* If using JUnit 5, an explicit `runtimeOnly` dependency on `junit-platform-launcher` is required
  in addition to the existing `implementation` dependency on the test engine.
  * If using JUnit 4, only the existing `implementation` dependency on `junit` 4 is required.
  * If using JUnit 3, a test `runtimeOnly` dependency on `junit` 4 is required in addition to a
  `compileOnly` dependency on `junit` 3.

For the main project build scripts and precompiled project script plugins:

* Dependency and artifact configurations (such as `implementation` and `runtimeOnly` contributed by the Java Plugin)
* Project extensions and conventions (such as `sourceSets`), and extensions on them
* Extensions on the `dependencies` and `repositories` containers, and extensions on them