diff --git a/core/modules/system/src/Tests/Pager/PagerTest.php b/core/modules/system/src/Tests/Pager/PagerTest.php
index 71413f2..0a49a58 100644
--- a/core/modules/system/src/Tests/Pager/PagerTest.php
+++ b/core/modules/system/src/Tests/Pager/PagerTest.php
@@ -120,6 +120,13 @@ public function testMultiplePagers() {
         'expected_page' => [0 => '3', 1 => '4', 4 => '5'],
         'expected_query' => '?page=2,3,,,4',
       ],
+      // If negative values are passed as page numbers, the first page is
+      // returned.
+      [
+        'input_query' => '?page=-2,-6,,,5',
+        'expected_page' => [0 => '1', 1 => '1', 4 => '6'],
+        'expected_query' => '?page=0,0,,,5',
+      ],
       // If floats are passed as page numbers, only the integer part is
       // returned.
       [