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515fce4fc4
Import logging lazily in assertLogs() in unittest. Move TestHandler from test.support to logging_helper.
69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
import logging
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import collections
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from .case import _BaseTestCaseContext
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_LoggingWatcher = collections.namedtuple("_LoggingWatcher",
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["records", "output"])
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class _CapturingHandler(logging.Handler):
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"""
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A logging handler capturing all (raw and formatted) logging output.
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"""
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def __init__(self):
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logging.Handler.__init__(self)
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self.watcher = _LoggingWatcher([], [])
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def flush(self):
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pass
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def emit(self, record):
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self.watcher.records.append(record)
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msg = self.format(record)
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self.watcher.output.append(msg)
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class _AssertLogsContext(_BaseTestCaseContext):
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"""A context manager used to implement TestCase.assertLogs()."""
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LOGGING_FORMAT = "%(levelname)s:%(name)s:%(message)s"
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def __init__(self, test_case, logger_name, level):
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_BaseTestCaseContext.__init__(self, test_case)
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self.logger_name = logger_name
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if level:
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self.level = logging._nameToLevel.get(level, level)
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else:
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self.level = logging.INFO
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self.msg = None
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def __enter__(self):
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if isinstance(self.logger_name, logging.Logger):
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logger = self.logger = self.logger_name
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else:
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logger = self.logger = logging.getLogger(self.logger_name)
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formatter = logging.Formatter(self.LOGGING_FORMAT)
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handler = _CapturingHandler()
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handler.setFormatter(formatter)
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self.watcher = handler.watcher
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self.old_handlers = logger.handlers[:]
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self.old_level = logger.level
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self.old_propagate = logger.propagate
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logger.handlers = [handler]
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logger.setLevel(self.level)
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logger.propagate = False
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return handler.watcher
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def __exit__(self, exc_type, exc_value, tb):
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self.logger.handlers = self.old_handlers
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self.logger.propagate = self.old_propagate
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self.logger.setLevel(self.old_level)
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if exc_type is not None:
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# let unexpected exceptions pass through
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return False
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if len(self.watcher.records) == 0:
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self._raiseFailure(
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"no logs of level {} or higher triggered on {}"
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.format(logging.getLevelName(self.level), self.logger.name))
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