### Question:
Controller implements IFloodlightProviderService, 
            IStorageSourceListener { @Override public Map<Long, IOFSwitch> getSwitches() { return Collections.unmodifiableMap(this.activeSwitches); }  void setStorageSourceService(IStorageSourceService storageSource); void setCounterStore(ICounterStoreService counterStore); void setPktInProcessingService(IPktInProcessingTimeService pits); void setRestApiService(IRestApiService restApi); void setThreadPoolService(IThreadPoolService tp); @Override Role getRole(); @Override void setRole(Role role); @Override synchronized void addOFMessageListener(OFType type, 
                                                  IOFMessageListener listener); @Override synchronized void removeOFMessageListener(OFType type,
                                                     IOFMessageListener listener); void removeOFMessageListeners(OFType type); @Override Map<Long, IOFSwitch> getSwitches(); @Override void addOFSwitchListener(IOFSwitchListener listener); @Override void removeOFSwitchListener(IOFSwitchListener listener); @Override Map<OFType, List<IOFMessageListener>> getListeners(); @Override @LogMessageDocs({ @LogMessageDoc(message="Failed to inject OFMessage {message} onto " + "a null switch", explanation="Failed to process a message because the switch " + " is no longer connected."), @LogMessageDoc(level="ERROR", message="Error reinjecting OFMessage on switch {switch}", explanation="An I/O error occured while attempting to " + "process an OpenFlow message", recommendation=LogMessageDoc.CHECK_SWITCH) }) boolean injectOfMessage(IOFSwitch sw, OFMessage msg,
                                   FloodlightContext bc); @Override @LogMessageDoc(message="Calling System.exit", explanation="The controller is terminating") synchronized void terminate(); @Override boolean injectOfMessage(IOFSwitch sw, OFMessage msg); @Override void handleOutgoingMessage(IOFSwitch sw, OFMessage m,
                                      FloodlightContext bc); @Override BasicFactory getOFMessageFactory(); @Override String getControllerId(); @LogMessageDocs({ @LogMessageDoc(message="Listening for switch connections on {address}", explanation="The controller is ready and listening for new" + " switch connections"), @LogMessageDoc(message="Storage exception in controller " + "updates loop; terminating process", explanation=ERROR_DATABASE, recommendation=LogMessageDoc.CHECK_CONTROLLER), @LogMessageDoc(level="ERROR", message="Exception in controller updates loop", explanation="Failed to dispatch controller event", recommendation=LogMessageDoc.GENERIC_ACTION) }) void run(); void setConfigParams(Map<String, String> configParams); void init(Map<String, String> configParams); @LogMessageDoc(message="Waiting for storage source", explanation="The system database is not yet ready", recommendation="If this message persists, this indicates " + "that the system database has failed to start. " + LogMessageDoc.CHECK_CONTROLLER) void startupComponents(); @Override void addInfoProvider(String type, IInfoProvider provider); @Override void removeInfoProvider(String type, IInfoProvider provider); Map<String, Object> getControllerInfo(String type); @Override void addHAListener(IHAListener listener); @Override void removeHAListener(IHAListener listener); @Override Map<String, String> getControllerNodeIPs(); @Override void rowsModified(String tableName, Set<Object> rowKeys); @Override void rowsDeleted(String tableName, Set<Object> rowKeys); @Override long getSystemStartTime(); @Override void setAlwaysClearFlowsOnSwAdd(boolean value); boolean getAlwaysClearFlowsOnSwAdd();  }### Answer:
@Test public void testRemoveActiveSwitch() { IOFSwitch sw = EasyMock.createNiceMock(IOFSwitch.class); boolean exceptionThrown = false; expect(sw.getId()).andReturn(1L).anyTimes(); replay(sw); getController().activeSwitches.put(sw.getId(), sw); try { getController().getSwitches().remove(1L); } catch (UnsupportedOperationException e) { exceptionThrown = true; } assertTrue(exceptionThrown); verify(sw); }