public void ShouldSetParent() { var nuGetPublisher = new NuGetPublisher(); var subject = new DescriptionMandatory(nuGetPublisher); var optionResult = subject.Description("description"); Assert.That(nuGetPublisher._description, Is.EqualTo("description")); Assert.That(optionResult, Is.Not.Null); Assert.That(optionResult._parent, Is.EqualTo(nuGetPublisher)); }