Issue #2847268 by tacituseu, alexpott, dawehner: Random fail in...

Issue #2847268 by tacituseu, alexpott, dawehner: Random fail in Drupal\page_cache\Tests\PageCacheTest:: testPageCacheAnonymous403404()

core/modules/page_cache/src/Tests/PageCacheTest.php

@@ -378,10 +378,10 @@ function testPageCacheAnonymous403404() {
       // Given that a second might have passed we cannot be sure that
       // $difference will exactly equal the default cache_ttl_4xx setting.
       // Account for any timing difference or rounding errors by ensuring the
-      // value is within 5 seconds.
+      // value is within 10 seconds.
       $this->assertTrue(
-        $difference > $cache_ttl_4xx - 5 &&
-        $difference < $cache_ttl_4xx + 5,
+        $difference > $cache_ttl_4xx - 10 &&
+        $difference < $cache_ttl_4xx + 10,
         "The cache entry expiry time uses the cache_ttl_4xx setting. Expire: {$cache_item->expire} Created: {$cache_item->created}"
       );
     }