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from __future__ import with_statement
import unittest
import mock
from flake8 import engine, util, __version__
class TestEngine(unittest.TestCase):
def setUp(self):
self.patches = {}
def tearDown(self):
assert len(self.patches.items()) == 0
def start_patch(self, patch):
self.patches[patch] = mock.patch(patch)
return self.patches[patch].start()
def stop_patches(self):
patches = self.patches.copy()
for k, v in patches.items():
v.stop()
del(self.patches[k])
def test_get_style_guide(self):
with mock.patch('flake8.engine._register_extensions') as reg_ext:
reg_ext.return_value = ([], [], [])
g = engine.get_style_guide()
self.assertTrue(isinstance(g, engine.StyleGuide))
reg_ext.assert_called_once_with()
def test_get_style_guide_kwargs(self):
m = mock.Mock()
with mock.patch('flake8.engine.StyleGuide') as StyleGuide:
with mock.patch('flake8.engine.get_parser') as get_parser:
StyleGuide.return_value.options.jobs = '42'
get_parser.return_value = (m, [])
engine.get_style_guide(foo='bar')
get_parser.assert_called_once_with()
StyleGuide.assert_called_once_with(**{'parser': m, 'foo': 'bar'})
def test_register_extensions(self):
with mock.patch('pep8.register_check') as register_check:
registered_exts = engine._register_extensions()
self.assertTrue(isinstance(registered_exts[0], util.OrderedSet))
self.assertTrue(len(registered_exts[0]) > 0)
for i in registered_exts[1:]:
self.assertTrue(isinstance(i, list))
register_check.assert_called()
def test_get_parser(self):
# setup
re = self.start_patch('flake8.engine._register_extensions')
gpv = self.start_patch('flake8.engine.get_python_version')
pgp = self.start_patch('pep8.get_parser')
m = mock.Mock()
re.return_value = ([('pyflakes', '0.7'), ('mccabe', '0.2')], [], [])
gpv.return_value = 'Python Version'
pgp.return_value = m
# actual call we're testing
parser, hooks = engine.get_parser()
# assertions
re.assert_called()
gpv.assert_called()
pgp.assert_called_once_with(
'flake8',
'%s (pyflakes: 0.7, mccabe: 0.2) Python Version' % __version__)
m.remove_option.assert_called()
m.add_option.assert_called()
self.assertEqual(parser, m)
self.assertEqual(hooks, [])
# clean-up
self.stop_patches()
def test_get_python_version(self):
self.assertTrue('on' in engine.get_python_version())
# Silly test but it will provide 100% test coverage
# Also we can never be sure (without reconstructing the string
# ourselves) what system we may be testing on.
if __name__ == '__main__':
unittest.main()
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