public function testEmailShouldNotBeSent()
{
//disable new book email (created eloquent event)
Book::flushEventListeners();
factory('App\\Model\\Book', 1)->create(['user_id' => factory(App\Model\User::class)->create()->id, 'taken_at' => new DateTime()]);
$mock = $this->getMockBuilder('\\Illuminate\\Mail\\Mailer')->disableOriginalConstructor()->getMock();
$mock->expects($this->never())->method('raw');
$command = new ReturnBookRemind($mock);
$command->handle();
}