public function testDeleteCoupon()
{
$pk = '5599f782e3f434f616787edc';
$coupon = new Coupon();
$coupon->setId(new \MongoId($pk));
$this->repository->expects($this->once())->method('findByPk')->with($pk)->willReturn($coupon);
$this->repository->expects($this->once())->method('delete')->with($pk);
$this->sut->deleteCoupon($pk);
}
