assertTrue(Files.isRegularFile(parent));
    Path file = parent.resolve("foo");
    assertThrows(IOException.class, () -> MoreFiles.createParentDirectories(file));
  }

  public void testCreateParentDirectories_symlinkParentExists() throws IOException {
    /*
     * We use a fake filesystem to sidestep:
     *
     * - flaky problems with Windows (b/136041958)
     *