✅(y-provider) add tests for y-provider server

We add jest tests for the y-provider server.
The CI will be able to run the tests.

.github/workflows/impress-frontend.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - name: Restore the frontend cache
         uses: actions/cache@v4
@@ -46,6 +46,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20.x"
+
       - name: Restore the frontend cache
         uses: actions/cache@v4
         id: front-node_modules
@@ -54,7 +59,7 @@ jobs:
           key: front-node_modules-${{ hashFiles('src/frontend/**/yarn.lock') }}
 
       - name: Test App
-        run: cd src/frontend/ && yarn app:test
+        run: cd src/frontend/ && yarn test
 
   lint-front:
     runs-on: ubuntu-latest