### Question:
DecisionNavigatorView implements DecisionNavigatorPresenter.View { @Override public void hideDecisionComponentsContainer() { hide(decisionComponentsContainer); } @Inject  DecisionNavigatorView(final HTMLDivElement mainTree,
                                 final HTMLDivElement decisionComponentsContainer,
                                 final HTMLDivElement decisionComponents); @Override void init(final DecisionNavigatorPresenter presenter); @Override void setupMainTree(final DecisionNavigatorTreePresenter.View mainTreeComponent); @Override void setupDecisionComponents(final DecisionComponents.View decisionComponentsComponent); @Override void showDecisionComponentsContainer(); @Override void hideDecisionComponentsContainer();  }### Answer:
@Test public void testHideDecisionComponentsContainer() { final DOMTokenList classList = mock(DOMTokenList.class); decisionComponentsContainer.classList = classList; view.hideDecisionComponentsContainer(); verify(classList).add(HIDDEN_CSS_CLASS); }