### Question:
NodeImpl implements Node { @Subscribe public void onReceiveRequestVoteResult(RequestVoteResult result) { context.taskExecutor().submit(() -> doProcessRequestVoteResult(result), LOGGING_FUTURE_CALLBACK); } NodeImpl(NodeContext context); @Override synchronized void registerStateMachine(@Nonnull StateMachine stateMachine); @Override @Nonnull RoleNameAndLeaderId getRoleNameAndLeaderId(); @Override void addNodeRoleListener(@Nonnull NodeRoleListener listener); @Override synchronized void start(); @Override void appendLog(@Nonnull byte[] commandBytes); @Override @Nonnull GroupConfigChangeTaskReference addNode(@Nonnull NodeEndpoint endpoint); @Override @Nonnull GroupConfigChangeTaskReference removeNode(@Nonnull NodeId id); @Subscribe void onReceiveRequestVoteRpc(RequestVoteRpcMessage rpcMessage); @Subscribe void onReceiveRequestVoteResult(RequestVoteResult result); @Subscribe void onReceiveAppendEntriesRpc(AppendEntriesRpcMessage rpcMessage); @Subscribe void onReceiveAppendEntriesResult(AppendEntriesResultMessage resultMessage); @Subscribe void onReceiveInstallSnapshotRpc(InstallSnapshotRpcMessage rpcMessage); @Subscribe void onReceiveInstallSnapshotResult(InstallSnapshotResultMessage resultMessage); @Subscribe void onGroupConfigEntryFromLeaderAppend(GroupConfigEntryFromLeaderAppendEvent event); @Subscribe void onGroupConfigEntryCommitted(GroupConfigEntryCommittedEvent event); @Subscribe void onGroupConfigEntryBatchRemoved(GroupConfigEntryBatchRemovedEvent event); @Subscribe void onGenerateSnapshot(SnapshotGenerateEvent event); @Subscribe void onReceiveDeadEvent(DeadEvent deadEvent); @Override synchronized void stop();  }### Answer:
@Test public void testOnReceiveRequestVoteResult() { NodeImpl node = (NodeImpl) newNodeBuilder( NodeId.of("A"), new NodeEndpoint("A", "localhost", 2333), new NodeEndpoint("B", "localhost", 2334), new NodeEndpoint("C", "localhost", 2335) ).build(); node.start(); node.electionTimeout(); node.onReceiveRequestVoteResult(new RequestVoteResult(1, true)); RoleState state = node.getRoleState(); Assert.assertEquals(RoleName.LEADER, state.getRoleName()); Assert.assertEquals(1, state.getTerm()); Assert.assertTrue(node.getContext().group().findMember(NodeId.of("B")).isReplicationStateSet()); Assert.assertTrue(node.getContext().group().findMember(NodeId.of("C")).isReplicationStateSet()); EntryMeta lastEntryMeta = node.getContext().log().getLastEntryMeta(); Assert.assertEquals(Entry.KIND_NO_OP, lastEntryMeta.getKind()); Assert.assertEquals(1, lastEntryMeta.getIndex()); Assert.assertEquals(1, lastEntryMeta.getTerm()); }