Unit Tests added in [31970] need to be restricted to run in Multisite only.

See #17904, #26784.



git-svn-id: https://develop.svn.wordpress.org/trunk@31978 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/multisite/wpmuValidateUserSignup.php

@@ -1,5 +1,7 @@
 <?php
 
+if ( is_multisite() ) :
+
 /**
  * @group multisite
  */
@@ -120,3 +122,5 @@ class Tests_Multisite_WpmuValidateUserSignup extends WP_UnitTestCase {
 	}
 
 }
+
+endif;