add phpunit test

.forgejo/workflows/phpunit.yml

@@ -0,0 +1,42 @@
+name: Unit Testing
+on:
+  push:
+  pull_request:
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+    services:
+      mysql:
+        image: mariadb
+        env:
+          MYSQL_ROOT_PASSWORD: root
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=10s --health-retries=10
+      strategy:
+        matrix:
+          php-versions: ['8.1', '8.2', '8.3']
+          include:
+            - wp-version: latest
+    steps:
+      - name: Checkout
+        uses: https://code.forgejo.org/actions/checkout@v4
+
+      # - name: Setup PHP
+      #   uses: shivammathur/setup-php@v2
+      #   with:
+      #     php-version: ${{ matrix.php-versions }}
+      #     coverage: none
+      #     tools: composer, phpunit-polyfills
+      #     extensions: mysql
+
+      # - name: Install Composer dependencies for PHP
+      #   uses: "ramsey/composer-install@v1"
+
+      # - name: Setup Test Environment
+      #   run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 ${{ matrix.wp-version }}
+
+      # - name: Unit Testing
+      #   run: ./vendor/bin/phpunit
+      #   env:
+      #     PHP_VERSION: ${{ matrix.php-versions }}