Issue #2924753 by vaplas, alexpott, borisson_, xjm: Random fail in ExposedFormUITest

core/modules/views_ui/tests/src/Functional/UITestBase.php

@@ -76,8 +76,8 @@ protected function drupalGet($path, array $options = [], array $headers = []) {
     $url = $this->buildUrl($path, $options);
 
     // Ensure that each nojs page is accessible via ajax as well.
-    if (strpos($url, 'nojs') !== FALSE) {
-      $url = str_replace('nojs', 'ajax', $url);
+    if (strpos($url, '/nojs/') !== FALSE) {
+      $url = preg_replace('|/nojs/|', '/ajax/', $url, 1);
       $result = $this->drupalGet($url, $options);
       $this->assertSession()->statusCodeEquals(200);
       $this->assertEquals('application/json', $this->getSession()->getResponseHeader('Content-Type'));