public void Bind()
        {
            ConstantTerm term  = new ConstantTerm();
            ConstantTerm term2 = new ConstantTerm();

            term.Bind(term2);

            Assert.AreSame(term, term.Reference());
        }
        public void Reference()
        {
            ConstantTerm term1 = new ConstantTerm();
            ConstantTerm term2 = new ConstantTerm();

            term1.Bind(term2);

            Assert.AreSame(term1, term1.Reference());
        }