### Question:
Replicator implements ThreadId.OnError { public static boolean stopTransferLeadership(final ThreadId id) { final Replicator r = (Replicator) id.lock(); if (r == null) { return false; } r.timeoutNowIndex = 0; id.unlock(); return true; } Replicator(final ReplicatorOptions replicatorOptions, final RaftOptions raftOptions); @OnlyForTest PriorityQueue<RpcResponse> getPendingResponses(); static ThreadId start(final ReplicatorOptions opts, final RaftOptions raftOptions); static void waitForCaughtUp(final ThreadId id, final long maxMargin, final long dueTime,
                                       final CatchUpClosure done); @Override String toString(); @Override void onError(final ThreadId id, final Object data, final int errorCode); static void sendHeartbeat(final ThreadId id, final RpcResponseClosure<AppendEntriesResponse> closure); static boolean stop(final ThreadId id); static boolean join(final ThreadId id); static long getLastRpcSendTimestamp(final ThreadId id); static boolean transferLeadership(final ThreadId id, final long logIndex); static boolean stopTransferLeadership(final ThreadId id); static boolean sendTimeoutNowAndStop(final ThreadId id, final int timeoutMs); static long getNextIndex(final ThreadId id);  }### Answer:
@Test public void testStopTransferLeadership() { testTransferLeadership(); Replicator.stopTransferLeadership(this.id); final Replicator r = getReplicator(); this.id.unlock(); assertEquals(0, r.getTimeoutNowIndex()); assertNull(r.getTimeoutNowInFly()); }