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Handle rest_framework.throttling.SimpleRateThrottle #459

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Handle rest_framework.throttling.SimpleRateThrottle #459

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test(rest_framework.throttling.SimpleRateThrottle): reproduce the error
JulianMaurin Jul 19, 2022
4313a88
fix(fake_time): accept any args/kwargs
JulianMaurin Jul 19, 2022
9d2b92f
refacto(test_class_import): factorize tests introducting the _date_to…
JulianMaurin Jul 20, 2022
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2 changes: 1 addition & 1 deletion freezegun/api.py
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Original file line number Diff line number Diff line change
Expand Up @@ -170,7 +170,7 @@ def get_current_time():
return freeze_factories[-1]()


def fake_time():
def fake_time(*args, **kwargs):
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Why *args, **kwargs here? That seems very wrong to me.

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Hello @boxed ,
Thanks for your review. May I humbly ask you to elaborate?

I think I made an effort to explain the reproduction of the bug, both in the description and in the test.
If I'm off track, can you possibly guide me to a solution that you think is more appropriate?

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@JulianMaurin this is breaking the API typing on api.pyi, so users that have mypy will have problems. I also think you can add typed arguments to satisfy your needs with default arguments=None so it will also not break current applications and maintain the types well defined.

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@JulianMaurin JulianMaurin Aug 11, 2022 •
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I thought this version does not break the application, in addition, fake_time function is not defined in api.pyi, but maybe I did not understand something.

Would you prefer this version (with a docstring ofc):

Suggested change
def fake_time(*args, **kwargs):
def fake_time(_ : Any):

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@JulianMaurin putting an argument of type Any makes the method still untyped. Also as @boxed adding *args, **kwargs here does not make sense to me also, since to fix the bug you one need to be able to call time it with self.

You can check in the definition of builtin time.time there is NO argument whatsoever: https://github.com/python/cpython/blob/v3.9.6/Modules/timemodule.c#L86

Have to tried, instead of adding arguments, wrapping fake_time with @classmethod? Maybe it will fix this usage. If not I am sure some kind of wrapper like this will be needed.

if _should_use_real_time():
return real_time()
current_time = get_current_time()
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19 changes: 19 additions & 0 deletions tests/fake_module_lazy.py
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@@ -0,0 +1,19 @@
"""
Lazy module aims to reproduce the context of late loaded modules
Eg. testing a django view using the test client
"""

def load():
import time

class TimeAsClassAttribute:
"""
Reproduce the behaviour of: rest_framework.throttling.SimpleRateThrottle
see: https://github.com/encode/django-rest-framework/blob/3.13.1/rest_framework/throttling.py#L63
"""
_time = time.time

def call_time(self):
return self._time()

globals()["TimeAsClassAttribute"] = TimeAsClassAttribute
15 changes: 15 additions & 0 deletions tests/test_class_import.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,8 @@
import time
import sys

import pytest

from .fake_module import (
fake_date_function,
fake_datetime_function,
Expand All @@ -9,6 +12,7 @@
fake_time_function,
)
from . import fake_module
from . import fake_module_lazy
from freezegun import freeze_time
from freezegun.api import (
FakeDatetime,
Expand Down Expand Up @@ -130,6 +134,17 @@ def test_fake_strftime_function():
assert fake_strftime_function() == '2012'


@freeze_time("2022-01-01")
def test_fake_time_function_as_class_attribute():
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It is great that you added tests, but it is also important to explain on README the new optional usage in English so more people can easily reuse your solution =)

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You can also add some description of this change on CHANGELOG.

local_time = datetime.datetime(2022, 1, 1)
utc_time = local_time - datetime.timedelta(seconds=time.timezone)
expected_timestamp = time.mktime(utc_time.timetuple())
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fake_module_lazy.load()

assert fake_module_lazy.TimeAsClassAttribute().call_time() == expected_timestamp


def test_import_after_start():
with freeze_time('2012-01-14'):
assert 'tests.another_module' not in sys.modules.keys()
Expand Down