test: migrate to Yoast WP test utils and work around incompatibilities

.github/workflows/test.yml

@@ -13,9 +13,9 @@ jobs:
           - php: '8.1'
             wordpress: '6.1'
           - php: '8.0'
+            wordpress: '6.0'
+          - php: '7.4'
             wordpress: '5.9'
-          - php: '7.2'
-            wordpress: '5.0'
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -25,7 +25,7 @@ jobs:
           php-version: ${{ matrix.php }}
           tools: composer
       - name: Setup DB
-        run: sudo /etc/init.d/mysql start
+        run: sudo sudo systemctl start mysql.service
       - name: Setup WP
         run: bash bin/install-wp-tests.sh wordpress root root localhost "${{ matrix.wordpress }}"
       - name: Install

composer.json

@@ -24,11 +24,10 @@
     "dealerdirect/phpcodesniffer-composer-installer": "^v1.0",
     "matthiasmullie/minify": "^1.3",
     "phpcompatibility/phpcompatibility-wp": "^2.1",
-    "phpunit/phpunit": "^8|^9",
     "slowprog/composer-copy-file": "~0.3",
     "squizlabs/php_codesniffer": "^3.9",
     "wp-coding-standards/wpcs": "^3.0",
-    "yoast/phpunit-polyfills": "^2.0"
+    "yoast/wp-test-utils": "^1.2"
   },
   "scripts": {
     "post-install-cmd": [

tests/bootstrap.php

@@ -5,34 +5,25 @@
  * @package SCLiveticker
  */
 
-$_tests_dir = getenv( 'WP_TESTS_DIR' );
+use Yoast\WPTestUtils\WPIntegration;
 
-if ( ! $_tests_dir ) {
-	$_tests_dir = rtrim( sys_get_temp_dir(), '/\\' ) . '/wordpress-tests-lib';
-}
+require_once dirname( __DIR__ ) . '/vendor/yoast/wp-test-utils/src/WPIntegration/bootstrap-functions.php';
 
-// Forward custom PHPUnit Polyfills configuration to PHPUnit bootstrap file.
-$_phpunit_polyfills_path = getenv( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH' );
-if ( false !== $_phpunit_polyfills_path ) {
-	define( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH', $_phpunit_polyfills_path );
-}
+$_tests_dir = WPIntegration\get_path_to_wp_test_dir();
 
-if ( ! file_exists( "{$_tests_dir}/includes/functions.php" ) ) {
-	echo "Could not find {$_tests_dir}/includes/functions.php, have you run bin/install-wp-tests.sh ?" . PHP_EOL; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
-	exit( 1 );
-}
+// Get access to tests_add_filter() function.
+require_once $_tests_dir . 'includes/functions.php';
 
-// Give access to tests_add_filter() function.
-require_once "{$_tests_dir}/includes/functions.php";
+// Add plugin to active mu-plugins to make sure it gets loaded.
+tests_add_filter(
+	'muplugins_loaded',
+	function() {
+		require dirname( __DIR__ ) . '/stklcode-liveticker.php';
+	}
+);
 
-/**
- * Manually load the plugin being tested.
+/*
+ * Bootstrap WordPress. This will also load the Composer autoload file, the PHPUnit Polyfills
+ * and the custom autoloader for the TestCase and the mock object classes.
  */
-function _manually_load_plugin(): void {
-	require dirname( dirname( __FILE__ ) ) . '/stklcode-liveticker.php';
-}
-
-tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
-
-// Start up the WP testing environment.
-require "{$_tests_dir}/includes/bootstrap.php";
+WPIntegration\bootstrap_it();

tests/test-api.php

@@ -13,12 +13,12 @@ use DateInterval;
 use DateTime;
 use WP_REST_Request;
 use WP_REST_Server;
-use WP_UnitTestCase;
+use Yoast\WPTestUtils\WPIntegration\TestCase;
 
 /**
  * Class Test_API.
  */
-class Test_API extends WP_UnitTestCase {
+class Test_API extends TestCase {
 	/**
 	 * Initialize WP REST API for tests.
 	 *