Test bundle could not be loaded because an unanticipated error
If other readers are getting this error, and you're using Carthage to add a framework, ensure the Copy Files phase is with Destination: Frameworks.
If you accidentally add the frameworks to a Copy Files phase with a different target (other than Frameworks), or Copy Bundle Resources, this will also produce the damaged / invalid bundle error message.
I had a similar problem. For me, the problem was a unit testing framework that was a dynamic framework but not copied over to the xctest bundle.
The solution was to add a "Copy Files" phase to my unit test target, set its destination to "Frameworks" and add my framework as an input file.
I was able to resolve this issue by setting the host application for the test target: