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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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#
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"""
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Tests for L{twisted.trial.util}
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"""
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from __future__ import annotations
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import locale
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import os
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import sys
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from io import StringIO
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from typing import Generator
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from zope.interface import implementer
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from hamcrest import assert_that, equal_to
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from twisted.internet.base import DelayedCall
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from twisted.internet.interfaces import IProcessTransport
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from twisted.python import filepath
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from twisted.python.failure import Failure
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from twisted.trial import util
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from twisted.trial.unittest import SynchronousTestCase
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from twisted.trial.util import (
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DirtyReactorAggregateError,
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_Janitor,
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acquireAttribute,
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excInfoOrFailureToExcInfo,
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openTestLog,
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)
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class MktempTests(SynchronousTestCase):
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"""
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Tests for L{TestCase.mktemp}, a helper function for creating temporary file
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or directory names.
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"""
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def test_name(self) -> None:
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"""
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The path name returned by C{mktemp} is directly beneath a directory
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which identifies the test method which created the name.
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"""
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name = self.mktemp()
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dirs = os.path.dirname(name).split(os.sep)[:-1]
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self.assertEqual(
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dirs, ["twisted.trial.test.test_util", "MktempTests", "test_name"]
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)
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def test_unique(self) -> None:
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"""
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Repeated calls to C{mktemp} return different values.
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"""
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name = self.mktemp()
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self.assertNotEqual(name, self.mktemp())
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def test_created(self) -> None:
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"""
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The directory part of the path name returned by C{mktemp} exists.
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"""
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name = self.mktemp()
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dirname = os.path.dirname(name)
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self.assertTrue(os.path.exists(dirname))
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self.assertFalse(os.path.exists(name))
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def test_location(self) -> None:
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"""
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The path returned by C{mktemp} is beneath the current working directory.
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"""
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path = os.path.abspath(self.mktemp())
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self.assertTrue(path.startswith(os.getcwd()))
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class DirtyReactorAggregateErrorTests(SynchronousTestCase):
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"""
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Tests for the L{DirtyReactorAggregateError}.
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"""
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def test_formatDelayedCall(self) -> None:
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"""
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Delayed calls are formatted nicely.
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"""
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error = DirtyReactorAggregateError(["Foo", "bar"])
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self.assertEqual(
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str(error),
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"""\
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Reactor was unclean.
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DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
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Foo
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bar""",
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)
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def test_formatSelectables(self) -> None:
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"""
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Selectables are formatted nicely.
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"""
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error = DirtyReactorAggregateError([], ["selectable 1", "selectable 2"])
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self.assertEqual(
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str(error),
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"""\
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Reactor was unclean.
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Selectables:
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selectable 1
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selectable 2""",
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)
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def test_formatDelayedCallsAndSelectables(self) -> None:
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"""
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Both delayed calls and selectables can appear in the same error.
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"""
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error = DirtyReactorAggregateError(["bleck", "Boozo"], ["Sel1", "Sel2"])
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self.assertEqual(
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str(error),
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"""\
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Reactor was unclean.
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DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
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bleck
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Boozo
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Selectables:
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Sel1
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Sel2""",
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)
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class StubReactor:
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"""
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A reactor stub which contains enough functionality to be used with the
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L{_Janitor}.
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@ivar iterations: A list of the arguments passed to L{iterate}.
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@ivar removeAllCalled: Number of times that L{removeAll} was called.
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@ivar selectables: The value that will be returned from L{removeAll}.
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@ivar delayedCalls: The value to return from L{getDelayedCalls}.
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"""
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def __init__(
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self, delayedCalls: list[DelayedCall], selectables: list[object] | None = None
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) -> None:
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"""
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@param delayedCalls: See L{StubReactor.delayedCalls}.
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@param selectables: See L{StubReactor.selectables}.
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"""
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self.delayedCalls = delayedCalls
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self.iterations: list[float | None] = []
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self.removeAllCalled = 0
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if not selectables:
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selectables = []
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self.selectables = selectables
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def iterate(self, timeout: float | None = None) -> None:
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"""
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Increment C{self.iterations}.
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"""
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self.iterations.append(timeout)
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def getDelayedCalls(self) -> list[DelayedCall]:
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"""
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Return C{self.delayedCalls}.
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"""
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return self.delayedCalls
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def removeAll(self) -> list[object]:
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"""
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Increment C{self.removeAllCalled} and return C{self.selectables}.
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"""
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self.removeAllCalled += 1
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return self.selectables
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class StubErrorReporter:
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"""
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A subset of L{twisted.trial.itrial.IReporter} which records L{addError}
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calls.
