public async Task Post() { var response = await _client.PostAsync("/sample/Products(1L)/Categories/$ref", Helpers.JSON(new Dictionary <string, object> { ["@odata.id"] = "http://localhost/sample/Categories(2)" })); Assert.Equal(HttpStatusCode.OK, response.StatusCode); response = await _client.GetAsync("/sample/Products(1L)/Categories(2)"); Assert.Equal(HttpStatusCode.OK, response.StatusCode); }