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I have written in a couple of projects
```tasks.test {
    // Re-use downloaded artifacts to speed up test times
    environment("GRADLE_RO_DEP_CACHE", File(gradle.gradleUserHomeDir, "caches"))
}```
which is not entirely what you asked for, but sharing the parent's dependency cache with the child does help with build times

it doesn't seem to help much locally though

1. `./gradlew clean`
2. `./gradlew check` - 2 minutes
3. add 
```    tasks.withType&lt;Test&gt;().configureEach {
      // Help speed up TestKit tests by re-using     dependencies cache (this really helps GitHub Workflows)
      // <https://docs.gradle.org/current/userguide/dependency_resolution.html#sub:shared-readonly-cache>
      environment("GRADLE_RO_DEP_CACHE", gradle.gradleUserHomeDir.resolve("caches"))
    }```
4) `./gradlew clean`
5) `./gradlew check` - 2 minutes
6) `./gradlew check` - 30 seconds