How to set a dependency for a project with all subprojects?

Question

I don't like that I repeat every repository dependency (let us say, junit), for the main project and for subprojects. Is there a possibility to make the subproject to use the dependencies of the main project. Or is there another way to escape that repetition?

Answer 1

root/build.gradle

allprojects {
    if (plugins.hasPlugin('java')) {
        dependencies {
            testCompile 'junit:junit:4.12'
        }
    }
}