public void RemoveOfferTest()
{
OfferEditDataDto dto = new OfferEditDataDto()
{
Username = "******",
OfferId = 4
};
IHttpActionResult result = _controller.RemoveOfferAsync(dto);
Offer o = _context.Offers.FirstOrDefault(x => x.Id == dto.OfferId);
Assert.IsNull(o);
}