buildFile << """
            sourceSets {
                custom
            }
            dependencies {
                customImplementation 'org:foo:1.0'
                customRuntimeOnly 'org:bar:1.0'
            }
        """
        def resolve = resolveClasspath 'customRuntime'

        when:
        foo.pom.expectGet()

        when:
        project.pluginManager.apply(JavaBasePlugin)
        def sourceSet = project.sourceSets.create('custom')

        then:
        def implementation = project.configurations.customImplementation
        !implementation.visible
        implementation.extendsFrom == [] as Set
        implementation.description == "Implementation only dependencies for source set 'custom'."
        !implementation.canBeConsumed