Support for running unit tests?

[Neurrone]

I'm attempting to add unit tests to my app. However, running swift test results in a no such module 'SwiftUI' error.

Is there any chance xtool could also support running tests?

[kabiroberai]

So you can build tests with the xtool-provided iOS SDK by using

swift build --build-tests --swift-sdk arm64-apple-ios-simulator

However you can't run these tests outside of macOS, because running them requires the iOS simulator which xtool doesn't provide. It might be possible to allow running tests on a physical iOS device, but that's going to be a pretty large effort (even Xcode itself doesn't support logical testing on physical devices.) Still worth keeping this issue open to track it.

In the meantime, two suggestions I have are

1. Run your unit tests on CI such as GitHub Actions, or
2. Separate your logic into a cross-platform target (ie one that doesn't import SwiftUI) and write unit tests that can work on Linux. This option can also leads to better, more modular code so it's probably worth considering.

[fluffywaffles]

Not sure if helpful, but I found this issue after running:

# from Linux, after installing the Xcode.xip via `xtool sdk install ~/downloads/[...].xip`
swift build --swift-sdk darwin --build-tests

and seeing the following error:

3 | import Testing
  |        `- error: no such module '_Testing_Foundation'

Without --swift-sdk darwin, the build errors out on import SwiftUI, similar to the original poster. But tests nevertheless don't quite seem to build on Linux, even with the Xcode SDK installed and selected for build.