public void WithName_should_clone_not_modify()
{
var sut = new User("1234567890", "Karo Hero", "Meisterhirte");
var clone = sut.WithName("alter Karo Hero");
clone.Should().NotBe(sut);
clone.Should().NotBeEquivalentTo(sut);
clone.Name.Should().Be("alter Karo Hero");
sut.Name.Should().Be("Karo Hero");
}