public void Should_Return_Value_When_Property_Is_Null()
{
Address address = new Address { ZipCode = null };
var result = address.Return(x => x.ZipCode, "No zip code on file");
Assert.AreEqual("No zip code on file", result);
}
public void Should_Return_Value_When_Property_Is_Default_ValueType()
{
Address address = new Address { Number = 0 };
var result = address.Return(x => x.Number, -12345);
Assert.AreEqual(-12345, result);
}