public void ResignOfferTest()
{
ReserveOfferDto dto = new ReserveOfferDto()
{
Username = "******",
OfferId = 3
};
IHttpActionResult result = _controller.ResignOffer(dto);
var contentResult = result as OkNegotiatedContentResult <bool>;
Offer o = _context.Offers.FirstOrDefault(x => x.Id == dto.OfferId);
Assert.IsNotNull(o);
Assert.AreEqual(o.IsBooked, false);
Assert.IsNull(o.Customer);
}