fix test workflow

Author: jakubmikita

.github/workflows/test.yml

@@ -16,13 +16,28 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
+        php: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4']
+    services:
+      mysql:
+        image: mysql:5.7
+        env:
+          MYSQL_ROOT_PASSWORD: root
+          MYSQL_DATABASE: wordpress_test
+        ports:
+          - 3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
     steps:
     - name: Checkout
       uses: actions/checkout@v2
     - name: Install dependencies
       run: composer install --no-progress
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v1
+      with:
+        php-version: ${{ matrix.php }}
+        extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, mysql, mysqli, pdo_mysql, bcmath, soap, intl, gd, exif, iconv, imagick
+        coverage: none
     - name: PHPUnit
       run: |
-        composer setup-local-tests
-        composer phpunit
+        bin/install-wp-tests.sh wordpress_test root root 127.0.0.1:${{ job.services.mysql.ports['3306'] }} latest true
+        vendor/bin/phpunit