public Optional<MountOptions> getMountOptions() {
    return getMountCliOptions().map(MountCliOptions::getMountOptions);
  }
@Test
  public void testGetMountOptions() {
    mJCommander.parse("-m", "/tmp/fuse-mp", "-o", "ro", "-o", "key=value");
    assertEquals(Optional.of(new MountOptions(ImmutableMap.of("ro", "", "key", "value"))),
        mOptions.getMountOptions());
  }