Migrate tests/unit folder to WordPress Coding Standard

[MAILPOET-6240]

packages/php/email-editor/tests/unit/_bootstrap.php

@@ -1,16 +1,41 @@
-<?php declare(strict_types = 1);
+<?php
+/**
+ * This file is part of the MailPoet plugin.
+ *
+ * @package MailPoet\EmailEditor
+ */
+
+declare(strict_types = 1);
 
 $console = new \Codeception\Lib\Console\Output( array() );
 
 if ( ! function_exists( 'esc_attr' ) ) {
+	/**
+	 * Mock esc_attr function.
+	 *
+	 * @param string $attr Attribute to escape.
+	 */
 	function esc_attr( $attr ) {
 		return $attr;
 	}
 }
 
+/**
+ * Base class for unit tests.
+ */
 abstract class MailPoetUnitTest extends \Codeception\TestCase\Test {
-	protected $runTestInSeparateProcess = false;
-	protected $preserveGlobalState      = false;
+	/**
+	 * Disable running tests in separate processes.
+	 *
+	 * @var bool
+	 */
+	protected $runTestInSeparateProcess = false; // phpcs:ignore WordPress.NamingConventions.ValidVariableName.PropertyNotSnakeCase
+	/**
+	 * Disable preserving global state.
+	 *
+	 * @var bool
+	 */
+	protected $preserveGlobalState = false; // phpcs:ignore WordPress.NamingConventions.ValidVariableName.PropertyNotSnakeCase
 }
 
 require '_stubs.php';