### Question:
JsonWrapper { @Override public int hashCode() { return this.jsonString.hashCode(); } JsonWrapper();  JsonWrapper(String jsonString);  JsonWrapper(JsonObject jsonObject); JsonObject toJsonObject(); @Override String toString(); abstract JsonWrapper clone(); @Override int hashCode(); @Override boolean equals(Object o); static final String EMPTY_JSON; }### Answer:
@Test public void testHashCode() { assertEquals(empty.toString().hashCode(), empty.hashCode()); assertEquals(m1.toString().hashCode(), m1.hashCode()); assertEquals(m2.toString().hashCode(), m2.hashCode()); }