.gradle folder in project

[Schalk_Cronje (Schalk Cronjé)]

That should work - we actually use a similar style in the JRuby-Gradle plugin as part of our testing - https://github.com/jruby-gradle/jruby-gradle-plugin/blob/master/jruby-gradle-base-plugin/src/gradleTest/jrubyExec/build.gradle#L12