}
    }

    /**
     * Implementation code that can be unit-tested.
     *
     * <p>Visible for testing.</p>
     */
    class Implementation(private val excludes: List<String>) {
        fun collectPackages(files: Iterable<Path>): Trie {
            val builder = Trie.Builder()
            for (file in files) {
                if (Files.exists(file)) {
                    if (file.fileName.toString().endsWith(".jar")) {

    val implementation = PackageListGenerator.Implementation(DEFAULT_EXCLUDES_FOR_TEST)

    private
    fun getRelocatedPackages(files: Sequence<Path>): List<String> = mutableListOf<String>().apply {
        implementation.collectPackages(files.toList()).dump(false, this::add)
    }

    @Test
    fun `generates a curated list of package prefixes from directories`() {
        assertEquals(EXPECTED_PACKAGE_LIST, getRelocatedPackages(someClasses()))