Do we need to check saved data?

[ildar-shaymukhametov]

var addResponse = await client.PostAsJsonAsync("todo", new { 
            title = "New Todo",
            description = "Description of the todo"
        });

Assert.Equal(System.Net.HttpStatusCode.OK, addResponse.StatusCode);

Here you do not test if saved item actually has title "New Todo" in db (what it if it was not assigned at all?)
My question is why?

[ITHedgeHog]

This is from Martin's NDC Conference Talk Building Operable Software with TDD (but not the way you think). He explains this in the video why it doesn't test that- you want about 19 minutes in for your specific question.

But I really suggest you watch the whole talk https://www.youtube.com/watch?v=prLRI3VEVq4 it explains several important things @ildar-shaymukhametov