Currently "Test-only dependencies" feature is disabled in the Swift Package Manager. It was implemented initially, but was removed in this commit.

https://stackoverflow.com/a/41407032

Test-only Dependencies When Using the Swift Package Manager

I've seen mentions of test-only dependencies when using the Swift package manager but haven't been able to get them to work. For example: https://lists.swift.org/pipermail/swift-evolution/Week-of-...

2:03 AM

おおお、初期に testDependencies 見た気がしてたんだけど使えなくなってるのか・・・

2:04 AM

Remove testDependencies from PackageDescription This feature was supposed to support dependencies only for the root package but at some point it stopped working however the API still remained open. This patch removes the public API. This is a valid and desired feature which is supposed to come back after it goes through proper review on swift evolution.

https://github.com/apple/swift-package-manager/commit/34b7826cb586b0769ea5f60a7718d7de599ce27f

Remove testDependencies from PackageDescription · apple/swift-package-manager@34b7826

This feature was supposed to support dependencies only for the root package but at some point it stopped working however the API still remained open. This patch removes the public API. This is a va...

2:05 AM

それだと Quick とか使いたくないですね・・・。