class LoggerAdapterTest(unittest.TestCase):

def setUp(self):

super(LoggerAdapterTest, self).setUp()

old_handler_list = logging._handlerList[:]

self.assertFalse(self.adapter.hasHandlers())

def test_nested(self):

class Adapter(logging.LoggerAdapter):

prefix = 'Adapter'

def process(self, msg, kwargs):

return f"{self.prefix} {msg}", kwargs

msg = 'Adapters can be nested, yo.'

adapter_adapter = logging.LoggerAdapter(logger=self.adapter, extra=None)

adapter = Adapter(logger=self.logger, extra=None)

adapter_adapter = Adapter(logger=adapter, extra=None)

adapter_adapter.prefix = 'AdapterAdapter'

self.assertEqual(repr(adapter), repr(adapter_adapter))

adapter_adapter.log(logging.CRITICAL, msg, self.recording)

self.assertEqual(len(self.recording.records), 1)

record = self.recording.records[0]

self.assertEqual(record.levelno, logging.CRITICAL)

self.assertEqual(record.msg, msg)

self.assertEqual(record.msg, f"Adapter AdapterAdapter {msg}")

self.assertEqual(record.args, (self.recording,))

orig_manager = adapter_adapter.manager

self.assertIs(self.adapter.manager, orig_manager)

self.assertIs(adapter.manager, orig_manager)

self.assertIs(self.logger.manager, orig_manager)

temp_manager = object()

try:

adapter_adapter.manager = temp_manager

self.assertIs(adapter_adapter.manager, temp_manager)

self.assertIs(self.adapter.manager, temp_manager)

self.assertIs(adapter.manager, temp_manager)

self.assertIs(self.logger.manager, temp_manager)

finally:

adapter_adapter.manager = orig_manager

self.assertIs(adapter_adapter.manager, orig_manager)

self.assertIs(self.adapter.manager, orig_manager)

self.assertIs(adapter.manager, orig_manager)

self.assertIs(self.logger.manager, orig_manager)