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@ivar errors: List of two-tuples of (test, error) which were passed to
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L{addError}.
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"""
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def __init__(self) -> None:
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self.errors: list[tuple[object, Failure]] = []
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def addError(self, test: object, error: Failure) -> None:
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"""
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Record parameters in C{self.errors}.
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"""
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self.errors.append((test, error))
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class JanitorTests(SynchronousTestCase):
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"""
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Tests for L{_Janitor}!
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"""
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def test_cleanPendingSpinsReactor(self) -> None:
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"""
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During pending-call cleanup, the reactor will be spun twice with an
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instant timeout. This is not a requirement, it is only a test for
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current behavior. Hopefully Trial will eventually not do this kind of
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reactor stuff.
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"""
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reactor = StubReactor([])
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jan = _Janitor(None, None, reactor=reactor)
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jan._cleanPending()
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self.assertEqual(reactor.iterations, [0, 0])
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def test_cleanPendingCancelsCalls(self) -> None:
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"""
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During pending-call cleanup, the janitor cancels pending timed calls.
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"""
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def func() -> str:
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return "Lulz"
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cancelled: list[DelayedCall] = []
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delayedCall = DelayedCall(300, func, (), {}, cancelled.append, lambda x: None)
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reactor = StubReactor([delayedCall])
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jan = _Janitor(None, None, reactor=reactor)
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jan._cleanPending()
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self.assertEqual(cancelled, [delayedCall])
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def test_cleanPendingReturnsDelayedCallStrings(self) -> None:
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"""
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The Janitor produces string representations of delayed calls from the
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delayed call cleanup method. It gets the string representations
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*before* cancelling the calls; this is important because cancelling the
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call removes critical debugging information from the string
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representation.
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"""
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delayedCall = DelayedCall(
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300, lambda: None, (), {}, lambda x: None, lambda x: None, seconds=lambda: 0
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)
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delayedCallString = str(delayedCall)
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reactor = StubReactor([delayedCall])
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jan = _Janitor(None, None, reactor=reactor)
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strings = jan._cleanPending()
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self.assertEqual(strings, [delayedCallString])
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def test_cleanReactorRemovesSelectables(self) -> None:
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"""
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The Janitor will remove selectables during reactor cleanup.
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"""
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reactor = StubReactor([])
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jan = _Janitor(None, None, reactor=reactor)
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jan._cleanReactor()
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self.assertEqual(reactor.removeAllCalled, 1)
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def test_cleanReactorKillsProcesses(self) -> None:
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"""
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The Janitor will kill processes during reactor cleanup.
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"""
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@implementer(IProcessTransport)
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class StubProcessTransport: # type: ignore[misc]
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"""
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A stub L{IProcessTransport} provider which records signals.
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@ivar signals: The signals passed to L{signalProcess}.
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"""
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def __init__(self) -> None:
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self.signals: list[str | int] = []
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def signalProcess(self, signal: str | int) -> None:
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"""
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Append C{signal} to C{self.signals}.
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"""
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self.signals.append(signal)
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pt = StubProcessTransport()
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reactor = StubReactor([], [pt])
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jan = _Janitor(None, None, reactor=reactor)
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jan._cleanReactor()
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self.assertEqual(pt.signals, ["KILL"])
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def test_cleanReactorReturnsSelectableStrings(self) -> None:
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"""
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The Janitor returns string representations of the selectables that it
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cleaned up from the reactor cleanup method.
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"""
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class Selectable:
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"""
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A stub Selectable which only has an interesting string
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representation.
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"""
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def __repr__(self) -> str:
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return "(SELECTABLE!)"
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reactor = StubReactor([], [Selectable()])
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jan = _Janitor(None, None, reactor=reactor)
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self.assertEqual(jan._cleanReactor(), ["(SELECTABLE!)"])
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def test_postCaseCleanupNoErrors(self) -> None:
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"""
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The post-case cleanup method will return True and not call C{addError}
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on the result if there are no pending calls.
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"""
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reactor = StubReactor([])
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test = object()
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reporter = StubErrorReporter()
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jan = _Janitor(test, reporter, reactor=reactor)
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self.assertTrue(jan.postCaseCleanup())
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self.assertEqual(reporter.errors, [])
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def test_postCaseCleanupWithErrors(self) -> None:
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"""
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The post-case cleanup method will return False and call C{addError} on
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the result with a L{DirtyReactorAggregateError} Failure if there are
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pending calls.
