title: How to install and edit a ruby gem from a debugging branch on GitHub
body: <p>I am trying to test a branch of a GitHub repo.</p>
  
  <p><code>gem install gemName</code> installs the master branch.</p>
  
  <p>I've tried the answers <a href="https://stackoverflow.com/questions/2823492/install-gem-from-github-branch">here</a> without luck.</p>
  
  <p>I don't how to use <a href="https://rubygems.org/gems/gem-install-branch/versions/0.0.3" rel="nofollow noreferrer">this gem</a> either.</p>
  
  <p>And how could I edit the gem afterwards?</p>