add tests

Author: juli1

.github/workflows/build.yml

@@ -18,7 +18,10 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: 14
-
+      - name: Install packages
+        run: npm install
+      - name: Run tests
+        run: npm test
       - name: Build/release Electron app
         uses: samuelmeuli/action-electron-builder@v1
         with: