Asynchronous unit testing Core Data with Xcode 6

Wed, 06 Aug 2014 19:52:11 +0000

The WordPress for iOS project had a number of unit tests using Core Data and a custom asynchronous test helper. The helper used a semaphore in a global scope and a bit of method swizzling to give a wait/notify mechanism. The problem with this solution was the global semaphore and poorly written tests causing a conflict. Tests would call the ending wait and previous tests running Core Data would fire off notifies causing a mismatch between the original test and the recipient of the message to pass by the current semaphore.

If you run Unit Tests in Xcode

Thu, 24 Apr 2014 21:31:18 +0000

If you run unit tests inside of Xcode, you may wish to turn on the behavior to show the test results after they run.

Go to Preferences in Xcode.
Click on the Behaviors tab.
Click on Succeeds.
Check the box shown and select "Show" then "Test Navigator".
Repeat step 4 for Fails as well.

Now when your tests finish (failed or succeeded) you'll see the pretty green or red marks.

Unit Test on The Dangling Pointer

Asynchronous unit testing Core Data with Xcode 6

If you run Unit Tests in Xcode