Move polyfills to extra and load as mu-plugin

Author: schlessera

features/bootstrap/FeatureContext.php

@@ -782,9 +782,12 @@ public function download_wp( $subdir = '' ) {
 
 		self::copy_dir( self::$cache_dir, $dest_dir );
 
-		// disable emailing
+		// Disable emailing.
 		mkdir( $dest_dir . '/wp-content/mu-plugins' );
 		copy( __DIR__ . '/../extra/no-mail.php', $dest_dir . '/wp-content/mu-plugins/no-mail.php' );
+
+		// Add polyfills.
+		copy( __DIR__ . '/../extra/polyfills.php', $dest_dir . '/wp-content/mu-plugins/polyfills.php' );
 	}
 
 	public function create_config( $subdir = '', $extra_php = false ) {

features/bootstrap/polyfills.php features/extra/polyfills.phpfeatures/bootstrap/polyfills.php renamed to features/extra/polyfills.php

@@ -1,6 +1,9 @@
 <?php
 /**
  * Polyfills used by Behat to support multiple versions of WP.
+ *
+ * This file will get installed as a must-use plugin in WP installs that are run
+ * by the functional tests.
  */
 
 /*

phpcs.xml.dist

@@ -76,6 +76,6 @@
 	<!-- This is a procedural stand-alone file that is adding polyfills when
 		 applicable only. -->
 	<rule ref="WordPress.NamingConventions.PrefixAllGlobals">
-		<exclude-pattern>*/features/bootstrap/polyfills\.php$</exclude-pattern>
+		<exclude-pattern>*/extra/polyfills\.php$</exclude-pattern>
 	</rule>
 </ruleset>