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Directory : /usr/lib/python3/dist-packages/twisted/application/test/

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Current File : /usr/lib/python3/dist-packages/twisted/application/test//test_service.py

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

"""
Tests for L{twisted.application.service}.
"""

from __future__ import absolute_import, division

from zope.interface import implementer
from zope.interface.exceptions import BrokenImplementation
from zope.interface.verify import verifyObject

from twisted.persisted.sob import IPersistable
from twisted.application.service import Application, IProcess
from twisted.application.service import IService, IServiceCollection
from twisted.application.service import Service
from twisted.trial.unittest import TestCase


@implementer(IService)
class AlmostService(object):
    """
    Implement IService in a way that can fail.

    In general, classes should maintain invariants that adhere
    to the interfaces that they claim to implement --
    otherwise, it is a bug.

    This is a buggy class -- the IService implementation is fragile,
    and several methods will break it. These bugs are intentional,
    as the tests trigger them -- and then check that the class,
    indeed, no longer complies with the interface (IService)
    that it claims to comply with.

    Since the verification will, by definition, only fail on buggy classes --
    in other words, those which do not actually support the interface they
    claim to support, we have to write a buggy class to properly verify
    the interface.
    """

    def __init__(self, name, parent, running):
        self.name = name
        self.parent = parent
        self.running = running


    def makeInvalidByDeletingName(self):
        """
        Probably not a wise method to call.

        This method removes the :code:`name` attribute,
        which has to exist in IService classes.
        """
        del self.name


    def makeInvalidByDeletingParent(self):
        """
        Probably not a wise method to call.

        This method removes the :code:`parent` attribute,
        which has to exist in IService classes.
        """
        del self.parent


    def makeInvalidByDeletingRunning(self):
        """
        Probably not a wise method to call.

        This method removes the :code:`running` attribute,
        which has to exist in IService classes.
        """
        del self.running


    def setName(self, name):
        """
        See L{twisted.application.service.IService}.

        @param name: ignored
        """


    def setServiceParent(self, parent):
        """
        See L{twisted.application.service.IService}.

        @param parent: ignored
        """


    def disownServiceParent(self):
        """
        See L{twisted.application.service.IService}.
        """


    def privilegedStartService(self):
        """
        See L{twisted.application.service.IService}.
        """


    def startService(self):
        """
        See L{twisted.application.service.IService}.
        """


    def stopService(self):
        """
        See L{twisted.application.service.IService}.
        """



class ServiceInterfaceTests(TestCase):
    """
    Tests for L{twisted.application.service.IService} implementation.
    """
    def setUp(self):
        """
        Build something that implements IService.
        """
        self.almostService = AlmostService(parent=None, running=False,
                                           name=None)


    def test_realService(self):
        """
        Service implements IService.
        """
        myService = Service()
        verifyObject(IService, myService)


    def test_hasAll(self):
        """
        AlmostService implements IService.
        """
        verifyObject(IService, self.almostService)


    def test_noName(self):
        """
        AlmostService with no name does not implement IService.
        """
        self.almostService.makeInvalidByDeletingName()
        with self.assertRaises(BrokenImplementation):
            verifyObject(IService, self.almostService)


    def test_noParent(self):
        """
        AlmostService with no parent does not implement IService.
        """
        self.almostService.makeInvalidByDeletingParent()
        with self.assertRaises(BrokenImplementation):
            verifyObject(IService, self.almostService)


    def test_noRunning(self):
        """
        AlmostService with no running does not implement IService.
        """
        self.almostService.makeInvalidByDeletingRunning()
        with self.assertRaises(BrokenImplementation):
            verifyObject(IService, self.almostService)



class ApplicationTests(TestCase):
    """
    Tests for L{twisted.application.service.Application}.
    """
    def test_applicationComponents(self):
        """
        Check L{twisted.application.service.Application} instantiation.
        """
        app = Application('app-name')

        self.assertTrue(verifyObject(IService, IService(app)))
        self.assertTrue(
            verifyObject(IServiceCollection, IServiceCollection(app)))
        self.assertTrue(verifyObject(IProcess, IProcess(app)))
        self.assertTrue(verifyObject(IPersistable, IPersistable(app)))

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