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# distbuild/sm_tests.py -- unit tests for state machine abstraction
#
# Copyright (C) 2012, 2014 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA..
import unittest
import distbuild
class DummyEventSource(object):
pass
class DummyEvent(object):
pass
class StateMachineTests(unittest.TestCase):
def setUp(self):
self.sm = distbuild.StateMachine('init')
self.sm.distbuild = None
self.sm.setup()
self.event_source = DummyEventSource()
self.event = DummyEvent()
self.event_sources = []
self.events = []
self.callback_result = None
def callback(self, event_source, event):
self.event_sources.append(event_source)
self.events.append(event)
return self.callback_result
def test_ignores_event_when_there_are_no_transitions(self):
new_events = self.sm.handle_event(self.event_source, self.event)
self.assertEqual(new_events, [])
self.assertEqual(self.event_sources, [])
self.assertEqual(self.events, [])
def test_ignores_event_when_no_transition_matches(self):
spec = [
('init', self.event_source, str, 'init', self.callback),
]
self.sm.add_transitions(spec)
new_events = self.sm.handle_event(self.event_source, self.event)
self.assertEqual(new_events, [])
self.assertEqual(self.event_sources, [])
self.assertEqual(self.events, [])
def test_handles_lack_of_callback_ok(self):
spec = [
('init', self.event_source, DummyEvent, 'init', None),
]
self.sm.add_transitions(spec)
new_events = self.sm.handle_event(self.event_source, self.event)
self.assertEqual(new_events, [])
self.assertEqual(self.event_sources, [])
self.assertEqual(self.events, [])
def test_calls_registered_callback_for_right_event(self):
spec = [
('init', self.event_source, DummyEvent, 'init', self.callback),
]
self.sm.add_transitions(spec)
new_events = self.sm.handle_event(self.event_source, self.event)
self.assertEqual(new_events, [])
self.assertEqual(self.event_sources, [self.event_source])
self.assertEqual(self.events, [self.event])
def test_handle_converts_nonlist_to_list(self):
self.callback_result = ('foo', 'bar')
spec = [
('init', self.event_source, DummyEvent, 'init', self.callback),
]
self.sm.add_transitions(spec)
new_events = self.sm.handle_event(self.event_source, self.event)
self.assertEqual(new_events, ['foo', 'bar'])
self.assertEqual(self.event_sources, [self.event_source])
self.assertEqual(self.events, [self.event])
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