Add unit tests to CI

Author: simonrw

.github/workflows/test.yml

@@ -140,3 +140,25 @@ jobs:
       - name: Verify successful deployment
         run: |
           [ $(aws cloudformation describe-stacks --stack-name $STACK_NAME --endpoint-url http://localhost:4566 | jq '[ .Stacks[] | select(.StackStatus == "CREATE_COMPLETE") ] | length') -eq 1 ] || exit 1
+
+  unit-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          path: repo
+
+      - name: Use Node.js ${{ inputs.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ inputs.node-version }}
+
+      - name: Install project
+        run: |
+          npm ci
+
+      - name: Run tests
+        run: |
+          npm run test
+
+