public void CanRead_NonEmptyString_ReturnsTrue()
        {
            RawExpression expression = new RawExpression("foo");

            Assert.True(expression.CanRead());
        }
        public void CanRead_EmptyString_ReturnsFalse()
        {
            RawExpression expression = new RawExpression("");

            Assert.False(expression.CanRead());
        }