Set testNow() on MutableDate too.

tests/bootstrap.php

@@ -12,6 +12,10 @@
  */
 
 use Cake\Cache\Cache;
+use Cake\Chronos\Chronos;
+use Cake\Chronos\Date;
+use Cake\Chronos\MutableDate;
+use Cake\Chronos\MutableDateTime;
 use Cake\Core\Configure;
 use Cake\Datasource\ConnectionManager;
 use Cake\I18n\I18n;
@@ -118,8 +122,9 @@ Log::config([
     ]
 ]);
 
-Cake\Chronos\Chronos::setTestNow(Cake\Chronos\Chronos::now());
-Cake\Chronos\MutableDateTime::setTestNow(Cake\Chronos\MutableDateTime::now());
-Cake\Chronos\Date::setTestNow(Cake\Chronos\Date::now());
+Chronos::setTestNow(Chronos::now());
+MutableDateTime::setTestNow(MutableDateTime::now());
+Date::setTestNow(Date::now());
+MutableDate::setTestNow(MutableDate::now());
 
 ini_set('intl.default_locale', 'en_US');