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    <p>You've nearly got it. The problem is that the <a href="http://c2.com/cgi/wiki?ClassUnderTest" rel="nofollow">Class Under Test</a> (<strong>CUT</strong>) is not built for unit testing - it has not <em>really</em> been <a href="http://en.wikipedia.org/wiki/Test-driven_development" rel="nofollow">TDD</a>'d.</p> <p>Think of it like this&hellip;</p> <ul> <li>I need to test a function of a class - let's call it <em>myFunction</em></li> <li>That function makes a call to a function on another class/service/database</li> <li>That function also calls another method on the <strong>CUT</strong></li> </ul> <p>In the unit test</p> <ul> <li>Should create a concrete <strong>CUT</strong> or <code>@Spy</code> on it</li> <li>You can <code>@Mock</code> all of the other class/service/database (i.e. external dependencies) </li> <li>You <em>could</em> stub the other function called in the <strong>CUT</strong> but it is not really how <em>unit</em> testing should be done</li> </ul> <p>In order to avoid executing code that you are not strictly testing, you could abstract that code away into something that can be <code>@Mock</code>ed.</p> <p>In this <em>very</em> simple example, a function that creates an object will be difficult to test</p> <pre><code>public void doSomethingCool(String foo) { MyObject obj = new MyObject(foo); // can't do much with obj in a unit test unless it is returned } </code></pre> <p>But a function that uses a service to get MyObject is easy to test, as we have abstracted the difficult/impossible to test code into something that makes this method testable.</p> <pre><code>public void doSomethingCool(String foo) { MyObject obj = MyObjectService.getMeAnObject(foo); } </code></pre> <p>as MyObjectService can be mocked and also verified that .getMeAnObject() is called with the <em>foo</em> variable.</p>
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    1. POUsing Mockito to stub and execute methods for testing
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    1. COif _myFunction_ and _myFunction2_ are part of the **CUT**, and _myFunction_ calls _myFunction2_ as stated in your example, wouldn't Spy based partial mocking be the only option? should _myFunction2_ be moved out of the **CUT** and "injected" even though it is an integral part of the **CUT** responsibility? what am i missing?
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    2. COI don't think you are missing anything. Spy based partial mock is the best option, although you _could_ just test both methods together. My example was more about the problem when methods in the *CUT* create objects that you might want to verify behaviour on or assert values in, and that could be accomplished by refactoring the *CUT* to use a factory or external service to create those objects which _can_ be mocked and injected.
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    3. COthanks ... makes sense ...
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