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# 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)