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Current File : /lib/python3/dist-packages/twisted/trial/_dist/test/test_worker.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Test for distributed trial worker side.
"""

import os

from zope.interface.verify import verifyObject

from twisted.trial.reporter import TestResult
from twisted.trial.unittest import TestCase
from twisted.trial._dist.worker import (
    LocalWorker, LocalWorkerAMP, LocalWorkerTransport, WorkerProtocol)
from twisted.trial._dist import managercommands, workercommands

from twisted.scripts import trial
from twisted.test.proto_helpers import StringTransport

from twisted.internet.interfaces import ITransport, IAddress
from twisted.internet.defer import fail, succeed
from twisted.internet.main import CONNECTION_DONE
from twisted.internet.error import ConnectionDone
from twisted.python.reflect import fullyQualifiedName
from twisted.python.failure import Failure
from twisted.protocols.amp import AMP
from twisted.python.compat import NativeStringIO
from io import BytesIO


class FakeAMP(AMP):
    """
    A fake amp protocol.
    """



class WorkerProtocolTests(TestCase):
    """
    Tests for L{WorkerProtocol}.
    """

    def setUp(self):
        """
        Set up a transport, a result stream and a protocol instance.
        """
        self.serverTransport = StringTransport()
        self.clientTransport = StringTransport()
        self.server = WorkerProtocol()
        self.server.makeConnection(self.serverTransport)
        self.client = FakeAMP()
        self.client.makeConnection(self.clientTransport)


    def test_run(self):
        """
        Calling the L{workercommands.Run} command on the client returns a
        response with C{success} sets to C{True}.
        """
        d = self.client.callRemote(workercommands.Run, testCase="doesntexist")

        def check(result):
            self.assertTrue(result['success'])

        d.addCallback(check)
        self.server.dataReceived(self.clientTransport.value())
        self.clientTransport.clear()
        self.client.dataReceived(self.serverTransport.value())
        self.serverTransport.clear()
        return d


    def test_start(self):
        """
        The C{start} command changes the current path.
        """
        curdir = os.path.realpath(os.path.curdir)
        self.addCleanup(os.chdir, curdir)
        self.server.start('..')
        self.assertNotEqual(os.path.realpath(os.path.curdir), curdir)



class LocalWorkerAMPTests(TestCase):
    """
    Test case for distributed trial's manager-side local worker AMP protocol
    """

    def setUp(self):
        self.managerTransport = StringTransport()
        self.managerAMP = LocalWorkerAMP()
        self.managerAMP.makeConnection(self.managerTransport)
        self.result = TestResult()
        self.workerTransport = StringTransport()
        self.worker = AMP()
        self.worker.makeConnection(self.workerTransport)

        config = trial.Options()
        self.testName = "twisted.doesnexist"
        config['tests'].append(self.testName)
        self.testCase = trial._getSuite(config)._tests.pop()

        self.managerAMP.run(self.testCase, self.result)
        self.managerTransport.clear()


    def pumpTransports(self):
        """
        Sends data from C{self.workerTransport} to C{self.managerAMP}, and then
        data from C{self.managerTransport} back to C{self.worker}.
        """
        self.managerAMP.dataReceived(self.workerTransport.value())
        self.workerTransport.clear()
        self.worker.dataReceived(self.managerTransport.value())


    def test_runSuccess(self):
        """
        Run a test, and succeed.
        """
        results = []

        d = self.worker.callRemote(managercommands.AddSuccess,
                                   testName=self.testName)
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertTrue(results)


    def test_runExpectedFailure(self):
        """
        Run a test, and fail expectedly.
        """
        results = []

        d = self.worker.callRemote(managercommands.AddExpectedFailure,
                                   testName=self.testName, error='error',
                                   todo='todoReason')
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual(self.testCase, self.result.expectedFailures[0][0])
        self.assertTrue(results)


    def test_runError(self):
        """
        Run a test, and encounter an error.
        """
        results = []
        errorClass = fullyQualifiedName(ValueError)
        d = self.worker.callRemote(managercommands.AddError,
                                   testName=self.testName, error='error',
                                   errorClass=errorClass,
                                   frames=[])
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual(self.testCase, self.result.errors[0][0])
        self.assertTrue(results)


