diff --git a/core/modules/system/src/Tests/Theme/TableTest.php b/core/modules/system/src/Tests/Theme/TableTest.php
index 9117de9..6d54d03 100644
--- a/core/modules/system/src/Tests/Theme/TableTest.php
+++ b/core/modules/system/src/Tests/Theme/TableTest.php
@@ -305,7 +305,7 @@ public function testThemeTableRowRenderArray() {
     );
     $this->render($table);
     $this->removeWhiteSpace();
-    $this->assertRaw('<tbody><tr><td>1-one</td><td>1-two</td><td>1-three</td></tr>', 'Table row 1 found.');
-    $this->assertRaw('<tr><td>2-one</td><td>2-two</td><td><b>2-three</b></td></tr></tbody>', 'Table row 2 found.');
+    $this->assertRaw('<tbody><tr><td data-th="one">1-one</td><td data-th="two">1-two</td><td data-th="three">1-three</td></tr>', 'Table row 1 found.');
+    $this->assertRaw('<tr><td data-th="one">2-one</td><td data-th="two">2-two</td><td data-th="three"><b>2-three</b></td></tr></tbody>', 'Table row 2 found.');
   }
 }