### Question:
IRODSFileSystem { public static IRODSFileSystem instance() throws JargonException { return new IRODSFileSystem(); } IRODSFileSystem();  IRODSFileSystem(final IRODSProtocolManager irodsProtocolManager); static IRODSFileSystem instance(); IRODSAccessObjectFactory getIRODSAccessObjectFactory(); IRODSFileFactory getIRODSFileFactory(final IRODSAccount irodsAccount); void close(); void closeAndEatExceptions(); void close(final IRODSAccount irodsAccount); void closeAndEatExceptions(final IRODSAccount irodsAccount); Map<String, IRODSMidLevelProtocol> getConnectionMap(); IRODSSession getIrodsSession(); IRODSProtocolManager getIrodsProtocolManager(); JargonProperties getJargonProperties();  }### Answer:
@Test public void testInstance() throws Exception { IRODSFileSystem irodsFileSystem = IRODSFileSystem.instance(); Assert.assertNotNull(irodsFileSystem); }