diff --git a/packages/php/email-editor/tests/_support/IntegrationTester.php b/packages/php/email-editor/tests/_support/IntegrationTester.php
index ff227d2aaa..fc2fb0454d 100644
--- a/packages/php/email-editor/tests/_support/IntegrationTester.php
+++ b/packages/php/email-editor/tests/_support/IntegrationTester.php
@@ -1,5 +1,11 @@
-<?php declare(strict_types=1);
+<?php
+/**
+ * This file is part of the MailPoet plugin tests.
+ *
+ * @package MailPoet\EmailEditor
+ */
 
+declare(strict_types=1);
 
 /**
  * Inherited Methods
@@ -21,18 +27,40 @@ class IntegrationTester extends \Codeception\Actor {
 
 	use _generated\IntegrationTesterActions;
 
-	private $wpTermIds = array();
+	/**
+	 * WP term ids.
+	 *
+	 * @var array
+	 */
+	private $wp_term_ids = array();
 
-	private $createdCommentIds = array();
+	/**
+	 * List of created comment ids.
+	 *
+	 * @var array
+	 */
+	private $created_comment_ids = array();
 
+	/**
+	 * List of created posts.
+	 *
+	 * @var array
+	 */
 	private $posts = array();
 
-	public function createPost( array $params ): \WP_Post {
-		$postId = wp_insert_post( $params );
-		if ( $postId instanceof WP_Error ) {
+	/**
+	 * Method for creating a post.
+	 *
+	 * @param array $params - Post parameters.
+	 * @return \WP_Post
+	 * @throws \Exception - If the post creation fails.
+	 */
+	public function create_post( array $params ): \WP_Post {
+		$post_id = wp_insert_post( $params );
+		if ( $post_id instanceof WP_Error ) {
 			throw new \Exception( 'Failed to create post' );
 		}
-		$post = get_post( $postId );
+		$post = get_post( $post_id );
 		if ( ! $post instanceof WP_Post ) {
 			throw new \Exception( 'Failed to fetch the post' );
 		}
@@ -40,11 +68,17 @@ class IntegrationTester extends \Codeception\Actor {
 		return $post;
 	}
 
-	public function cleanup() {
-		$this->deletePosts();
+	/**
+	 * Method for cleaning up after the test.
+	 */
+	public function cleanup(): void {
+		$this->delete_posts();
 	}
 
-	private function deletePosts() {
+	/**
+	 * Delete created posts.
+	 */
+	private function delete_posts(): void {
 		foreach ( $this->posts as $post ) {
 			wp_delete_post( $post->ID, true );
 		}
diff --git a/packages/php/email-editor/tests/_support/UnitTester.php b/packages/php/email-editor/tests/_support/UnitTester.php
index 614e628811..67a83112a4 100644
--- a/packages/php/email-editor/tests/_support/UnitTester.php
+++ b/packages/php/email-editor/tests/_support/UnitTester.php
@@ -1,4 +1,9 @@
 <?php
+/**
+ * This file is part of the MailPoet plugin.
+ *
+ * @package MailPoet\EmailEditor
+ */
 
 use _generated\UnitTesterActions;
 
