* c.g.c.io.Files.createTempDir?
     */
    File fullPath = new File(Files.createTempDir(), name);
    File jarFile = pickAnyJarFile();
    Files.copy(jarFile, fullPath);
    return fullPath.toURI().toURL();
  }

  private static File pickAnyJarFile() throws IOException {
    for (ClassPath.LocationInfo location :
        ClassPath.locationsFrom(ClassPathTest.class.getClassLoader())) {

  }

  @Test
  fun httpUrl() {
    val httpUrl: HttpUrl = "".toHttpUrl()
    val isHttps: Boolean = httpUrl.isHttps
    val url: URL = httpUrl.toUrl()
    val uri: URI = httpUrl.toUri()
    val scheme: String = httpUrl.scheme
    val encodedUsername: String = httpUrl.encodedUsername
    val username: String = httpUrl.username

            for (File file : extClassPath) {
                slf4jLogger.debug("  included '{}'", file);

                extRealm.addURL(file.toURI().toURL());
            }

            for (CoreExtensionEntry entry : reverse(extensions)) {
                Set<String> exportedPackages = entry.getExportedPackages();
                ClassRealm realm = entry.getClassRealm();