### Question:
VehicleAssignmentServiceImpl implements VehicleAssignmentService { @Override public ArrayList<AgencyAndId> getAssignedVehicleIdsForDepot( String depotId) throws Exception { ArrayList<AgencyAndId> list = _depotToVehicleIdListMap.get(depotId); if (list == null) { list = getVehicleListForDepot(depotId); if (list == null) { throw new Exception( "Vehicle assignment service is temporarily unavailable."); } synchronized(this){ updateVehicleIdToDepotMap(_depotToVehicleIdListMap.get(depotId), list, depotId); _depotToVehicleIdListMap.put(depotId, list); } } if (_depotToVehicleIdListMap.size() == 0) { _log.warn("No depot/vehicle assignment values are present!"); } else { _log.debug("Have " + _depotToVehicleIdListMap.size() + " depot/vehicle assignments."); } return list; }  @Autowired void setConfigurationService(ConfigurationService configurationService); void setTransitDataManagerApiLibrary(
      TransitDataManagerApiLibrary apiLibrary); synchronized void refreshData(); @PreDestroy void destroy(); @Override ArrayList<AgencyAndId> getAssignedVehicleIdsForDepot(
      String depotId); @Override String getAssignedDepotForVehicleId(AgencyAndId vehicle);  }### Answer:
@Test public void testGetAssignedVehicleIdsForDepot() throws Exception { ArrayList<AgencyAndId> vehicles = service.getAssignedVehicleIdsForDepot("JG"); assertEquals(1, vehicles.size()); AgencyAndId agencyAndId = vehicles.get(0); String agencyId = agencyAndId.getAgencyId(); String vehicleId = agencyAndId.getId(); assertEquals("MTA", agencyId); assertEquals("45", vehicleId); }