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"""
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delayedCall = DelayedCall(
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300, lambda: None, (), {}, lambda x: None, lambda x: None, seconds=lambda: 0
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)
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delayedCallString = str(delayedCall)
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reactor = StubReactor([delayedCall], [])
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test = object()
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reporter = StubErrorReporter()
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jan = _Janitor(test, reporter, reactor=reactor)
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self.assertFalse(jan.postCaseCleanup())
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self.assertEqual(len(reporter.errors), 1)
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self.assertEqual(reporter.errors[0][1].value.delayedCalls, [delayedCallString])
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def test_postClassCleanupNoErrors(self) -> None:
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"""
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The post-class cleanup method will not call C{addError} on the result
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if there are no pending calls or selectables.
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"""
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reactor = StubReactor([])
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test = object()
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reporter = StubErrorReporter()
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jan = _Janitor(test, reporter, reactor=reactor)
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jan.postClassCleanup()
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self.assertEqual(reporter.errors, [])
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def test_postClassCleanupWithPendingCallErrors(self) -> None:
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"""
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The post-class cleanup method call C{addError} on the result with a
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L{DirtyReactorAggregateError} Failure if there are pending calls.
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"""
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delayedCall = DelayedCall(
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300, lambda: None, (), {}, lambda x: None, lambda x: None, seconds=lambda: 0
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)
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delayedCallString = str(delayedCall)
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reactor = StubReactor([delayedCall], [])
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test = object()
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reporter = StubErrorReporter()
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jan = _Janitor(test, reporter, reactor=reactor)
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jan.postClassCleanup()
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self.assertEqual(len(reporter.errors), 1)
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self.assertEqual(reporter.errors[0][1].value.delayedCalls, [delayedCallString])
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def test_postClassCleanupWithSelectableErrors(self) -> None:
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"""
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The post-class cleanup method call C{addError} on the result with a
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L{DirtyReactorAggregateError} Failure if there are selectables.
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"""
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selectable = "SELECTABLE HERE"
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reactor = StubReactor([], [selectable])
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test = object()
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reporter = StubErrorReporter()
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jan = _Janitor(test, reporter, reactor=reactor)
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jan.postClassCleanup()
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self.assertEqual(len(reporter.errors), 1)
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self.assertEqual(reporter.errors[0][1].value.selectables, [repr(selectable)])
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class RemoveSafelyTests(SynchronousTestCase):
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"""
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Tests for L{util._removeSafely}.
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"""
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def test_removeSafelyNoTrialMarker(self) -> None:
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"""
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If a path doesn't contain a node named C{"_trial_marker"}, that path is
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not removed by L{util._removeSafely} and a L{util._NoTrialMarker}
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exception is raised instead.
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"""
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directory = self.mktemp().encode("utf-8")
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os.mkdir(directory)
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dirPath = filepath.FilePath(directory)
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self.assertRaises(util._NoTrialMarker, util._removeSafely, dirPath)
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def test_removeSafelyRemoveFailsMoveSucceeds(self) -> None:
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"""
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If an L{OSError} is raised while removing a path in
|
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L{util._removeSafely}, an attempt is made to move the path to a new
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name.
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"""
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def dummyRemove() -> None:
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"""
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Raise an C{OSError} to emulate the branch of L{util._removeSafely}
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in which path removal fails.
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"""
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raise OSError()
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# Patch stdout so we can check the print statements in _removeSafely
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out = StringIO()
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self.patch(sys, "stdout", out)
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# Set up a trial directory with a _trial_marker
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directory = self.mktemp().encode("utf-8")
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os.mkdir(directory)
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dirPath = filepath.FilePath(directory)
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dirPath.child(b"_trial_marker").touch()
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# Ensure that path.remove() raises an OSError
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dirPath.remove = dummyRemove # type: ignore[method-assign]
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util._removeSafely(dirPath)
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self.assertIn("could not remove FilePath", out.getvalue())
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def test_removeSafelyRemoveFailsMoveFails(self) -> None:
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"""
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If an L{OSError} is raised while removing a path in
|
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L{util._removeSafely}, an attempt is made to move the path to a new
|
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name. If that attempt fails, the L{OSError} is re-raised.
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"""
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||||
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def dummyRemove() -> None:
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"""
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Raise an C{OSError} to emulate the branch of L{util._removeSafely}
|
||||
in which path removal fails.
