title: What are the use-cases for local branches tracking other local branches?
body: <p>In Git we can do this:</p>
  
  <pre><code>$ git checkout -b testbranch --track master
  Branch testbranch set up to track local branch master.
  Switched to a new branch 'testbranch'
  </code></pre>
  
  <p>What are the use-cases of such branches?</p>