### Question:
BookieId { @Override public int hashCode() { return this.id.hashCode(); } private  BookieId(String id); @Override String toString(); static BookieId parse(String serialized); String getId(); @Override int hashCode(); @Override boolean equals(Object obj);  }### Answer:
@Test public void testHashcode() { assertEquals(BookieId.parse("test").hashCode(), BookieId.parse("test").hashCode()); }