public void ParseSimpleMultiply()
{
Parser parser = new Parser("10*20.");
IExpression expression = parser.ParseExpression();
Assert.IsNotNull(expression);
Assert.IsInstanceOfType(expression, typeof(MultiplyExpression));
MultiplyExpression multiplyexpression = (MultiplyExpression)expression;
Assert.IsInstanceOfType(multiplyexpression.LeftExpression, typeof(ConstantExpression));
Assert.IsInstanceOfType(multiplyexpression.RightExpression, typeof(ConstantExpression));
Assert.AreEqual(10, ((ConstantExpression)multiplyexpression.LeftExpression).Value);
Assert.AreEqual(20, ((ConstantExpression)multiplyexpression.RightExpression).Value);
}