    def test_runErrorWithFrames(self):
        """
        L{LocalWorkerAMP._buildFailure} recreates the C{Failure.frames} from
        the C{frames} argument passed to C{AddError}.
        """
        results = []
        errorClass = fullyQualifiedName(ValueError)
        d = self.worker.callRemote(managercommands.AddError,
                                   testName=self.testName, error='error',
                                   errorClass=errorClass,
                                   frames=["file.py", "invalid code", "3"])
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual(self.testCase, self.result.errors[0][0])
        self.assertEqual(
            [('file.py', 'invalid code', 3, [], [])],
            self.result.errors[0][1].frames)
        self.assertTrue(results)


    def test_runFailure(self):
        """
        Run a test, and fail.
        """
        results = []
        failClass = fullyQualifiedName(RuntimeError)
        d = self.worker.callRemote(managercommands.AddFailure,
                                   testName=self.testName, fail='fail',
                                   failClass=failClass,
                                   frames=[])
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual(self.testCase, self.result.failures[0][0])
        self.assertTrue(results)


    def test_runSkip(self):
        """
        Run a test, but skip it.
        """
        results = []

        d = self.worker.callRemote(managercommands.AddSkip,
                                   testName=self.testName, reason='reason')
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual(self.testCase, self.result.skips[0][0])
        self.assertTrue(results)


    def test_runUnexpectedSuccesses(self):
        """
        Run a test, and succeed unexpectedly.
        """
        results = []

        d = self.worker.callRemote(managercommands.AddUnexpectedSuccess,
                                   testName=self.testName,
                                   todo='todo')
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual(self.testCase, self.result.unexpectedSuccesses[0][0])
        self.assertTrue(results)


    def test_testWrite(self):
        """
        L{LocalWorkerAMP.testWrite} writes the data received to its test
        stream.
        """
        results = []
        stream = NativeStringIO()
        self.managerAMP.setTestStream(stream)

        command = managercommands.TestWrite
        d = self.worker.callRemote(command,
                                   out="Some output")
        d.addCallback(lambda result: results.append(result['success']))
        self.pumpTransports()

        self.assertEqual("Some output\n", stream.getvalue())
        self.assertTrue(results)


    def test_stopAfterRun(self):
        """
        L{LocalWorkerAMP.run} calls C{stopTest} on its test result once the
        C{Run} commands has succeeded.
        """
        result = object()
        stopped = []

        def fakeCallRemote(command, testCase):
            return succeed(result)

        self.managerAMP.callRemote = fakeCallRemote

        class StopTestResult(TestResult):

            def stopTest(self, test):
                stopped.append(test)


        d = self.managerAMP.run(self.testCase, StopTestResult())
        self.assertEqual([self.testCase], stopped)
        return d.addCallback(self.assertIdentical, result)



class FakeAMProtocol(AMP):
    """
    A fake implementation of L{AMP} for testing.
    """
    id = 0
    dataString = b""

    def dataReceived(self, data):
        self.dataString += data


    def setTestStream(self, stream):
        self.testStream = stream



class FakeTransport(object):
    """
    A fake process transport implementation for testing.
    """
    dataString = b""
    calls = 0

    def writeToChild(self, fd, data):
        self.dataString += data


    def loseConnection(self):
        self.calls += 1



class LocalWorkerTests(TestCase):
    """
    Tests for L{LocalWorker} and L{LocalWorkerTransport}.
    """

    def tidyLocalWorker(self, *args, **kwargs):
        """
        Create a L{LocalWorker}, connect it to a transport, and ensure
        its log files are closed.

        @param args: See L{LocalWorker}

        @param kwargs: See L{LocalWorker}

        @return: a L{LocalWorker} instance
        """
        worker = LocalWorker(*args, **kwargs)
        worker.makeConnection(FakeTransport())
        self.addCleanup(worker._testLog.close)
        self.addCleanup(worker._outLog.close)
        self.addCleanup(worker._errLog.close)
        return worker


    def test_childDataReceived(self):
        """
        L{LocalWorker.childDataReceived} forwards the received data to linked
        L{AMP} protocol if the right file descriptor, otherwise forwards to
        C{ProcessProtocol.childDataReceived}.
        """
        localWorker = self.tidyLocalWorker(FakeAMProtocol(), '.', 'test.log')
        localWorker._outLog = BytesIO()
        localWorker.childDataReceived(4, b"foo")
        localWorker.childDataReceived(1, b"bar")
        self.assertEqual(b"foo", localWorker._ampProtocol.dataString)
        self.assertEqual(b"bar", localWorker._outLog.getvalue())


