Assert when property has NullValueHandling.Ignore

Question

On my endpoint's response I need to omit a property if its value is null , so I have tagged the prop with the [JsonProperty(NullValueHandling = NullValueHandling.Ignore)] tag.

So, with the tag on the property, this property is not going to be part of the response payload and that's what I want to check/assert on my unit tests, that the property does not appear on my JSON response.

I'm using FluentAssertions as assertion framework and AutoFixture as mock generator.

Answer 1

I serialized the response of the endpoint, parsed it to a JObject and then validated if the token exists inside that json, something like this:

//Act
var result = await controller.Get(entity.Id);
var objectResult = result as OkObjectResult;
    
string serializeResponse = JsonConvert.SerializeObject(objectResult.Value,Formatting.Indented);                                                           
                
JObject responseJOject = JObject.Parse(serializeResponse);
                
//Assert: this is how I checked if the tokens were or not on the json
using (new AssertionScope())
{
  responseJOject.ContainsKey("myToken1").Should().BeFalse();
  responseJOject.ContainsKey("myToken2").Should().BeFalse();
}

This was based on @dennis-doomen response, I took his advice, but in the opposite way, because all I wanted is to validate if the property was or not inside the response payload (json "body").