def args = transformer.transform(spec)

        then:
        assertHasArguments(args, "-I", includes)
        assertHasArguments(args, "-isystem", systemIncludes)

        and:
        args.indexOf(includes.last().absoluteFile.toString()) < args.indexOf(systemIncludes.first().absoluteFile.toString())
    }

    boolean assertHasArguments(List<String> args, String option, List<File> files) {
        files.each { file ->

        spec.includeRoots >> includes
        spec.systemIncludeRoots >> systemIncludes

        when:
        def args = transformer.transform(spec)

        then:
        assertHasArguments(args, "/I", includes)
        assertHasArguments(args, "/I", systemIncludes)

        and:
        args.indexOf("/I" + includes.last().absoluteFile.toString()) < args.indexOf("/I" + systemIncludes.first().absoluteFile.toString())
    }