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    <p>A good way to allow you to write stubs is to use <strong>dependency injection</strong>. <code>FirstDeep</code> depends on <code>SecondDeep</code> and in your test you want to replace <code>SecondDeep</code> with a stub.</p> <p>First change your existing code by extracting an interface for <code>SecondDeep</code> and then inject that into <code>FirstDeep</code> in the constructor:</p> <pre><code>interface ISecondDeep { Boolean SomethingToDo(String str); } class SecondDeep : ISecondDeep { ... } class FirstDeep { readonly ISecondDeep secondDeep; public FirstDeep(ISecondDeep secondDeep) { this.secondDeep = secondDeep; } public String AddA(String str) { var flag = this.secondDeep.SomethingToDo(str); ... } } </code></pre> <p>Note that <code>FirstDeep</code> no longer creates a <code>SecondDeep</code> instance. Instead an instance is injected in the constructor.</p> <p>In your test you can create a stub for <code>ISecondDeep</code> where <code>SomethingToDo</code> always returns true:</p> <pre><code>class SecondDeepStub : ISecondDeep { public Boolean SomethingToDo(String str) { return true; } } </code></pre> <p>In the test you use the stub:</p> <pre><code>var firstDeep = new FirstDeep(new SecondDeepStub()); </code></pre> <p>In production code you use the "real" <code>SecondDeep</code>:</p> <pre><code>var firstDeep = new FirstDeep(new SecondDeep()); </code></pre> <p>Using a dependency injection container and a stubbing framework can make a lot of this easier to do.</p> <p>If you don't want to rewrite your code you can use a framework for intercepting calls like <a href="http://research.microsoft.com/en-us/projects/moles/">Microsoft Moles</a>. In the next version of Visual Studio a similar technology will be available in the <a href="http://msdn.microsoft.com/en-us/library/hh549175%28v=vs.110%29.aspx">Fakes Framework</a>.</p>
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