### Question:
DataTypeListItemView implements DataTypeListItem.View { @Override public boolean isCollapsed() { return isCollapsed(getArrow()); } @Inject  DataTypeListItemView(final HTMLDivElement view,
                                final TranslationService translationService,
                                final @DMNEditor ReadOnlyProvider readOnlyProvider); @Override void init(final DataTypeListItem presenter); @Override HTMLElement getElement(); @Override void toggleArrow(final boolean show); @Override void expand(); @Override void collapse(); @Override void showEditButton(); @Override void showSaveButton(); @Override void enableFocusMode(); @Override void disableFocusMode(); @Override boolean isOnFocusMode(); @Override String getName(); @Override void setName(final String name); @Override void showDataTypeNameInput(); @Override void hideDataTypeNameInput(); @Override void setupSelectComponent(final DataTypeSelect typeSelect); @Override void setupConstraintComponent(final DataTypeConstraint dataTypeConstraintComponent); @Override void setupListComponent(final SmallSwitchComponent dataTypeListComponent); @Override void showListContainer(); @Override void hideListContainer(); @Override void showListYesLabel(); @Override void hideListYesLabel(); @Override boolean isCollapsed(); @Override void setDataType(final DataType dataType); static final String UUID_ATTR; static final String NAME_DATA_FIELD; static final String PARENT_UUID_ATTR; }### Answer:
@Test public void testIsCollapsedWhenArrowIsARightArrow() { final DOMTokenList classList = mock(DOMTokenList.class); final HTMLElement arrow = mock(HTMLElement.class); arrow.classList = classList; when(classList.contains(RIGHT_ARROW_CSS_CLASS)).thenReturn(true); assertTrue(view.isCollapsed(arrow)); }
@Test public void testIsCollapsedWhenArrowIsNotARightArrow() { final DOMTokenList classList = mock(DOMTokenList.class); final HTMLElement arrow = mock(HTMLElement.class); arrow.classList = classList; when(classList.contains(RIGHT_ARROW_CSS_CLASS)).thenReturn(false); assertFalse(view.isCollapsed(arrow)); }