public void NotEqualToObjectOfDifferentType()
        {
            var obj1 = new Vigesimal(854);
            var obj2 = new NotAVigesimal();

            Assert.False(obj1.Equals(obj2));
        }
        public void NotEqualToNull()
        {
            var obj1 = new Vigesimal(854);

            Assert.False(obj1.Equals(null));
        }