# Copyright 2011 Isotoma Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from twisted.trial.unittest import TestCase
from twisted.internet import defer

from yaybu.boiler.task import SerialTask


class _TestTask(object):
    def __init__(self, work, *args, **kwargs):
        self.work = work
        self.args = args
        self.kwargs = kwargs

        self.deferred = defer.Deferred()

    def whenDone(self):
        return self.deferred

    def start(self):
        self.work(*self.args, **self.kwargs)
        self.deferred.callback(True)


class TestSerialTask(TestCase):

    @defer.inlineCallbacks
    def test_execute(self):
        output = []

        s = SerialTask()
        s.add(_TestTask(output.append, 1))
        s.add(_TestTask(output.append, 2))
        s.add(_TestTask(output.append, 3))
        s.start()

        yield s.whenDone()

        self.failUnlessEqual(output, [1,2,3])

