static void testMakingUserPermissionsFromScratch() throws IOException {
    // All we're testing is whether it throws.
    FileAttribute<?> unused = JavaNioCreator.userPermissions().get();
  }

  @IgnoreJRERequirement // used only when Path is available
  private static final class JavaNioCreator extends TempFileCreator {
    @Override
    File createTempDir() {
      try {
        return java.nio.file.Files.createTempDirectory(