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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test cases for convenience functionality in L{twisted._threads._convenience}.
"""
from __future__ import absolute_import, division, print_function
from twisted.trial.unittest import SynchronousTestCase
from .._convenience import Quit
from .._ithreads import AlreadyQuit
class QuitTests(SynchronousTestCase):
"""
Tests for L{Quit}
"""
def test_isInitiallySet(self):
"""
L{Quit.isSet} starts as L{False}.
"""
quit = Quit()
self.assertEqual(quit.isSet, False)
def test_setSetsSet(self):
"""
L{Quit.set} sets L{Quit.isSet} to L{True}.
"""
quit = Quit()
quit.set()
self.assertEqual(quit.isSet, True)
def test_checkDoesNothing(self):
"""
L{Quit.check} initially does nothing and returns L{None}.
"""
quit = Quit()
self.assertIs(quit.check(), None)
def test_checkAfterSetRaises(self):
"""
L{Quit.check} raises L{AlreadyQuit} if L{Quit.set} has been called.
"""
quit = Quit()
quit.set()
self.assertRaises(AlreadyQuit, quit.check)
def test_setTwiceRaises(self):
"""
L{Quit.set} raises L{AlreadyQuit} if it has been called previously.
"""
quit = Quit()
quit.set()
self.assertRaises(AlreadyQuit, quit.set)
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