only in patch2:
unchanged:
--- a/core/modules/system/src/Tests/System/ThemeTest.php
+++ b/core/modules/system/src/Tests/System/ThemeTest.php
@@ -359,7 +359,8 @@ function testInstallAndSetAsDefault() {
     $version = $themes['bartik']->info['version'];
 
     // Confirm Bartik is indicated as the default theme.
-    $this->assertTextPattern('/Bartik ' . preg_quote($version) . '\s{2,}\(default theme\)/');
+    $this->assertTextPattern('/Bartik\s{2,}\(default theme\)/');
+    $this->assertTextPattern('/Version: ' . preg_quote($version) . '/');
   }
 
 }