diff --git a/core/modules/node/src/Tests/PagePreviewTest.php b/core/modules/node/src/Tests/PagePreviewTest.php
index 37b00d3..d47f5fc 100644
--- a/core/modules/node/src/Tests/PagePreviewTest.php
+++ b/core/modules/node/src/Tests/PagePreviewTest.php
@@ -184,6 +184,10 @@ public function testPagePreview() {
     $this->assertText($edit[$term_key], 'Term displayed.');
     $this->assertLink(t('Back to content editing'));
 
+    // Check that we see the class of the node type on the body element
+    $body_class_element = $this->xpath("//body[contains(@class, 'page-node-type-page')]");
+    $this->assertTrue(!empty($body_class_element), 'Node type body class found.');
+
     // Get the UUID.
     $url = parse_url($this->getUrl());
     $paths = explode('/', $url['path']);