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copied!<p>I suppose your <code>RunBankApplication</code> looks similar to this:</p> <pre><code>public void RunBankApplication() { var input = Console.ReadLine(); switch (input) { case "1": Console.WriteLine("Enter Account Number: "); break; case "2": Console.WriteLine("Hello World!"); break; default: break; } } </code></pre> <p>To get read of your fixed dependency on <code>Console</code> which makes your method untestable you should inject this dependency in constructor.</p> <p>You need an interface defining your dependency:</p> <pre><code>public interface IConsoleService { string ReadLine(); void WriteLine(string message); } </code></pre> <p>You create a default implementation for it:</p> <pre><code>public class ConsoleService : IConsoleService { public string ReadLine() { return Console.ReadLine(); } public void WriteLine(string message) { Console.WriteLine(message); } } </code></pre> <p>You then inject this implementation in your <code>BankManager</code> class and use it inside the class:</p> <pre><code>public class BankManager { private IConsoleService _consoleService; public BankManager(IConsoleService consoleService) { _consoleService = consoleService; } public void RunBankApplication() { var input = _consoleService.ReadLine(); switch (input) { case "1": _consoleService.WriteLine("Enter Account Number: "); break; case "2": _consoleService.WriteLine("Hello World!"); break; default: break; } } } </code></pre> <p>Now you can mock this dependency in your tests. <a href="http://code.google.com/p/moq/" rel="nofollow">Moq</a> is good choice of such a mocking library:</p> <pre><code>[TestClass] public class UnitTest1 { [TestMethod] public void GetMessage_Input1_ReturnEnterAccountNumberMessage() { var consoleService = new Mock<IConsoleService>(); consoleService.Setup(c => c.ReadLine()).Returns("1"); var bankManager = new BankManager(consoleService.Object); bankManager.RunBankApplication(); consoleService.Verify(c => c.WriteLine("Enter Account Number: "), Times.Once()); } [TestMethod] public void GetMessage_Input2_ReturnHelloWorldMessage() { var consoleService = new Mock<IConsoleService>(); consoleService.Setup(c => c.ReadLine()).Returns("2"); var bankManager = new BankManager(consoleService.Object); bankManager.RunBankApplication(); consoleService.Verify(c => c.WriteLine("Hello World!"), Times.Once()); } } </code></pre> <p>Sure, this is an overkill for such a simple example, but the approach is really useful in larger projects. As a next step you can then use an <a href="http://www.martinfowler.com/articles/injection.html" rel="nofollow">IoC container</a> to automatically inject your dependency in the application.</p>

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