### Question:
FSSkinReference implements SkinReference { @Override public String serialize() { return String.format("SkinFS[%s]", skinName); } FSSkinReference(String skinName); String getSkinName(); @Override boolean equals(Object o); @Override int hashCode(); @Override String serialize(); @Override String toString();  }### Answer:
@Test public void serialize() throws Exception { assertEquals("SkinFS[skin]", new FSSkinReference("skin").serialize()); }