diff --git a/core/modules/page_cache/src/Tests/PageCacheTest.php b/core/modules/page_cache/src/Tests/PageCacheTest.php
index 1ec9282eb58cf968fb4349fb4210429d63e683b8..2ca10e3e50d88b6ee1b6217f4c90f9c1fe712e55 100644
--- a/core/modules/page_cache/src/Tests/PageCacheTest.php
+++ b/core/modules/page_cache/src/Tests/PageCacheTest.php
@@ -382,7 +382,7 @@ function testPageCacheAnonymous403404() {
       $this->assertTrue(
         $difference > $cache_ttl_4xx - 5 &&
         $difference < $cache_ttl_4xx + 5,
-        'The cache entry expiry time uses the cache_ttl_4xx setting.'
+        "The cache entry expiry time uses the cache_ttl_4xx setting. Expire: {$cache_item->expire} Created: {$cache_item->created}"
       );
     }