### Question:
ProviderConfigEmptyPresenter implements ProviderConfigurationForm { public void isValid(final Callback<Boolean> callback) { callback.callback(false); } @Inject  ProviderConfigEmptyPresenter(final View view); @PostConstruct void init(); View getView(); @Override void addContentChangeHandler(final ContentChangeHandler contentChangeHandler); @Override ProviderConfiguration buildProviderConfiguration(); @Override void clear(); void isValid(final Callback<Boolean> callback); @Override String getWizardTitle(); @Override void disable(); @Override void load(final Provider provider);  }### Answer:
@Test public void testIsValid() { presenter.isValid(Assert::assertFalse); }