    def test_outReceived(self):
        """
        L{LocalWorker.outReceived} logs the output into its C{_outLog} log
        file.
        """
        localWorker = self.tidyLocalWorker(FakeAMProtocol(), '.', 'test.log')
        localWorker._outLog = BytesIO()
        data = b"The quick brown fox jumps over the lazy dog"
        localWorker.outReceived(data)
        self.assertEqual(data, localWorker._outLog.getvalue())


    def test_errReceived(self):
        """
        L{LocalWorker.errReceived} logs the errors into its C{_errLog} log
        file.
        """
        localWorker = self.tidyLocalWorker(FakeAMProtocol(), '.', 'test.log')
        localWorker._errLog = BytesIO()
        data = b"The quick brown fox jumps over the lazy dog"
        localWorker.errReceived(data)
        self.assertEqual(data, localWorker._errLog.getvalue())


    def test_write(self):
        """
        L{LocalWorkerTransport.write} forwards the written data to the given
        transport.
        """
        transport = FakeTransport()
        localTransport = LocalWorkerTransport(transport)
        data = b"The quick brown fox jumps over the lazy dog"
        localTransport.write(data)
        self.assertEqual(data, transport.dataString)


    def test_writeSequence(self):
        """
        L{LocalWorkerTransport.writeSequence} forwards the written data to the
        given transport.
        """
        transport = FakeTransport()
        localTransport = LocalWorkerTransport(transport)
        data = (b"The quick ", b"brown fox jumps ", b"over the lazy dog")
        localTransport.writeSequence(data)
        self.assertEqual(b"".join(data), transport.dataString)


    def test_loseConnection(self):
        """
        L{LocalWorkerTransport.loseConnection} forwards the call to the given
        transport.
        """
        transport = FakeTransport()
        localTransport = LocalWorkerTransport(transport)
        localTransport.loseConnection()

        self.assertEqual(transport.calls, 1)


    def test_connectionLost(self):
        """
        L{LocalWorker.connectionLost} closes the log streams.
        """

        localWorker = self.tidyLocalWorker(FakeAMProtocol(), '.', 'test.log')
        localWorker.connectionLost(None)
        self.assertTrue(localWorker._outLog.closed)
        self.assertTrue(localWorker._errLog.closed)
        self.assertTrue(localWorker._testLog.closed)


    def test_processEnded(self):
        """
        L{LocalWorker.processEnded} calls C{connectionLost} on itself and on
        the L{AMP} protocol.
        """

        transport = FakeTransport()
        protocol = FakeAMProtocol()
        localWorker = LocalWorker(protocol, '.', 'test.log')
        localWorker.makeConnection(transport)
        localWorker.processEnded(Failure(CONNECTION_DONE))
        self.assertTrue(localWorker._outLog.closed)
        self.assertTrue(localWorker._errLog.closed)
        self.assertTrue(localWorker._testLog.closed)
        self.assertIdentical(None, protocol.transport)
        return self.assertFailure(localWorker.endDeferred, ConnectionDone)


    def test_addresses(self):
        """
        L{LocalWorkerTransport.getPeer} and L{LocalWorkerTransport.getHost}
        return L{IAddress} objects.
        """
        localTransport = LocalWorkerTransport(None)
        self.assertTrue(verifyObject(IAddress, localTransport.getPeer()))
        self.assertTrue(verifyObject(IAddress, localTransport.getHost()))


    def test_transport(self):
        """
        L{LocalWorkerTransport} implements L{ITransport} to be able to be used
        by L{AMP}.
        """
        localTransport = LocalWorkerTransport(None)
        self.assertTrue(verifyObject(ITransport, localTransport))


    def test_startError(self):
        """
        L{LocalWorker} swallows the exceptions returned by the L{AMP} protocol
        start method, as it generates unnecessary errors.
        """

        def failCallRemote(command, directory):
            return fail(RuntimeError("oops"))

        protocol = FakeAMProtocol()
        protocol.callRemote = failCallRemote
        self.tidyLocalWorker(protocol, '.', 'test.log')

        self.assertEqual([], self.flushLoggedErrors(RuntimeError))

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