One of my friends recently went to an interview to a very well known startup company. It is supposed to hire only the very best technical people in the industry. One of the problems that he was asked to write a unit test was,

Suppose a string has numbers separated by arithmetic operators, how do you compute the value of it?

BTW, I personally feel that you are not really testing the knowledge of a person by asking such questions and expecting them to solve it in 6 minutes.

**Solution**

using Microsoft.VisualStudio.TestTools.UnitTesting; using System; using System.Data; namespace UnitTestProject1 { [TestClass] public class UnitTest1 { [TestMethod] public void TestMethod1() { var operator1= new Operator(); int result = operator1.Maths("2+3"); Assert.AreEqual(result, 5); } [TestMethod] public void TestMethod2() { var operator1 = new Operator(); int result = operator1.Maths("2+3*4"); Assert.AreEqual(result, 14); } [TestMethod] public void TestMethod3() { var operator1 = new Operator(); int result = operator1.Maths("2+3*10/5"); Assert.AreEqual(result, 8); } } public class Operator { public int Maths(string operation) { object result=new DataTable().Compute(operation, null); return Int32.Parse(result.ToString()); } } }