diff --git a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
index dfb9b16442045..88762ddbb60c4 100644
--- a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
@@ -114,7 +114,8 @@ public static function data_has_self_closing_flag() {
 			'Self-closing flag after attribute'          => array( '<div id=test />', true ),
 			'Slash inside unquoted attribute value'      => array( '<div id=test/>', false ),
 			'Slash only unquoted attribute value'        => array( '<div attr=/>', false ),
-			'Attribute "=" with value ""'                => array( '<div =/>', false ),
+			'Attribute "=" with value ""'                => array( '<div =/>', true ),
+			'Attribute "=" with value "/"'               => array( '<div ==/>', false ),
 			'Self-closing flag after quoted attribute'   => array( '<div id="test"/>', true ),
 			'Self-closing flag after boolean attribute'  => array( '<div enabled/>', true ),
 			'Ignored "/" and whitespace'                 => array( '<div / >', false ),