AppBarLayoutHandler extends LinearLayoutHandler { @Override public boolean isVertical(@NotNull NlComponent component) { return true; }  @Override @NotNull List<String> getInspectorProperties(); @NotNull @Override List<String> getLayoutInspectorProperties(); @Override boolean onCreate(@NotNull ViewEditor editor,
                          @Nullable NlComponent parent,
                          @NotNull NlComponent newChild,
                          @NotNull InsertType insertType); @Override boolean isVertical(@NotNull NlComponent component);  }
@Test public void isVertical() throws Exception { Assert.assertTrue(new AppBarLayoutHandler().isVertical(mock(NlComponent.class))); }