title: Self-contained test library project cannot find the library classes
body: <p>According to <a href="http://developer.android.com/guide/developing/eclipse-adt.html#libraryProject" rel="noreferrer">this SDK guide</a>, unit-testing a Library project can be achieved by creating a standard application project, reference the Library project and then instrument the application for unit testing.</p>
  
  <p>However, when I do this and launch the test application I get the message</p>
  
  <blockquote>
    <p>No tests found with test runner 'JUnit 3'.</p>
  </blockquote>
  
  <p>I'm using Eclipse and the Android ADT plugin, all latest versions. </p>
  
  <p>Note: the projects compile just fine. The test project also installs fine to the emulator. But in the console I can see that it looks for <code>&lt;library&gt;.apk</code>, which of course doesn't exist since I'm compiling this as a library into the test project.</p>
  
  <p>Anyone got this to work? And if so, what is the trickery here?</p>
  
  <p><strong>Update:</strong> after discovering and fixing a problem, which was actually including the test classes (!), the test runner now can find all tests. <strong>But</strong>, all the tests fail with the following exceptions:</p>
  
  <blockquote>
    <p>java.lang.NoClassDefFoundError: &lt;nameOfClassInLibraryProject&gt;</p>
  </blockquote>
  
  <p><code>nameOfClassInLibraryProject</code> are classes defined in the library project. These classes should be compiled into the test project, and indeed, everything compiles just fine. But when running the test project, the runtime doesn't seem to find the library classes.</p>