public void ParseSimpleCompareExpression()
{
IExpression expression = this.ParseExpression("b <= 1");
Assert.IsNotNull(expression);
Assert.IsInstanceOfType(expression, typeof(CompareExpression));
CompareExpression operation = (CompareExpression)expression;
Assert.AreEqual(ComparisonOperator.LessEqual, operation.Operation);
Assert.IsNotNull(operation.LeftExpression);
Assert.IsInstanceOfType(operation.LeftExpression, typeof(VariableExpression));
Assert.IsNotNull(operation.RightExpression);
Assert.IsInstanceOfType(operation.RightExpression, typeof(ConstantExpression));
}