title: How do I run tox in a project that has no setup.py?
body: <p>I would like to use <code>tox</code> to run my unittests in two virtualenvs, since my application has to support 2 different Python versions.</p>
  
  <p>My problem is that <code>tox</code> requires a <code>setup.py</code>, but I have none since my application is not a module and has its own installer. For now I don't want to go through the hassle of automating the install process as to work with <code>setup.py</code>, I just want to run my unittests without having to write a <code>setup.py</code>.</p>
  
  <p>Is that possible? Or how can I write an "empty" setup.py that simply does nothing? Can you point me towards some documentation on the subject (the <code>distutils</code> documentation explains how to write a meaningful <code>setup.py</code>, not an empty one)?</p>