Class Foo is implemented in both MyApp and MyAppTestCase. One of the two will be used. Which one is undefined

Question

Recently I started Unit testing my application. This project (in Xcode4) was created without a unit test bundle so I had to set it up. I have followed the steps from here: h

Answer 1

For me this happened because I deployed to the device and then to the simulator as I have NSZombies enabled. The solution was to switch to the simulator configuration & do a Product -> Clean then switch to the device configuration & do the same. Error went away. It's to do with build cache.