public void CreatePatch() { var mapper = new ApiCommentsModelMapper(); var model = new ApiCommentsRequestModel(); model.SetProperties(DateTime.Parse("1/1/1987 12:00:00 AM"), 1, 1, "A", 1); JsonPatchDocument <ApiCommentsRequestModel> patch = mapper.CreatePatch(model); var response = new ApiCommentsRequestModel(); patch.ApplyTo(response); response.CreationDate.Should().Be(DateTime.Parse("1/1/1987 12:00:00 AM")); response.PostId.Should().Be(1); response.Score.Should().Be(1); response.Text.Should().Be("A"); response.UserId.Should().Be(1); }