### Question:
ParamSet implements ParamHandler, Serializable { @Override public String toString() { return StrUtils.join(", ", getOptions()); } ParamSet();  ParamSet(String name, Object value, List<ParamSet> paramSets);  ParamSet(String name, Object value, ParamSet paramSet);  ParamSet(String name, Object value);  ParamSet(ParamSet paramSet); @Override boolean equals(final Object o); @Override int hashCode(); int size(); boolean isEmpty(); List<Object> get(String name); Object getSingle(String name); boolean contains(String name); ParamSet add(String name, Object value); ParamSet add(String name, Object value, ParamSet params); ParamSet add(String name, Object value, List<ParamSet> params); static void setParams(Object value, ParamSet param); static void setParams(Object value, List<ParamSet> params); ParamSet addAll(ParamSet paramSet); ParamSet clear(); @Override List<String> getOptionsList(); @Override void setOptionsList(final List<String> options); @Override ParamSet getParams(); @Override void setParams(final ParamSet param); @Override String toString();  }### Answer:
@Test public void testEmptyToString() { ParamSet paramSet; paramSet = new ParamSet(); Assert.assertEquals(paramSet.toString(), ""); }