title: Android Testing: Instrumentation run failed due to 'java.lang.ClassNotFoundException'
body: <p>I have 3 test classes for a particular package from my main application. My first test class is running just fine, the other 2 aren't.</p>
  
  <p>When I try to run those 2 tests, I get the following error:</p>
  
  <pre><code>Instrumentation run failed due to 'java.lang.ClassNotFoundException'
  </code></pre>
  
  <p>I already verified:</p>
  
  <ul>
  <li>if the build path was properly configured, </li>
  <li>if the target package is correct,</li>
  <li>if I had problems with importing jUnit.</li>
  </ul>
  
  <p>Any guess about what the problem is?</p>
  
  <p>-----//-----</p>
  
  <p><strong>Solution:</strong></p>
  
  <p>I changed the version of jUnit I was using and the tests perform as they should.</p>