Mark skipped until #12085 is merged

See https://github.com/owncloud/core/pull/12175#issuecomment-63054620

tests/settings/controller/mailsettingscontrollertest.php

@@ -147,6 +147,12 @@ class MailSettingscontrollerTest extends \PHPUnit_Framework_TestCase {
 	}
 
 	public function testSendTestMail() {
+		/**
+		 * FIXME: Disabled due to missing DI on mail class. 
+		 * TODO: Re-enable when https://github.com/owncloud/core/pull/12085 is merged.
+		 */
+		$this->markSkipped();
+		
 		$user = $this->getMockBuilder('\OC\User\User')
 			->disableOriginalConstructor()
 			->getMock();