Can NotBeNull() keep the property type?

[mu88]

Hey guys 👋🏻

The following code does not compile at the moment:

var testee = new HttpResponseMessage(HttpStatusCode.Accepted);
testee.Should().NotBeNull().And.Subject.StatusCode.Should().Be(HttpStatusCode.Accepted);

Is it somehow possible that NotBeNull() keeps the property type (here HttpResponseMessage) instead of falling back to object?

[dennisdoomen]

Because of limitations of the compiler, we cannot define a generic Should extension method on T and still have more specific extension method for types like IEnumerable<T>, etc. That's why your example is using the non-generic ObjectAssertions.

There's a rather ugly workaround:

testee.Should().NotBeNull().And.Subject.As<HttpResponseMessage>().StatusCode.Should().Be(HttpStatusCode.Accepted);

But my recommendation is to replace this call with:

testee.Should().BeEquivalentTo(new
{
    StatusCode = HttpStatusCode.Accepted
});

[mu88]

Thanks Dennis, got it!