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import datetime
import os
import time
from contextlib import contextmanager
import pytest
from dateutil import tz
@contextmanager
def stub_timezone_ctx(tzname):
"""
Switch to a locally-known timezone specified by `tzname`.
On exit, restore the previous timezone.
If `tzname` is `None`, do nothing.
"""
if tzname is None:
yield
return
# Only supported on Unix
if not hasattr(time, "tzset"):
pytest.skip("Timezone patching is not supported")
# Make sure the new timezone exists, at least in dateutil
new_tz = tz.gettz(tzname)
if new_tz is None:
raise ValueError("Invalid timezone specified: %r" % (tzname,))
# Get the current timezone
local_tz = tz.tzlocal()
if local_tz is None:
raise EnvironmentError("Cannot determine current timezone")
old_tzname = datetime.datetime.now(local_tz).tzname()
os.environ["TZ"] = tzname
time.tzset()
yield
os.environ["TZ"] = old_tzname
time.tzset()
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