Add test for </br> and next_tag()

Author: sirreal

tests/phpunit/tests/html-api/wpHtmlTagProcessor.php

@@ -381,6 +381,16 @@ public function test_get_attribute_names_with_prefix_returns_attribute_added_by_
 		);
 	}
 
+	/**
+	 * @ticket 63891
+	 *
+	 * @covers WP_HTML_Tag_Processor::next_tag
+	 */
+	public function test_next_attributes_stops_on_br_close() {
+		$processor = new WP_HTML_Tag_Processor( '</br>' );
+		$this->assertTrue( $processor->next_tag() );
+	}
+
 	/**
 	 * @ticket 63891
 	 *