when:
        withBuildCache().run 'assemble'

        then:
        executedAndNotSkipped ':b:jar'
        executedAndNotSkipped ':a:jar'

        when:
        make_abi_breaking_change_on_b()

        withBuildCache().run 'clean', 'assemble'

        then:
        executedAndNotSkipped ':b:jar', ':a:compileJava'
    }

    void make_abi_compatible_change_on_b() {