Improve code quality and write tests

.github/workflows/workflow.yml

@@ -21,6 +21,11 @@ jobs:
     - name: Installing NPM
       run: npm install  
 
+    - name: Run tests and send coverage
+      run: |
+        npm test
+        curl -s https://codecov.io/bash | bash -s -- -t ${{secrets.CODECOV_TOKEN}} -f coverage/clover.xml -n github-actions-codecov
+
     - name: Installing PHP with extensions and custom config
       run: node lib/install.js
       env: