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import os
import sys
from pathlib import Path
from unittest import mock
import pytest
from scrapy.item import Field, Item
from scrapy.utils.misc import (
arg_to_iter,
build_from_crawler,
create_instance,
load_object,
rel_has_nofollow,
set_environ,
walk_modules,
)
class TestUtilsMisc:
def test_load_object_class(self):
obj = load_object(Field)
assert obj is Field
obj = load_object("scrapy.item.Field")
assert obj is Field
def test_load_object_function(self):
obj = load_object(load_object)
assert obj is load_object
obj = load_object("scrapy.utils.misc.load_object")
assert obj is load_object
def test_load_object_exceptions(self):
with pytest.raises(ImportError):
load_object("nomodule999.mod.function")
with pytest.raises(NameError):
load_object("scrapy.utils.misc.load_object999")
with pytest.raises(TypeError):
load_object({})
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",
]
assert {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",
]
assert {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",
]
assert {m.__name__ for m in mods} == set(expected)
with pytest.raises(ImportError):
walk_modules("nomodule999")
def test_walk_modules_egg(self):
egg = str(Path(__file__).parent / "test.egg")
sys.path.append(egg)
try:
mods = walk_modules("testegg")
expected = [
"testegg.spiders",
"testegg.spiders.a",
"testegg.spiders.b",
"testegg",
]
assert {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__")
assert not list(arg_to_iter(None))
assert list(arg_to_iter("lala")) == ["lala"]
assert list(arg_to_iter(100)) == [100]
assert list(arg_to_iter(c for c in "abc")) == ["a", "b", "c"]
assert list(arg_to_iter([1, 2, 3])) == [1, 2, 3]
assert list(arg_to_iter({"a": 1})) == [{"a": 1}]
assert list(arg_to_iter(TestItem(name="john"))) == [TestItem(name="john")]
@pytest.mark.filterwarnings("ignore::scrapy.exceptions.ScrapyDeprecationWarning")
def test_create_instance(self):
settings = mock.MagicMock()
crawler = mock.MagicMock(spec_set=["settings"])
args = (True, 100.0)
kwargs = {"key": "val"}
def _test_with_settings(mock, settings):
create_instance(mock, settings, None, *args, **kwargs)
if hasattr(mock, "from_crawler"):
assert mock.from_crawler.call_count == 0
if hasattr(mock, "from_settings"):
mock.from_settings.assert_called_once_with(settings, *args, **kwargs)
assert 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"):
assert mock.from_settings.call_count == 0
assert mock.call_count == 0
elif hasattr(mock, "from_settings"):
mock.from_settings.assert_called_once_with(settings, *args, **kwargs)
assert 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 pytest.raises(
ValueError, match="Specify at least one of settings and crawler"
):
create_instance(m, None, None)
m.from_settings.return_value = None
with pytest.raises(TypeError):
create_instance(m, settings, None)
def test_build_from_crawler(self):
settings = mock.MagicMock()
crawler = mock.MagicMock(spec_set=["settings"])
args = (True, 100.0)
kwargs = {"key": "val"}
def _test_with_crawler(mock, settings, crawler):
build_from_crawler(mock, crawler, *args, **kwargs)
if hasattr(mock, "from_crawler"):
mock.from_crawler.assert_called_once_with(crawler, *args, **kwargs)
if hasattr(mock, "from_settings"):
assert mock.from_settings.call_count == 0
assert mock.call_count == 0
elif hasattr(mock, "from_settings"):
mock.from_settings.assert_called_once_with(settings, *args, **kwargs)
assert mock.call_count == 0
else:
mock.assert_called_once_with(*args, **kwargs)
# Check usage of correct constructor using three mocks:
# 1. with no alternative constructors
# 2. with from_crawler() constructor
# 3. with from_settings() and from_crawler() constructor
spec_sets = (
["__qualname__"],
["__qualname__", "from_crawler"],
["__qualname__", "from_settings", "from_crawler"],
)
for specs in spec_sets:
m = mock.MagicMock(spec_set=specs)
_test_with_crawler(m, settings, crawler)
m.reset_mock()
# Check adoption of crawler
m = mock.MagicMock(spec_set=["__qualname__", "from_crawler"])
m.from_crawler.return_value = None
with pytest.raises(TypeError):
build_from_crawler(m, crawler, *args, **kwargs)
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"
def test_rel_has_nofollow(self):
assert rel_has_nofollow("ugc nofollow") is True
assert rel_has_nofollow("ugc,nofollow") is True
assert rel_has_nofollow("ugc") is False
assert rel_has_nofollow("nofollow") is True
assert rel_has_nofollow("nofollowfoo") is False
assert rel_has_nofollow("foonofollow") is False
assert rel_has_nofollow("ugc, , nofollow") is True
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