62 lines
1.6 KiB
Python
62 lines
1.6 KiB
Python
# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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Test cases for L{twisted.logger._buffer}.
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"""
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from zope.interface.verify import verifyObject, BrokenMethodImplementation
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from twisted.trial import unittest
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from .._observer import ILogObserver
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from .._buffer import LimitedHistoryLogObserver
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class LimitedHistoryLogObserverTests(unittest.TestCase):
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"""
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Tests for L{LimitedHistoryLogObserver}.
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"""
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def test_interface(self):
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"""
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L{LimitedHistoryLogObserver} provides L{ILogObserver}.
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"""
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observer = LimitedHistoryLogObserver(0)
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try:
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verifyObject(ILogObserver, observer)
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except BrokenMethodImplementation as e:
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self.fail(e)
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def test_order(self):
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"""
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L{LimitedHistoryLogObserver} saves history in the order it is received.
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"""
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size = 4
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events = [dict(n=n) for n in range(size//2)]
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observer = LimitedHistoryLogObserver(size)
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for event in events:
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observer(event)
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outEvents = []
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observer.replayTo(outEvents.append)
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self.assertEqual(events, outEvents)
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def test_limit(self):
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"""
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When more events than a L{LimitedHistoryLogObserver}'s maximum size are
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buffered, older events will be dropped.
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"""
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size = 4
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events = [dict(n=n) for n in range(size*2)]
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observer = LimitedHistoryLogObserver(size)
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for event in events:
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observer(event)
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outEvents = []
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observer.replayTo(outEvents.append)
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self.assertEqual(events[-size:], outEvents)
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