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||||
"""
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raise OSError("path removal failed")
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def dummyMoveTo(destination: object, followLinks: bool = True) -> None:
|
||||
"""
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Raise an C{OSError} to emulate the branch of L{util._removeSafely}
|
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in which path movement fails.
|
||||
"""
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raise OSError("path movement failed")
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# Patch stdout so we can check the print statements in _removeSafely
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out = StringIO()
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self.patch(sys, "stdout", out)
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# Set up a trial directory with a _trial_marker
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directory = self.mktemp().encode("utf-8")
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os.mkdir(directory)
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dirPath = filepath.FilePath(directory)
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dirPath.child(b"_trial_marker").touch()
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# Ensure that path.remove() and path.moveTo() both raise OSErrors
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dirPath.remove = dummyRemove # type: ignore[method-assign]
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dirPath.moveTo = dummyMoveTo # type: ignore[method-assign]
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error = self.assertRaises(OSError, util._removeSafely, dirPath)
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self.assertEqual(str(error), "path movement failed")
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self.assertIn("could not remove FilePath", out.getvalue())
|
||||
|
||||
|
||||
class ExcInfoTests(SynchronousTestCase):
|
||||
"""
|
||||
Tests for L{excInfoOrFailureToExcInfo}.
|
||||
"""
|
||||
|
||||
def test_excInfo(self) -> None:
|
||||
"""
|
||||
L{excInfoOrFailureToExcInfo} returns exactly what it is passed, if it is
|
||||
passed a tuple like the one returned by L{sys.exc_info}.
|
||||
"""
|
||||
info = (ValueError, ValueError("foo"), None)
|
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self.assertTrue(info is excInfoOrFailureToExcInfo(info))
|
||||
|
||||
def test_failure(self) -> None:
|
||||
"""
|
||||
When called with a L{Failure} instance, L{excInfoOrFailureToExcInfo}
|
||||
returns a tuple like the one returned by L{sys.exc_info}, with the
|
||||
elements taken from the type, value, and traceback of the failure.
|
||||
"""
|
||||
try:
|
||||
1 / 0
|
||||
except BaseException:
|
||||
f = Failure()
|
||||
self.assertEqual((f.type, f.value, f.tb), excInfoOrFailureToExcInfo(f))
|
||||
|
||||
|
||||
class AcquireAttributeTests(SynchronousTestCase):
|
||||
"""
|
||||
Tests for L{acquireAttribute}.
|
||||
"""
|
||||
|
||||
def test_foundOnEarlierObject(self) -> None:
|
||||
"""
|
||||
The value returned by L{acquireAttribute} is the value of the requested
|
||||
attribute on the first object in the list passed in which has that
|
||||
attribute.
|
||||
"""
|
||||
self.value = value = object()
|
||||
self.assertTrue(value is acquireAttribute([self, object()], "value"))
|
||||
|
||||
def test_foundOnLaterObject(self) -> None:
|
||||
"""
|
||||
The same as L{test_foundOnEarlierObject}, but for the case where the 2nd
|
||||
element in the object list has the attribute and the first does not.
|
||||
"""
|
||||
self.value = value = object()
|
||||
self.assertTrue(value is acquireAttribute([object(), self], "value"))
|
||||
|
||||
def test_notFoundException(self) -> None:
|
||||
"""
|
||||
If none of the objects passed in the list to L{acquireAttribute} have
|
||||
the requested attribute, L{AttributeError} is raised.
|
||||
"""
|
||||
self.assertRaises(AttributeError, acquireAttribute, [object()], "foo")
|
||||
|
||||
def test_notFoundDefault(self) -> None:
|
||||
"""
|
||||
If none of the objects passed in the list to L{acquireAttribute} have
|
||||
the requested attribute and a default value is given, the default value
|
||||
is returned.
|
||||
"""
|
||||
default = object()
|
||||
self.assertTrue(default is acquireAttribute([object()], "foo", default))
|
||||
|
||||
|
||||
class ListToPhraseTests(SynchronousTestCase):
|
||||
"""
|
||||
Input is transformed into a string representation of the list,
|
||||
with each item separated by delimiter (defaulting to a comma) and the final
|
||||
two being separated by a final delimiter.
|
||||
"""
|
||||
|
||||
def test_empty(self) -> None:
|
||||
"""
|
||||
If things is empty, an empty string is returned.
|
||||
"""
|
||||
sample: list[None] = []
|
||||
expected = ""
|
||||
result = util._listToPhrase(sample, "and")
|
||||
self.assertEqual(expected, result)
|
||||
|
||||
def test_oneWord(self) -> None:
|
||||
"""
|
||||
With a single item, the item is returned.
|
||||
"""
|
||||
sample = ["One"]
|
||||
expected = "One"
|
||||
result = util._listToPhrase(sample, "and")
|
||||
self.assertEqual(expected, result)
|
||||
|
||||
def test_twoWords(self) -> None:
|
||||
"""
|
||||
Two words are separated by the final delimiter.
