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 +1,13 @@
+import mongoose from 'mongoose';
+
+describe('DB connection test', () => {
+    beforeAll(async () => {
+        await mongoose
+            .connect('mongodb://localhost:27017/testdb')
+            .then(() => console.log('DB connected'));
+    });
+
+    afterAll(async () => {
+        await mongoose.connection.close();
+    });
+});