public void ParseTreeValueExpressionEvaluator_EqvOperatorInts(int lhs, int rhs, int expected)
        {
            var result = ParseTreeExpressionEvaluator.Eqv(lhs, rhs);

            Assert.AreEqual(expected, result);
        }
        public void ParseTreeValueExpressionEvaluator_EqvOperatorBoolean(bool lhs, bool rhs, bool expected)
        {
            var result = ParseTreeExpressionEvaluator.Eqv(lhs, rhs);

            Assert.AreEqual(expected, result);
        }