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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Test cases for L{twisted.logger._buffer}.
"""

from zope.interface.verify import verifyObject, BrokenMethodImplementation

from twisted.trial import unittest

from .._observer import ILogObserver
from .._buffer import LimitedHistoryLogObserver



class LimitedHistoryLogObserverTests(unittest.TestCase):
    """
    Tests for L{LimitedHistoryLogObserver}.
    """

    def test_interface(self):
        """
        L{LimitedHistoryLogObserver} provides L{ILogObserver}.
        """
        observer = LimitedHistoryLogObserver(0)
        try:
            verifyObject(ILogObserver, observer)
        except BrokenMethodImplementation as e:
            self.fail(e)


    def test_order(self):
        """
        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 = []
        observer.replayTo(outEvents.append)
        self.assertEqual(events, outEvents)


    def test_limit(self):
        """
        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 = []
        observer.replayTo(outEvents.append)
        self.assertEqual(events[-size:], outEvents)

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
__init__.py File 161 B 0644
test_buffer.py File 1.6 KB 0644
test_file.py File 5.49 KB 0644
test_filter.py File 11.73 KB 0644
test_flatten.py File 8.92 KB 0644
test_format.py File 12.37 KB 0644
test_global.py File 11.23 KB 0644
test_io.py File 7.04 KB 0644
test_json.py File 18.15 KB 0644
test_legacy.py File 14.06 KB 0644
test_levels.py File 875 B 0644
test_logger.py File 7.18 KB 0644
test_observer.py File 5.13 KB 0644
test_stdlib.py File 8.44 KB 0644
test_util.py File 2.61 KB 0644