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Dir : ~/lib/python3/dist-packages/twisted/internet/test/

Edit File: test_main.py

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

"""
Tests for L{twisted.internet.main}.
"""

from twisted.internet.error import ReactorAlreadyInstalledError
from twisted.internet.main import installReactor
from twisted.internet.test.modulehelpers import NoReactor
from twisted.trial import unittest

class InstallReactorTests(unittest.SynchronousTestCase):
    """
    Tests for L{installReactor}.
    """

def test_installReactor(self):
        """
        L{installReactor} installs a new reactor if none is present.
        """
        with NoReactor():
            newReactor = object()
            installReactor(newReactor)
            from twisted.internet import reactor

self.assertIs(newReactor, reactor)

def test_alreadyInstalled(self):
        """
        If a reactor is already installed, L{installReactor} raises
        L{ReactorAlreadyInstalledError}.
        """
        with NoReactor():
            installReactor(object())
            self.assertRaises(ReactorAlreadyInstalledError, installReactor, object())

def test_errorIsAnAssertionError(self):
        """
        For backwards compatibility, L{ReactorAlreadyInstalledError} is an
        L{AssertionError}.
        """
        self.assertTrue(issubclass(ReactorAlreadyInstalledError, AssertionError))