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Unit Testing on macOS: Part 2/2

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In the second part of our Unit testing tutorial for macOS you'll learn about UI tests and code coverage and you learn how to test asynchronous code.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/971-unit-testing-on-macos-part-2-2
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Sarah,

Thank you so much for creating this tutorial! I’ve worked through the first tutorial yet hit a snag early on part 2 and was wondering if you could help:
Added the new ViewControllerTests file and set the Storyboard ID in the Identity Inspector, only to find that I get an NSInvalidArgumentException (??) Tried to check against the completed version and didn’t notice any difference. Is there possibly something else which may have been overlooked?

Screen Shot 2016-10-02 at 9.29.53 PM.png1894×578 93.1 KB

Thank you again!

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Hi,

Glad you are enjoying the tutorial.

I have encountered this problem with Xcode several times in various projects. I have a number of things I try and eventually one works :]

  1. In Xcode: Product menu → Clean
  2. In Xcode: Product menu, hold down Option → Clean Build Folder
  3. In Finder: go to ~/Library/Developer/Xcode/DerivedData and delete any folders relating to this project
  4. In Xcode: clear the Storyboard ID, build the app, then re-enter the Storyboard ID making sure there are no invisible characters (I usually just copy & paste from the Class field).

Hopefully one of all of these will solve the problem.

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This tutorial is more than six months old so questions are no longer supported at the moment for it. We will update it as soon as possible. Thank you! :]