ClickCountViewModel extends ViewModel { @Bindable public String getClickCountText() { return String.format(appContext.getString(R.string.click_count), clicks); } ClickCountViewModel(@NonNull ActivityComponent activityComponent,
                        @Nullable State savedInstanceState); @Override State getInstanceState(); @Bindable String getClickCountText(); void onClickButton(); void onClickHiBrianLee();  }
@Test public void testViewModel() { assertEquals("0", viewModel.getClickCountText()); }