title: Unable to execute tests from command line via xcodebuild
body: <p>I am trying to build and run test cases using command line for iOS test cases.
  I have given the following command:</p>
  
  <pre><code>xcodebuild -target AppEngineTests -configuration Debug -sdk iphonesimulator TEST_AFTER_BUILD=YES clean build
  </code></pre>
  
  <p>It builds the app but the testcases are not run.</p>
  
  <p>could someone please help?
  Thanks</p>