### Question:
Listener4Assist implements ListenerAssist { @Override public void setAlwaysRecoverAssistModelIfNotSet(boolean isAlwaysRecoverAssistModel) { modelHandler.setAlwaysRecoverAssistModelIfNotSet(isAlwaysRecoverAssistModel); } Listener4Assist(ListenerModelHandler<T> handler);  Listener4Assist(ListenerModelHandler.ModelCreator<T> creator); void setCallback(@NonNull Listener4Callback callback); void setAssistExtend(@NonNull AssistExtend assistExtend); AssistExtend getAssistExtend(); void infoReady(DownloadTask task, BreakpointInfo info, boolean fromBreakpoint); void fetchProgress(DownloadTask task, int blockIndex, long increaseBytes); void fetchEnd(DownloadTask task, int blockIndex); synchronized void taskEnd(DownloadTask task, EndCause cause,
                                     @Nullable Exception realCause); @Override boolean isAlwaysRecoverAssistModel(); @Override void setAlwaysRecoverAssistModel(boolean isAlwaysRecoverAssistModel); @Override void setAlwaysRecoverAssistModelIfNotSet(boolean isAlwaysRecoverAssistModel);  }### Answer:
@Test public void setAlwaysRecoverAssistModelIfNotSet() { assist.setAlwaysRecoverAssistModelIfNotSet(true); verify(handler).setAlwaysRecoverAssistModelIfNotSet(eq(true)); assist.setAlwaysRecoverAssistModelIfNotSet(false); verify(handler).setAlwaysRecoverAssistModelIfNotSet(eq(false)); }