+  find: vi.fn(),
+  findOne: vi.fn(),
+};
+
+const mockDb = {
+  collection: vi.fn(() => mockCollection),
+};
+
+const mockClient = {
+  connect: vi.fn().mockResolvedValue(undefined),
+  db: vi.fn(() => mockDb),
+};
+
+const mockToArray = vi.fn();
+
+vi.mock('mongodb', async () => {
+  const actual = await vi.importActual('mongodb');
+  return {
+    ...actual,
+    MongoClient: vi.fn(() => mockClient),
+  };
+});
+
+const mockGetDatabase = vi.fn();
+
+vi.mock('../../../src/config', () => ({
+  getDatabase: mockGetDatabase,
+}));
+
+const mockFromNodeProviderChain = vi.fn();
+
+vi.mock('@aws-sdk/credential-providers', () => ({
+  fromNodeProviderChain: mockFromNodeProviderChain,
+}));
+
+const mockMongoDBStore = vi.fn();
+
+vi.mock('connect-mongo', () => ({
+  default: mockMongoDBStore,
+}));
+
+describe('MongoDB Helper', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockCollection.find.mockReturnValue({ toArray: mockToArray });
+
+    // Clear cached db
+    vi.resetModules();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  describe('connect', () => {
+    it('should connect to MongoDB and return collection', async () => {
+      mockGetDatabase.mockReturnValue({
+        connectionString: 'mongodb://localhost:27017/testdb',
+        options: {},
+      });
+
+      const { connect } = await import('../../../src/db/mongo/helper');
+
+      const result = await connect('testCollection');
+
+      expect(MongoClient).toHaveBeenCalledWith('mongodb://localhost:27017/testdb', {});
+      expect(mockClient.connect).toHaveBeenCalled();
+      expect(mockClient.db).toHaveBeenCalled();
+      expect(mockDb.collection).toHaveBeenCalledWith('testCollection');
+      expect(result).toBe(mockCollection);
+    });
+
+    it('should reuse existing connection', async () => {
+      mockGetDatabase.mockReturnValue({
+        connectionString: 'mongodb://localhost:27017/testdb',
+        options: {},
+      });
+
+      const { connect } = await import('../../../src/db/mongo/helper');
+
+      await connect('collection1');
+
+      vi.clearAllMocks();
+      mockDb.collection.mockReturnValue(mockCollection);
+
+      await connect('collection2');
+
+      expect(MongoClient).not.toHaveBeenCalled();
+      expect(mockClient.connect).not.toHaveBeenCalled();
+      expect(mockDb.collection).toHaveBeenCalledWith('collection2');
+    });
+
+    it('should throw error when connection string is not provided', async () => {
+      mockGetDatabase.mockReturnValue({
+        connectionString: '',
+        options: {},
+      });
+
+      const { connect } = await import('../../../src/db/mongo/helper');
+
+      await expect(connect('testCollection')).rejects.toThrow(
+        'MongoDB connection string is not provided',
+      );
+    });
+
+    it('should throw error when connection string is undefined', async () => {
+      mockGetDatabase.mockReturnValue({
+        connectionString: undefined,
+        options: {},
+      });
+
+      const { connect } = await import('../../../src/db/mongo/helper');
+
+      await expect(connect('testCollection')).rejects.toThrow(
+        'MongoDB connection string is not provided',
+      );
+    });
+
+    it('should handle AWS credential provider', async () => {
+      const mockCredentialProvider = vi.fn();
+      mockFromNodeProviderChain.mockReturnValue(mockCredentialProvider);
+
+      mockGetDatabase.mockReturnValue({
+        connectionString: 'mongodb://localhost:27017/testdb',
+        options: {
+          authMechanismProperties: {
+            AWS_CREDENTIAL_PROVIDER: 'placeholder',
+          },
+        },
+      });
+
+      const { connect } = await import('../../../src/db/mongo/helper');
+
+      await connect('testCollection');
+
+      expect(mockFromNodeProviderChain).toHaveBeenCalled();
+      expect(MongoClient).toHaveBeenCalledWith(
+        'mongodb://localhost:27017/testdb',
+        expect.objectContaining({
+          authMechanismProperties: {
+            AWS_CREDENTIAL_PROVIDER: mockCredentialProvider,
+          },
+        }),
+      );
+    });
+
+    it('should pass options to MongoClient', async () => {
+      const options = {
+        maxPoolSize: 10,
+        minPoolSize: 5,
+        serverSelectionTimeoutMS: 5000,
+      };
+
+      mockGetDatabase.mockReturnValue({
+        connectionString: 'mongodb://localhost:27017/testdb',
+        options,
+      });
+
+      const { connect } = await import('../../../src/db/mongo/helper');
+
+      await connect('testCollection');
+
+      expect(MongoClient).toHaveBeenCalledWith('mongodb://localhost:27017/testdb', options);
+    });
+  });
+
+  describe('findDocuments', () => {
+    beforeEach(async () => {
+      mockGetDatabase.mockReturnValue({
+        connectionString: 'mongodb://localhost:27017/testdb',
+        options: {},
