### Question:
SemanticSelector extends HashMap<Type, List<SelectorElement>> implements SelectorQueryVisitable { @Override public String toString() { final StringBuilder builder = new StringBuilder(); for (final Map.Entry<Type, List<SelectorElement>> item : this.entrySet()) { final List<SelectorElement> elements = item.getValue(); builder.append("["); builder.append(StringUtils.join(elements, ',')); builder.append("]"); } return builder.toString(); }  void addSelector(final Type type, final SelectorElement se); @Override SelectorQueryPlan accept(SelectorQueryVisitor selectorQueryVisitor); @Override String toString();  }### Answer:
@Test public void testToString() { assertTrue(selector.toString().isEmpty()); }