How to use

passphraseStream

method

in

com.commonsware.android.diceware.PassphraseViewModel

@Override
public void onViewCreated(View view, Bundle state) {
 super.onViewCreated(view, state);
 passphrase=view.findViewById(R.id.passphrase);
 viewModel=ViewModelProviders
  .of(this, new PassphraseViewModel.Factory(getActivity(), state))
  .get(PassphraseViewModel.class);
 updateMenu();
 viewModel.passphraseStream().observe(this,
  newPhrase -> passphrase.setText(newPhrase));
}

 @Test
 public void words() throws InterruptedException {
  PassphraseViewModel vm=
   new PassphraseViewModel(InstrumentationRegistry.getTargetContext(), null);
  final LiveData<String> words=vm.passphraseStream();
  final Observer<String> observer=strings -> {
   result=strings;
   countDownLatch.countDown();
  };

  words.observeForever(observer);
  assertTrue(countDownLatch.await(2, TimeUnit.SECONDS));
  assertTrue(result.length()>11);

  countDownLatch=new CountDownLatch(1);

  String original=result;

  vm.setCount(7);
  assertTrue(countDownLatch.await(2, TimeUnit.SECONDS));
  assertNotEquals(original, result);
  assertTrue(result.length()>13);

  InstrumentationRegistry.getInstrumentation()
   .runOnMainSync(() -> words.removeObserver(observer));
 }
}