### Question:
JsonWrapper { @Override public boolean equals(Object o) { return o == this || (o instanceof JsonWrapper && this.jsonString.equals(o .toString())); } 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 testEquals() { assertFalse(empty.equals(m1)); assertFalse(m1.equals(empty)); assertFalse(empty.equals(m2)); assertFalse(m2.equals(empty)); assertTrue(m1.equals(m2)); assertTrue(m2.equals(m1)); assertTrue(empty.equals(empty)); assertTrue(m1.equals(m1)); assertTrue(m2.equals(m2)); }
@Test public void testEqualsWrongObject() { assertFalse(empty.equals(new String(JsonWrapper.EMPTY_JSON))); }