<p>It's hard to be sure since that's not a complete test case, but check here:</p>
<pre><code>:params => { :display_name => administrator_user.display_name, :id => public_trace_file.id }
</code></pre>
<p>Is <code>public_trace_file</code> actually owned by <code>administrator_user</code>? I would expect the <code>display_name</code> to be a regular user here (e.g. <code>public_trace_file.user.display_name</code>). You are trying to log in as an administrator (the session part of the command) but the trace you are trying to delete should by owned by a normal user, for the test to be correct.</p>

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