public static void CompareTo_Some_WithSome_AndNotEqual()
 {
     Assert.Equal(1, Two.CompareTo(One));
     Assert.Equal(-1, One.CompareTo(Two));
 }
 public static void CompareTo_Some_WithNone()
 {
     Assert.Equal(1, One.CompareTo(Ø));
     Assert.Equal(1, Two.CompareTo(Ø));
 }