Fixed unreasonable failing test for RUCSS

tests/Integration/inc/Engine/Common/JobManager/Cron/Subscriber/checkJobStatus.php

@@ -14,18 +14,29 @@ class Test_CheckJobStatus extends FilesystemTestCase {
 
 	protected $config;
 
+	public static function set_up_before_class() {
+		parent::set_up_before_class();
+
+		// Install in set_up_before_class because of exists() requiring not temporary table.
+		self::installUsedCssTable();
+	}
+
+	public static function tear_down_after_class() {
+		self::uninstallUsedCssTable();
+
+		parent::tear_down_after_class();
+	}
+
 	public function set_up() {
 		parent::set_up();
 
-		self::installUsedCssTable();
 		self::installPreloadCacheTable();
 
 		add_filter( 'pre_http_request', [ $this, 'mock_http' ], 10, 3 );
 		add_filter( 'rocket_rucss_hash', [ $this, 'rucss_hash' ] );
 	}
 
 	public function tear_down() {
-		self::uninstallUsedCssTable();
 		self::uninstallPreloadCacheTable();
 
 		remove_filter( 'rocket_rucss_hash', [ $this, 'rucss_hash' ] );