How to use xcodebuild with -only-testing and -skip-testing flag?
<p>I've noticed that there are two options in <code>xcodebuild</code>'s man page.</p>

<pre><code>-only-testing:TEST-IDENTIFIER       
</code></pre>

<blockquote>
  <p>constrains testing by specifying tests to include, and excluding other tests</p>
</blockquote>

<pre><code>-skip-testing:TEST-IDENTIFIER       
</code></pre>

<blockquote>
  <p>constrains testing by specifying tests to exclude, but including other tests</p>
</blockquote>

<p>What I try:</p>

<pre><code>xcodebuild -workspace MyWorkSpace.xcworkspace / 
-sdk iphonesimulator / 
-destination id=7F52F302-C6AF-4215-B269-39A6F9913D5B / 
-scheme SCHEME-iOS / 
test -only-testing:???
</code></pre>

<p>What is <code>TEST-IDENTIFIER</code> mean ?</p>