Should parallel execution of tests work?

[esemusa]

TLDR: Should parallel execution of tests work (by choosing Xcode parallelization)?

I can provide a minimum working example but I guess it's not needed as this does not seem to be a setup-dependent issue. But here is how to reproduce, trying to achieve test execution:

• In Xcode, choose „Edit Scheme…“ (be sure to select the right one)
• select the „Test“ tab
• Select „Options“
• select „Execute in parallel (if possible)“
• Try to run tests as usual

My observation:

• Xcode will start a new emulator „Cone 1 […]“.
• The app is built
• Tests won't run
• In the logs, you'll find this and only this:
  • DATE CucumberSwiftParallelUITests-Runner[7950:157096] Running tests...
• XCode will show the following execution feedback:
  • PROJECT | Build Succeeded | Today at TIME

My expectation:
If you define two .feature Files and run tests in parallel as stated above, the two .feature files should be executed in parallel

[Tyler-Keith-Thompson]

Short answer, yeah it should work. Can I get more information from you about what version of Xcode, CucumberSwift, and Swift you are using? Unfortunately Apple doesn't provide very good tie-ins to XCTest for this so, like many other libraries, I've got some swizzling happening to try and support parallel test execution and inject the Cucumber tests.

This is a bit of a tricky feature since that's prone to break with new releases, and because it's so darn hard to write a test for.

[esemusa]

Xcode 12.5
Swift: 5.4
CucumberSwift 3.3.4

I downloaded your sample app project https://github.com/Tyler-Keith-Thompson/CucumberSwiftSample and also tried it there. Same result.

[Tyler-Keith-Thompson]

Alright after further investigation parallel test execution is working for unit testing targets, not working for UI testing targets. I suspect there's another method I need to swizzle in order to support it, I'll leave this as an enhancement request.