public void Search_Flight_InvalidObjectPassed_ReturnsBadRequest()
{
SearchInputDto searchInput = new SearchInputDto()
{
DepatureDateTime = Convert.ToDateTime(""),
FromDestination = "Johannesburg",
ToDestination = "Durban",
NoOfPassenger = 50
};
_controller.ModelState.AddModelError("DepatureDateTime", "Required");
var badResponse = _controller.GetAvailableflight(searchInput);
Assert.IsType <BadRequestObjectResult>(badResponse);
}