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from io import StringIO
from time import sleep, time
from unittest import mock
from twisted.trial.unittest import SkipTest
from scrapy.utils import trackref
class Foo(trackref.object_ref):
pass
class Bar(trackref.object_ref):
pass
class TestTrackref:
def setup_method(self):
trackref.live_refs.clear()
def test_format_live_refs(self):
o1 = Foo() # noqa: F841
o2 = Bar() # noqa: F841
o3 = Foo() # noqa: F841
assert (
trackref.format_live_refs()
== """\
Live References
Bar 1 oldest: 0s ago
Foo 2 oldest: 0s ago
"""
)
assert (
trackref.format_live_refs(ignore=Foo)
== """\
Live References
Bar 1 oldest: 0s ago
"""
)
@mock.patch("sys.stdout", new_callable=StringIO)
def test_print_live_refs_empty(self, stdout):
trackref.print_live_refs()
assert stdout.getvalue() == "Live References\n\n\n"
@mock.patch("sys.stdout", new_callable=StringIO)
def test_print_live_refs_with_objects(self, stdout):
o1 = Foo() # noqa: F841
trackref.print_live_refs()
assert (
stdout.getvalue()
== """\
Live References
Foo 1 oldest: 0s ago\n\n"""
)
def test_get_oldest(self):
o1 = Foo()
o1_time = time()
o2 = Bar()
o3_time = time()
if o3_time <= o1_time:
sleep(0.01)
o3_time = time()
if o3_time <= o1_time:
raise SkipTest("time.time is not precise enough")
o3 = Foo() # noqa: F841
assert trackref.get_oldest("Foo") is o1
assert trackref.get_oldest("Bar") is o2
assert trackref.get_oldest("XXX") is None
def test_iter_all(self):
o1 = Foo()
o2 = Bar() # noqa: F841
o3 = Foo()
assert set(trackref.iter_all("Foo")) == {o1, o3}
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