using Moq;

using System;

public class Program

{

    public static void Main()

    {

        var mock = new Mock<IMockable>(MockBehavior.Strict);

        mock

            .Setup(m => m.DoSomething("12345"))

            .Returns("Hello");

        var result1 = mock.Object.DoSomething("12345");

        Console.WriteLine($"Output with correct input: {result1}");

​

        var result2 = mock.Object.DoSomething("Incorrect");

        Console.WriteLine($"Output with incorrect input: {result2}");

    }

}

​

public interface IMockable

{

    string DoSomething(string parameter);

}

​