title: How do I use godep with testing packages
body: <p>I have just started using <a href="https://github.com/tools/godep" rel="nofollow">godep</a> for the first time. When I ran <code>godep save</code>, the <code>Godeps.json</code> file did not include <a href="https://github.com/stretchr/testify" rel="nofollow">testify</a> which is a dependency for my unit tests.</p>
  
  <p><code>go get -t</code> would see <a href="https://github.com/stretchr/testify" rel="nofollow">testify</a>, how do I tell godep to include my test dependencies?</p>