diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessor.php b/tests/phpunit/tests/html-api/wpHtmlProcessor.php
index 4b63a50f8e..6a666c19cf 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessor.php
@@ -11,7 +11,7 @@
  *
  * @coversDefaultClass WP_HTML_Processor
  */
-class Tests_HtmlApi_wpHtmlProcessor extends WP_UnitTestCase {
+class Tests_HtmlApi_WpHtmlProcessor extends WP_UnitTestCase {
 	/**
 	 * Ensure that the HTML Processor's public constructor function warns a developer to call
 	 * the static creator methods instead of directly instantiating a new class.
diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php b/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php
index dce973df6b..4bf46a173f 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessorBreadcrumbs.php
@@ -11,7 +11,7 @@
  *
  * @coversDefaultClass WP_HTML_Processor
  */
-class Tests_HtmlApi_wpHtmlProcessorBreadcrumbs extends WP_UnitTestCase {
+class Tests_HtmlApi_WpHtmlProcessorBreadcrumbs extends WP_UnitTestCase {
 	/**
 	 * @ticket 58517
 	 *
diff --git a/tests/phpunit/tests/html-api/wpHtmlSupportRequiredOpenElements.php b/tests/phpunit/tests/html-api/wpHtmlSupportRequiredOpenElements.php
index eb5e6d3cf4..53b7de494a 100644
--- a/tests/phpunit/tests/html-api/wpHtmlSupportRequiredOpenElements.php
+++ b/tests/phpunit/tests/html-api/wpHtmlSupportRequiredOpenElements.php
@@ -25,7 +25,7 @@
  *
  * @coversDefaultClass WP_HTML_Processor
  */
-class Tests_HtmlApi_wpHtmlSupportRequiredOpenElements extends WP_UnitTestCase {
+class Tests_HtmlApi_WpHtmlSupportRequiredOpenElements extends WP_UnitTestCase {
 	/**
 	 * Fails to assert if the HTML Processor handles the given tag.
 	 *
diff --git a/tests/phpunit/tests/html-api/wpHtmlTagProcessor-bookmark.php b/tests/phpunit/tests/html-api/wpHtmlTagProcessor-bookmark.php
index 1bbbe02021..90adfb20be 100644
--- a/tests/phpunit/tests/html-api/wpHtmlTagProcessor-bookmark.php
+++ b/tests/phpunit/tests/html-api/wpHtmlTagProcessor-bookmark.php
@@ -11,7 +11,7 @@
  *
  * @coversDefaultClass WP_HTML_Tag_Processor
  */
-class Tests_HtmlApi_wpHtmlTagProcessor_Bookmark extends WP_UnitTestCase {
+class Tests_HtmlApi_WpHtmlTagProcessor_Bookmark extends WP_UnitTestCase {
 
 	/**
 	 * @ticket 56299
diff --git a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
index 6cc59289cb..659ffb848e 100644
--- a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
@@ -11,7 +11,7 @@
  *
  * @coversDefaultClass WP_HTML_Tag_Processor
  */
-class Tests_HtmlApi_wpHtmlTagProcessor extends WP_UnitTestCase {
+class Tests_HtmlApi_WpHtmlTagProcessor extends WP_UnitTestCase {
 	const HTML_SIMPLE       = '<div id="first"><span id="second">Text</span></div>';
 	const HTML_WITH_CLASSES = '<div class="main with-border" id="first"><span class="not-main bold with-border" id="second">Text</span></div>';
 	const HTML_MALFORMED    = '<div><span class="d-md-none" Notifications</span><span class="d-none d-md-inline">Back to notifications</span></div>';