### Question:
GroupByAvailableActiveLayersTreeBuilder extends GroupByDefaultTreeBuilder { @Override public String getGroupByName() { return "Active"; }  @Override String getGroupByName(); @Override GroupCategorizer getGroupCategorizer();  }### Answer:
@Test public void testGetGroupByName() { GroupByAvailableActiveLayersTreeBuilder builder = new GroupByAvailableActiveLayersTreeBuilder(); assertEquals("Active", builder.getGroupByName()); }