I'm developing a modular app with >30 modules, where each module has its own Unit test target. I also have a special test scheme which runs all Unit tests from all the targets.
The problem is - it's too slow. While the tests run fast, it takes a lot of time for Xcode to switch from one test target to another. The "all tests" scheme is supposed to be run in CI so I would really like to improve the performance.
I tried to convert all Unit test targets into static frameworks and link them to a new "merged" Unit test target. In this target I then created a single AllTests.swift file importing the frameworks and manually invoked tests on each of them. The performance improvement was ~4x.
However, this will be quite hard to maintain this file. My assumption is, since they are linked statically, there can be a way to make Xcode run imported in such a way tests automatically. If this works I'll be able to fully automate this process, keeping test targets for development and generating the "merged" target in CI.
What else I tried:
- Investigated the option of using SourceKitten to parse the project and generate the AllTests.swift file automatically. This would require building the project one more time, eliminating the performance improvement.
- Instead of linking frameworks, include references to source files into the merged target. This introduces a bunch of "multiple files with the same name" and "same declaration" errors that cannot be automatically resolved.
- Made all declarations in the static frameworks public.
- Googled a lot. This SO question is quite close but the solution doesn't work for me.
So the main question is - is there a way to make Xcode automatically include Unit tests that are part of a static framework the current target is linked against? Or any other suggestion on how I can automate this process will be very much appreciated.