Path path = tempDir.resolve("nonexistent.file");
    assertTrue(Files.exists(path.getParent()));
    MoreFiles.createParentDirectories(path); // test that there's no exception
  }

  public void testCreateParentDirectories_oneParentNeeded() throws IOException {
    Path path = tempDir.resolve("parent/nonexistent.file");
    Path parent = path.getParent();
    assertFalse(Files.exists(parent));
    MoreFiles.createParentDirectories(path);