### Question:
InstructionDeserializerKey extends MessageCodeKey { @Override public String toString() { return super.toString() + " experimenterID: " + experimenterId; } InstructionDeserializerKey(short version, int type,
            Long experimenterId); @Override int hashCode(); @Override boolean equals(Object obj); @Override String toString();  }### Answer:
@Test public void testToString(){ InstructionDeserializerKey key1 = new InstructionDeserializerKey(EncodeConstants.OF10_VERSION_ID, 11, null); Assert.assertEquals("Wrong toString()", "msgVersion: 1 objectClass: org.opendaylight.yang.gen.v1.urn.opendaylight" + ".openflow.common.instruction.rev130731.instructions.grouping.Instruction msgType: 11" + " experimenterID: null", key1.toString()); }