public async Task Given_A_Request_To_Update_An_Individual_Property_When_THePropertyDoesNotExist_Then_ReturnNotFound()
{
//Arrange
string propertyReference = "P009";
mediatorMock.Setup(x => x.Send(It.IsAny <Update.Command>(), default(CancellationToken))).Returns(Task.FromResult <Update.Result>(null));
//Act
var sut = new PropertyController(mediatorMock.Object);
var actionResult = await sut.PartialPropertyUpdate(propertyReference, new JsonPatchDocument <PropertyPatchModel>()) as NotFoundResult;
//Assert
Assert.NotNull(actionResult);
Assert.Equal(actionResult.StatusCode, (Int32)System.Net.HttpStatusCode.NotFound);
}