Question

The function below gets input from the user. I need to test this function using Unit Testing. Can anyone tell me how to test this kind of function which require user input dynamically. Thanks

like boundary value analysis …

numberOfCommands should be (0 <= n <= 100)

public static int Get_Commands()
{
    do
    {
        string noOfCommands = Console.ReadLine().Trim();
        numberOfCommands = int.Parse(noOfCommands);             
    }
    while (numberOfCommands <= 0 || numberOfCommands >= 100);  

    return numberOfCommands;
}

Programmatically hint will be great help!

Answer 1

Create an interface and pass in the interface to receive text. Then, in your unit test, pass in a mock interface that automatically returns some result.

Edit for code details:

public interface IUserInput{
    string GetInput();
}

public static int Get_Commands(IUserInput input){
    do{
       string noOfCommands = input.GetInput();
       // Rest of code here
    }
 }

public class Something : IUserInput{
     public string GetInput(){
           return Console.ReadLine().Trim();
     }
 }

 // Unit Test
 private class FakeUserInput : IUserInput{
      public string GetInput(){
           return "ABC_123";
      }
 }
 public void TestThisCode(){
    GetCommands(new FakeUserInput());
 }