|
||||
"""
|
||||
sample = ["One", "Two"]
|
||||
expected = "One and Two"
|
||||
result = util._listToPhrase(sample, "and")
|
||||
self.assertEqual(expected, result)
|
||||
|
||||
def test_threeWords(self) -> None:
|
||||
"""
|
||||
With more than two words, the first two are separated by the delimiter.
|
||||
"""
|
||||
sample = ["One", "Two", "Three"]
|
||||
expected = "One, Two, and Three"
|
||||
result = util._listToPhrase(sample, "and")
|
||||
self.assertEqual(expected, result)
|
||||
|
||||
def test_fourWords(self) -> None:
|
||||
"""
|
||||
If a delimiter is specified, it is used instead of the default comma.
|
||||
"""
|
||||
sample = ["One", "Two", "Three", "Four"]
|
||||
expected = "One; Two; Three; or Four"
|
||||
result = util._listToPhrase(sample, "or", delimiter="; ")
|
||||
self.assertEqual(expected, result)
|
||||
|
||||
def test_notString(self) -> None:
|
||||
"""
|
||||
If something in things is not a string, it is converted into one.
|
||||
"""
|
||||
sample = [1, 2, "three"]
|
||||
expected = "1, 2, and three"
|
||||
result = util._listToPhrase(sample, "and")
|
||||
self.assertEqual(expected, result)
|
||||
|
||||
def test_stringTypeError(self) -> None:
|
||||
"""
|
||||
If things is a string, a TypeError is raised.
|
||||
"""
|
||||
sample = "One, two, three"
|
||||
error = self.assertRaises(TypeError, util._listToPhrase, sample, "and")
|
||||
self.assertEqual(str(error), "Things must be a list or a tuple")
|
||||
|
||||
def test_iteratorTypeError(self) -> None:
|
||||
"""
|
||||
If things is an iterator, a TypeError is raised.
|
||||
"""
|
||||
sample = iter([1, 2, 3])
|
||||
error = self.assertRaises(TypeError, util._listToPhrase, sample, "and")
|
||||
self.assertEqual(str(error), "Things must be a list or a tuple")
|
||||
|
||||
def test_generatorTypeError(self) -> None:
|
||||
"""
|
||||
If things is a generator, a TypeError is raised.
|
||||
"""
|
||||
|
||||
def sample() -> Generator[int, None, None]:
|
||||
yield from range(2)
|
||||
|
||||
error = self.assertRaises(TypeError, util._listToPhrase, sample, "and")
|
||||
self.assertEqual(str(error), "Things must be a list or a tuple")
|
||||
|
||||
|
||||
class OpenTestLogTests(SynchronousTestCase):
|
||||
"""
|
||||
Tests for C{openTestLog}.
|
||||
"""
|
||||
|
||||
def test_utf8(self) -> None:
|
||||
"""
|
||||
The log file is opened in text mode and uses UTF-8 for encoding.
|
||||
"""
|
||||
# Modern OSes are running default locale in UTF-8 and this is what is
|
||||
# used by Python at startup. For this test, we force an ASCII default
|
||||
# encoding so that we can see that UTF-8 is used even if it isn't the
|
||||
# platform default.
|
||||
currentLocale = locale.getlocale()
|
||||
self.addCleanup(locale.setlocale, locale.LC_ALL, currentLocale)
|
||||
locale.setlocale(locale.LC_ALL, ("C", "ascii"))
|
||||
|
||||
text = "Here comes the \N{SUN}"
|
||||
p = filepath.FilePath(self.mktemp())
|
||||
with openTestLog(p) as f:
|
||||
f.write(text)
|
||||
|
||||
with open(p.path, "rb") as f:
|
||||
written = f.read()
|
||||
|
||||
assert_that(text.encode("utf-8"), equal_to(written))
|
||||
|
||||
def test_append(self) -> None:
|
||||
"""
|
||||
The log file is opened in append mode so if runner configuration specifies
|
||||
an existing log file its contents are not wiped out.
|
||||
"""
|
||||
existingText = "Hello, world.\n "
|
||||
newText = "Goodbye, world.\n"
|
||||
expected = f"Hello, world.{os.linesep} Goodbye, world.{os.linesep}"
|
||||
p = filepath.FilePath(self.mktemp())
|
||||
with openTestLog(p) as f:
|
||||
f.write(existingText)
|
||||
with openTestLog(p) as f:
|
||||
f.write(newText)
|
||||
|
||||
assert_that(
|
||||
p.getContent().decode("utf-8"),
|
||||
equal_to(expected),
|
||||
)
|
||||
Reference in New Issue
Block a user