CakeResque::enqueue
While enqueuing jobs from TestController use CakeResque::enqueue('default', 'CakeResque.MailShell', //difference is here array('sendMail', 'test@gmail.com', 'Test Email', 'Hi this it test email.'));
While enqueuing jobs from TestController use CakeResque::enqueue('default', 'CakeResque.MailShell', //difference is here array('sendMail', 'test@gmail.com', 'Test Email', 'Hi this it test email.'));