+      });
+    });
+
+    it('should find documents with default filter and options', async () => {
+      const mockDocs = [
+        { id: 1, name: 'test1' },
+        { id: 2, name: 'test2' },
+      ];
+      mockToArray.mockResolvedValue(mockDocs);
+
+      const { findDocuments } = await import('../../../src/db/mongo/helper');
+
+      const result = await findDocuments('testCollection');
+
+      expect(mockDb.collection).toHaveBeenCalledWith('testCollection');
+      expect(mockCollection.find).toHaveBeenCalledWith({}, {});
+      expect(mockToArray).toHaveBeenCalled();
+      expect(result).toEqual(mockDocs);
+    });
+
+    it('should find documents with custom filter', async () => {
+      const mockDocs = [{ id: 1, name: 'test1' }];
+      mockToArray.mockResolvedValue(mockDocs);
+
+      const { findDocuments } = await import('../../../src/db/mongo/helper');
+
+      const filter = { name: 'test1' };
+      const result = await findDocuments('testCollection', filter);
+
+      expect(mockCollection.find).toHaveBeenCalledWith(filter, {});
+      expect(result).toEqual(mockDocs);
+    });
+
+    it('should find documents with custom options', async () => {
+      const mockDocs = [{ id: 1, name: 'test1' }];
+      mockToArray.mockResolvedValue(mockDocs);
+
+      const { findDocuments } = await import('../../../src/db/mongo/helper');
+
+      const filter = { name: 'test1' };
+      const options = { projection: { _id: 0, name: 1 }, limit: 10 };
+      const result = await findDocuments('testCollection', filter, options);
+
+      expect(mockCollection.find).toHaveBeenCalledWith(filter, options);
+      expect(result).toEqual(mockDocs);
+    });
+
+    it('should return empty array when no documents found', async () => {
+      mockToArray.mockResolvedValue([]);
+
+      const { findDocuments } = await import('../../../src/db/mongo/helper');
+
+      const result = await findDocuments('testCollection');
+
+      expect(result).toEqual([]);
+    });
+  });
+
+  describe('findOneDocument', () => {
+    beforeEach(async () => {
+      mockGetDatabase.mockReturnValue({
+        connectionString: 'mongodb://localhost:27017/testdb',
+        options: {},
+      });
+    });
+
+    it('should find one document with default filter and options', async () => {
+      const mockDoc = { id: 1, name: 'test1' };
+      mockCollection.findOne.mockResolvedValue(mockDoc);
+
+      const { findOneDocument } = await import('../../../src/db/mongo/helper');
+
+      const result = await findOneDocument('testCollection');
+
+      expect(mockDb.collection).toHaveBeenCalledWith('testCollection');
+      expect(mockCollection.findOne).toHaveBeenCalledWith({}, {});
+      expect(result).toEqual(mockDoc);
+    });
+
+    it('should find one document with custom filter', async () => {
+      const mockDoc = { id: 1, name: 'test1' };
+      mockCollection.findOne.mockResolvedValue(mockDoc);
+
+      const { findOneDocument } = await import('../../../src/db/mongo/helper');
+
+      const filter = { id: 1 };
+      const result = await findOneDocument('testCollection', filter);
+
+      expect(mockCollection.findOne).toHaveBeenCalledWith(filter, {});
+      expect(result).toEqual(mockDoc);
+    });
+
+    it('should find one document with custom options', async () => {
+      const mockDoc = { id: 1, name: 'test1' };
+      mockCollection.findOne.mockResolvedValue(mockDoc);
+
+      const { findOneDocument } = await import('../../../src/db/mongo/helper');
+
+      const filter = { id: 1 };
+      const options = { projection: { _id: 0, name: 1 } };
+      const result = await findOneDocument('testCollection', filter, options);
+
+      expect(mockCollection.findOne).toHaveBeenCalledWith(filter, options);
+      expect(result).toEqual(mockDoc);
+    });
+
+    it('should return null when document not found', async () => {
+      mockCollection.findOne.mockResolvedValue(null);
+
+      const { findOneDocument } = await import('../../../src/db/mongo/helper');
+
+      const result = await findOneDocument('testCollection', { id: 999 });
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('getSessionStore', () => {
+    it('should create MongoDBStore with connection string and options', async () => {
+      const connectionString = 'mongodb://localhost:27017/testdb';
+      const options = { maxPoolSize: 10 };
+
+      mockGetDatabase.mockReturnValue({
+        connectionString,
+        options,
+      });
+
+      const { getSessionStore } = await import('../../../src/db/mongo/helper');
+
+      const result = getSessionStore();
+
+      expect(result).toBeDefined();
+      expect(mockMongoDBStore).toHaveBeenCalledWith({
+        mongoUrl: connectionString,
+        collectionName: 'user_session',
+        mongoOptions: options,
+      });
+    });
+  });
+});