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test_adapter_attrs.py
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test_adapter_attrs.py
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import unittest
import warnings
from types import MappingProxyType
from unittest import mock
from itemadapter.utils import get_field_meta_from_class
from tests import (
AttrsItem,
DataClassItem,
PydanticModel,
ScrapyItem,
ScrapySubclassedItem,
make_mock_import,
clear_itemadapter_imports,
)
class AttrsTestCase(unittest.TestCase):
def test_false(self):
from itemadapter.adapter import AttrsAdapter
self.assertFalse(AttrsAdapter.is_item(int))
self.assertFalse(AttrsAdapter.is_item(sum))
self.assertFalse(AttrsAdapter.is_item(1234))
self.assertFalse(AttrsAdapter.is_item(object()))
self.assertFalse(AttrsAdapter.is_item(ScrapyItem()))
self.assertFalse(AttrsAdapter.is_item(DataClassItem()))
self.assertFalse(AttrsAdapter.is_item(PydanticModel()))
self.assertFalse(AttrsAdapter.is_item(ScrapySubclassedItem()))
self.assertFalse(AttrsAdapter.is_item("a string"))
self.assertFalse(AttrsAdapter.is_item(b"some bytes"))
self.assertFalse(AttrsAdapter.is_item({"a": "dict"}))
self.assertFalse(AttrsAdapter.is_item(["a", "list"]))
self.assertFalse(AttrsAdapter.is_item(("a", "tuple")))
self.assertFalse(AttrsAdapter.is_item({"a", "set"}))
self.assertFalse(AttrsAdapter.is_item(AttrsItem))
@unittest.skipIf(not AttrsItem, "attrs module is not available")
@mock.patch("builtins.__import__", make_mock_import("attr"))
def test_module_import_error(self):
with clear_itemadapter_imports():
from itemadapter.adapter import AttrsAdapter
self.assertFalse(AttrsAdapter.is_item(AttrsItem(name="asdf", value=1234)))
with self.assertRaises(RuntimeError, msg="attr module is not available"):
AttrsAdapter(AttrsItem(name="asdf", value=1234))
with self.assertRaises(RuntimeError, msg="attr module is not available"):
AttrsAdapter.get_field_meta_from_class(AttrsItem, "name")
with self.assertRaises(TypeError, msg="AttrsItem is not a valid item class"):
get_field_meta_from_class(AttrsItem, "name")
@unittest.skipIf(not AttrsItem, "attrs module is not available")
@mock.patch("itemadapter.utils.attr", None)
def test_module_not_available(self):
from itemadapter.adapter import AttrsAdapter
self.assertFalse(AttrsAdapter.is_item(AttrsItem(name="asdf", value=1234)))
with self.assertRaises(TypeError, msg="AttrsItem is not a valid item class"):
get_field_meta_from_class(AttrsItem, "name")
@unittest.skipIf(not AttrsItem, "attrs module is not available")
def test_true(self):
from itemadapter.adapter import AttrsAdapter
self.assertTrue(AttrsAdapter.is_item(AttrsItem()))
self.assertTrue(AttrsAdapter.is_item(AttrsItem(name="asdf", value=1234)))
# field metadata
self.assertEqual(
get_field_meta_from_class(AttrsItem, "name"), MappingProxyType({"serializer": str})
)
self.assertEqual(
get_field_meta_from_class(AttrsItem, "value"), MappingProxyType({"serializer": int})
)
with self.assertRaises(KeyError, msg="AttrsItem does not support field: non_existent"):
get_field_meta_from_class(AttrsItem, "non_existent")
def test_deprecated_is_instance(self):
from itemadapter.utils import is_attrs_instance
with warnings.catch_warnings(record=True) as caught:
is_attrs_instance(1)
self.assertEqual(len(caught), 1)
self.assertTrue(issubclass(caught[0].category, DeprecationWarning))
self.assertEqual(
"itemadapter.utils.is_attrs_instance is deprecated"
" and it will be removed in a future version",
str(caught[0].message),
)