add test ci workflow

Author: kateinoigakukun

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+          
+      - run: npm install
+      - run: npm test
+