public void ExtensionShouldBeNotEqual_DifferentReduceExpression()
        {
            var x = StubExpression.Extension(StubObject.Expressions.Default);
            var y = StubExpression.Extension(StubObject.Expressions.Constant);

            AssertAreNotEqual(x, y);
        }
        public void ExtensionShouldBeEqual_SameReduceExpression()
        {
            var x = StubExpression.Extension(Expression.Empty());
            var y = StubExpression.Extension(Expression.Empty());

            AssertAreEqual(x, y);
        }