ci: add unit testing check

.github/workflows/check.yaml

@@ -1,4 +1,5 @@
 name: Check
+
 on:
     push:
         branches:
@@ -10,6 +11,15 @@ defaults:
         working-directory: ./code
 
 jobs:
+    test:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-node@v4
+
+            - run: npm install
+            - run: npm test
+
     lint:
         runs-on: ubuntu-latest
         steps: