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import sys
import os
import unittest
from unittest import mock
from scrapy.item import Item, Field
from scrapy.utils.misc import arg_to_iter, create_instance, load_object, set_environ, walk_modules
__doctests__ = ['scrapy.utils.misc']
class UtilsMiscTestCase(unittest.TestCase):
def test_load_object_class(self):
obj = load_object(Field)
self.assertIs(obj, Field)
obj = load_object('scrapy.item.Field')
self.assertIs(obj, Field)
def test_load_object_function(self):
obj = load_object(load_object)
self.assertIs(obj, load_object)
obj = load_object('scrapy.utils.misc.load_object')
self.assertIs(obj, load_object)
def test_load_object_exceptions(self):
self.assertRaises(ImportError, load_object, 'nomodule999.mod.function')
self.assertRaises(NameError, load_object, 'scrapy.utils.misc.load_object999')
self.assertRaises(TypeError, load_object, dict())
def test_walk_modules(self):
mods = walk_modules('tests.test_utils_misc.test_walk_modules')
expected = [
'tests.test_utils_misc.test_walk_modules',
'tests.test_utils_misc.test_walk_modules.mod',
'tests.test_utils_misc.test_walk_modules.mod.mod0',
'tests.test_utils_misc.test_walk_modules.mod1',
]
self.assertEqual({m.__name__ for m in mods}, set(expected))
mods = walk_modules('tests.test_utils_misc.test_walk_modules.mod')
expected = [
'tests.test_utils_misc.test_walk_modules.mod',
'tests.test_utils_misc.test_walk_modules.mod.mod0',
]
self.assertEqual({m.__name__ for m in mods}, set(expected))
mods = walk_modules('tests.test_utils_misc.test_walk_modules.mod1')
expected = [
'tests.test_utils_misc.test_walk_modules.mod1',
]
self.assertEqual({m.__name__ for m in mods}, set(expected))
self.assertRaises(ImportError, walk_modules, 'nomodule999')
def test_walk_modules_egg(self):
egg = os.path.join(os.path.dirname(__file__), 'test.egg')
sys.path.append(egg)
try:
mods = walk_modules('testegg')
expected = [
'testegg.spiders',
'testegg.spiders.a',
'testegg.spiders.b',
'testegg'
]
self.assertEqual({m.__name__ for m in mods}, set(expected))
finally:
sys.path.remove(egg)
def test_arg_to_iter(self):
class TestItem(Item):
name = Field()
assert hasattr(arg_to_iter(None), '__iter__')
assert hasattr(arg_to_iter(100), '__iter__')
assert hasattr(arg_to_iter('lala'), '__iter__')
assert hasattr(arg_to_iter([1, 2, 3]), '__iter__')
assert hasattr(arg_to_iter(c for c in 'abcd'), '__iter__')
self.assertEqual(list(arg_to_iter(None)), [])
self.assertEqual(list(arg_to_iter('lala')), ['lala'])
self.assertEqual(list(arg_to_iter(100)), [100])
self.assertEqual(list(arg_to_iter(c for c in 'abc')), ['a', 'b', 'c'])
self.assertEqual(list(arg_to_iter([1, 2, 3])), [1, 2, 3])
self.assertEqual(list(arg_to_iter({'a': 1})), [{'a': 1}])
self.assertEqual(list(arg_to_iter(TestItem(name="john"))), [TestItem(name="john")])
def test_create_instance(self):
settings = mock.MagicMock()
crawler = mock.MagicMock(spec_set=['settings'])
args = (True, 100.)
kwargs = {'key': 'val'}
def _test_with_settings(mock, settings):
create_instance(mock, settings, None, *args, **kwargs)
if hasattr(mock, 'from_crawler'):
self.assertEqual(mock.from_crawler.call_count, 0)
if hasattr(mock, 'from_settings'):
mock.from_settings.assert_called_once_with(settings, *args,
**kwargs)
self.assertEqual(mock.call_count, 0)
else:
mock.assert_called_once_with(*args, **kwargs)
def _test_with_crawler(mock, settings, crawler):
create_instance(mock, settings, crawler, *args, **kwargs)
if hasattr(mock, 'from_crawler'):
mock.from_crawler.assert_called_once_with(crawler, *args,
**kwargs)
if hasattr(mock, 'from_settings'):
self.assertEqual(mock.from_settings.call_count, 0)
self.assertEqual(mock.call_count, 0)
elif hasattr(mock, 'from_settings'):
mock.from_settings.assert_called_once_with(settings, *args,
**kwargs)
self.assertEqual(mock.call_count, 0)
else:
mock.assert_called_once_with(*args, **kwargs)
# Check usage of correct constructor using four mocks:
# 1. with no alternative constructors
# 2. with from_settings() constructor
# 3. with from_crawler() constructor
# 4. with from_settings() and from_crawler() constructor
spec_sets = (
['__qualname__'],
['__qualname__', 'from_settings'],
['__qualname__', 'from_crawler'],
['__qualname__', 'from_settings', 'from_crawler'],
)
for specs in spec_sets:
m = mock.MagicMock(spec_set=specs)
_test_with_settings(m, settings)
m.reset_mock()
_test_with_crawler(m, settings, crawler)
# Check adoption of crawler settings
m = mock.MagicMock(spec_set=['__qualname__', 'from_settings'])
create_instance(m, None, crawler, *args, **kwargs)
m.from_settings.assert_called_once_with(crawler.settings, *args,
**kwargs)
with self.assertRaises(ValueError):
create_instance(m, None, None)
m.from_settings.return_value = None
with self.assertRaises(TypeError):
create_instance(m, settings, None)
def test_set_environ(self):
assert os.environ.get('some_test_environ') is None
with set_environ(some_test_environ='test_value'):
assert os.environ.get('some_test_environ') == 'test_value'
assert os.environ.get('some_test_environ') is None
os.environ['some_test_environ'] = 'test'
assert os.environ.get('some_test_environ') == 'test'
with set_environ(some_test_environ='test_value'):
assert os.environ.get('some_test_environ') == 'test_value'
assert os.environ.get('some_test_environ') == 'test'
if __name__ == "__main__":
unittest.main()
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