Question

If I have a function which accepts an out parameter and accepts an input form console –

public void Test(out int a)
{
     a = Convert.ToInt16(Console.ReadLine());  
}

How can I accept an input using Console.Readline() during NUnit test? How can I use NUnit to test this method?

I tried using this code for my NUnit test case –

[TestCase]
public void test()
{
     int a = 0;   
     ClassAdd ad = new ClassAdd();
     ad.addition(out a);

     //a should be equal to the value I input through console.Readline()
     Assert.AreEqual(<some value I input>, a, "test");    
}

how can I test a method which accepts an out parameter and also accepts an user input from Console?

Answer 1

You can use the SetIn method of System.Console to set the the input source:

StringReader reader = new StringReader("some value I input" + Enivronment.NewLine);
Console.SetIn(reader);

int a = 0;   
ClassAdd ad = new ClassAdd();
ad.addition(out a);

Assert.AreEqual(<some value I input>, a, "test");

EDIT: To test multiple values, just separate each input with a new line:

string[] lines = new[] { "line1", "line2" };
StringReader input = new StringReader(String.Join(Environment.NewLine, lines));
Console.SetIn(input);

string input1 = Console.ReadLine();    //will return 'line1'
string input2 = Console.ReadLine();    //will return 'line2'