workflows: Add mongodb server to jest workflow for database tests.

.github/workflows/jest.yml

@@ -22,6 +22,10 @@ jobs:
       with:
         node-version: '20'
 
+    - name: Use MongoDB in Github Actions
+      uses: supercharge/[email protected]
+
+
     - name: Install backend dependencies
       working-directory: ./backend
       run: npm install

backend/tests/database.test.ts

@@ -0,0 +1,20 @@
+import mongoose from 'mongoose';
+
+describe('DB connection test', () => {
+    beforeAll(async () => {
+        await mongoose
+            .connect('mongodb://localhost:27017/users')
+            .then(() => console.log('DB connected'));
+    }, 30000);
+    it('should insert a user into collection', async () => {
+        const users = mongoose.connection.collection('users');
+        const mockUser = { name: 'user1234', password: 'pass1' };
+        await users.insertOne(mockUser);
+
+        const insertedUser = await users.findOne({ name: 'user1234' });
+        expect(insertedUser).toEqual(mockUser);
+    });
+    afterAll(async () => {
+        await mongoose.connection.close();
+    });
+});