title: How can I determine what percentage of Github projects contain unit tests?
body: <p>I'm working on a presentation about unit testing and TDD. One statistic I'd like to share is the percentage of Github projects that contain unit tests. Is this data available somewhere?</p>
  
  <p>If not, is it possible to obtain through a Github API? I was considering a simple file-based approach based on project type (see if a Java project has any files ending in <code>Test.java</code>, or <code>spec.rb</code> for Ruby), but I've never used their API and don't know how feasible this is.</p>