fix: defer MongoDB connection until runtime

proto/src/lib/mongodb.test.ts

@@ -32,6 +32,7 @@ const originalEnv = process.env
 
 describe('MongoDB Connection (Unit Tests)', () => {
   beforeEach(() => {
+    jest.resetModules()
     process.env = {
       ...originalEnv,
       MONGODB_URI: 'mongodb://localhost:27017/test',
@@ -58,9 +59,8 @@ describe('MongoDB Connection (Unit Tests)', () => {
       // Clear module cache to force re-import
       jest.resetModules()
       
-      expect(() => {
-        require('./mongodb')
-      }).toThrow('Please add MONGODB_URI to your environment variables')
+      const { getClientPromise } = require('./mongodb')
+      expect(() => getClientPromise()).toThrow('Please add MONGODB_URI to your environment variables')
       
       // Restore environment
       process.env.MONGODB_URI = originalMongodbUri
@@ -70,9 +70,9 @@ describe('MongoDB Connection (Unit Tests)', () => {
   describe('Database connection', () => {
     it('should create MongoClient with correct URI and options', async () => {
       // Import after setting up the mock
-      const { clientPromise } = await import('./mongodb')
+      const { getClientPromise } = await import('./mongodb')
 
-      await clientPromise
+      await getClientPromise()
 
       expect(MockedMongoClient).toHaveBeenCalledWith(
         process.env.MONGODB_URI,
@@ -131,13 +131,13 @@ describe('MongoDB Connection (Unit Tests)', () => {
 
   describe('Connection reuse and caching', () => {
     it('should reuse the same MongoClient instance for multiple calls', async () => {
-      const { clientPromise } = await import('./mongodb')
+      const { getClientPromise } = await import('./mongodb')
 
-      const client1 = await clientPromise
-      const client2 = await clientPromise
+      const client1 = await getClientPromise()
+      const client2 = await getClientPromise()
 
       // Should be the same client instance
       expect(client1).toBe(client2)
     })
   })
-})
+})