diff --git a/packages/php/email-editor/tests/integration/Engine/Renderer/ContentRenderer/Content_Renderer_Test.php b/packages/php/email-editor/tests/integration/Engine/Renderer/ContentRenderer/Content_Renderer_Test.php
index bb1d58f4f1..ce5691079e 100644
--- a/packages/php/email-editor/tests/integration/Engine/Renderer/ContentRenderer/Content_Renderer_Test.php
+++ b/packages/php/email-editor/tests/integration/Engine/Renderer/ContentRenderer/Content_Renderer_Test.php
@@ -17,7 +17,7 @@ class Content_Renderer_Test extends \MailPoetTest {
 		$this->diContainer->get( Email_Editor::class )->initialize();
 		$this->diContainer->get( BlockTypesController::class )->initialize();
 		$this->renderer  = $this->diContainer->get( Content_Renderer::class );
-		$this->emailPost = $this->tester->createPost(
+		$this->emailPost = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:paragraph --><p>Hello!</p><!-- /wp:paragraph -->',
 			)
diff --git a/packages/php/email-editor/tests/integration/Engine/Renderer/Renderer_Test.php b/packages/php/email-editor/tests/integration/Engine/Renderer/Renderer_Test.php
index 196b6d532c..932a7a0feb 100644
--- a/packages/php/email-editor/tests/integration/Engine/Renderer/Renderer_Test.php
+++ b/packages/php/email-editor/tests/integration/Engine/Renderer/Renderer_Test.php
@@ -51,7 +51,7 @@ class Renderer_Test extends \MailPoetTest {
 				'themeController'    => $themeControllerMock,
 			)
 		);
-		$this->emailPost = $this->tester->createPost(
+		$this->emailPost = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:paragraph --><p>Hello!</p><!-- /wp:paragraph -->',
 			)
diff --git a/packages/php/email-editor/tests/integration/Integrations/Core/Renderer/Renderer_Test.php b/packages/php/email-editor/tests/integration/Integrations/Core/Renderer/Renderer_Test.php
index 6329376434..51b4218db6 100644
--- a/packages/php/email-editor/tests/integration/Integrations/Core/Renderer/Renderer_Test.php
+++ b/packages/php/email-editor/tests/integration/Integrations/Core/Renderer/Renderer_Test.php
@@ -18,7 +18,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesButtonDefaultStyles() {
-		$emailPost  = $this->tester->createPost(
+		$emailPost  = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:button --><div class="wp-block-button"><a class="wp-block-button__link has-background wp-element-button">Button</a></div><!-- /wp:button -->',
 			)
@@ -34,7 +34,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testButtonDefaultStylesDontOverwriteUserSetStyles() {
-		$emailPost  = $this->tester->createPost(
+		$emailPost  = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:button {"backgroundColor":"white","textColor":"vivid-cyan-blue"} --><div class="wp-block-button"><a class="wp-block-button__link has-background wp-element-button">Button</a></div><!-- /wp:button -->',
 			)
@@ -46,7 +46,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesHeadingFontSize() {
-		$emailPost   = $this->tester->createPost(
+		$emailPost   = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:heading {"level":1,"style":{"typography":{"fontSize":"large"}}} --><h1 class="wp-block-heading">Hello</h1><!-- /wp:heading -->',
 			)
@@ -57,7 +57,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesHeadingColors() {
-		$emailPost           = $this->tester->createPost(
+		$emailPost           = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:heading {"level":1, "backgroundColor":"black", "textColor":"luminous-vivid-orange"} --><h1 class="wp-block-heading has-luminous-vivid-orange-color has-black-background-color">Hello</h1><!-- /wp:heading -->',
 			)
@@ -69,7 +69,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesParagraphColors() {
-		$emailPost             = $this->tester->createPost(
+		$emailPost             = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:paragraph {style":{"color":{"background":"black", "text":"luminous-vivid-orange"}}} --><p class="has-luminous-vivid-orange-color has-black-background-color">Hello</p><!-- /wp:paragraph -->',
 			)
@@ -81,7 +81,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesListColors() {
-		$emailPost = $this->tester->createPost(
+		$emailPost = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:list {"backgroundColor":"black","textColor":"luminous-vivid-orange","style":{"elements":{"link":{"color":{"text":"var:preset|color|vivid-red"}}}}} -->
         <ul class="has-black-background-color has-luminous-vivid-orange-color has-text-color has-background has-link-color"><!-- wp:list-item -->
@@ -101,7 +101,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesColumnsColors() {
-		$emailPost = $this->tester->createPost(
+		$emailPost = $this->tester->create_post(
 			array(
 				'post_content' => '<!-- wp:columns {"backgroundColor":"vivid-green-cyan", "textColor":"black"} -->
         <div class="wp-block-columns has-black-background-color has-luminous-vivid-orange-color"><!-- wp:column --><!-- /wp:column --></div>
@@ -115,7 +115,7 @@ class Renderer_Test extends \MailPoetTest {
 	}
 
 	public function testItInlinesColumnColors() {
-		$emailPost = $this->tester->createPost(
+		$emailPost = $this->tester->create_post(
 			array(
 				'post_content' => '
       <!-- wp:column {"verticalAlignment":"stretch","backgroundColor":"black","textColor":"luminous-vivid-orange"} -->