Can I assert that a C# method has a certain attribute?

Question

[DummyAttribute]
public void DummyMethod() {
  return;
}

I want to write a Nunit test that will assert that DummyMethod is decorated with DummyAttribute, can I do that ?

Answer 1

Yes, with reflection. One possible solution:

var dummyAttribute = typeof(YourClassName)
    .GetMethod(nameof(YourClassName.DummyMethod))!
    .GetCustomAttributes(inherit: false)
    .OfType<DummyAttribute>()
    .SingleOrDefault();

Assert.That(dummyAttribute, Is.Not.Null);