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usr/lib/python3/dist-packages/twisted/logger/test/test_buffer.py 0000644 00000003433 15030023332 0021043 0 ustar 00 # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Test cases for L{twisted.logger._buffer}. """ from typing import List, cast from zope.interface.exceptions import BrokenMethodImplementation from zope.interface.verify import verifyObject from twisted.trial import unittest from .._buffer import LimitedHistoryLogObserver from .._interfaces import ILogObserver, LogEvent class LimitedHistoryLogObserverTests(unittest.TestCase): """ Tests for L{LimitedHistoryLogObserver}. """ def test_interface(self) -> None: """ L{LimitedHistoryLogObserver} provides L{ILogObserver}. """ observer = LimitedHistoryLogObserver(0) try: verifyObject(ILogObserver, observer) except BrokenMethodImplementation as e: self.fail(e) def test_order(self) -> None: """ L{LimitedHistoryLogObserver} saves history in the order it is received. """ size = 4 events = [dict(n=n) for n in range(size // 2)] observer = LimitedHistoryLogObserver(size) for event in events: observer(event) outEvents: List[LogEvent] = [] observer.replayTo(cast(ILogObserver, outEvents.append)) self.assertEqual(events, outEvents) def test_limit(self) -> None: """ When more events than a L{LimitedHistoryLogObserver}'s maximum size are buffered, older events will be dropped. """ size = 4 events = [dict(n=n) for n in range(size * 2)] observer = LimitedHistoryLogObserver(size) for event in events: observer(event) outEvents: List[LogEvent] = [] observer.replayTo(cast(ILogObserver, outEvents.append)) self.assertEqual(events[-size:], outEvents)
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