### Question:
NewNodeCatchUpTaskGroup { public boolean remove(NewNodeCatchUpTask task) { return taskMap.remove(task.getNodeId()) != null; }  boolean add(NewNodeCatchUpTask task); boolean onReceiveAppendEntriesResult(AppendEntriesResultMessage resultMessage, int nextLogIndex); boolean onReceiveInstallSnapshotResult(InstallSnapshotResultMessage resultMessage, int nextLogIndex); boolean remove(NewNodeCatchUpTask task);  }### Answer:
@Test public void testRemove() { NewNodeCatchUpTaskGroup group = new NewNodeCatchUpTaskGroup(); NewNodeCatchUpTask task = new NewNodeCatchUpTask( new WaitableNewNodeCatchUpTaskContext(), new NodeEndpoint("D", "localhost", 2336), new NodeConfig() ); group.add(task); Assert.assertTrue(group.remove(task)); }