o .j @sdZddlZGdddZdS)ajTest for Issue #321 - AssertionError with VTIMEZONE containing only DAYLIGHT. When a VTIMEZONE component contains only a DAYLIGHT subcomponent (no STANDARD), converting it to a pytz timezone with lookup_tzid=False would fail with an AssertionError. The issue occurs because the code assumes it can find a non-DST (STANDARD) transition to calculate the dst_offset, but when only DAYLIGHT exists, this assumption fails. Original issue: https://github.com/collective/icalendar/issues/321 Original PR with test case: https://github.com/collective/icalendar/pull/379 Test case by: @niccokunzmann Fix by: @SashankBhamidi Nc@s.eZdZdZejddZddZddZdS) TestIssue321DstOffsetz7Test VTIMEZONE conversion with only DAYLIGHT component.cCs|jS)z6Load calendar with VTIMEZONE containing only DAYLIGHT.)(issue_321_assert_dst_offset_is_not_false)self calendarsr^/home/thesage/.local/lib/python3.10/site-packages/icalendar/tests/test_issue_321_dst_offset.pycalendar_with_only_daylightsz1TestIssue321DstOffset.calendar_with_only_daylightcCsFt|d}|jdksJ|ddksJ|}|dus!JdS)a Test that VTIMEZONE with only DAYLIGHT can be converted to timezone. This tests the specific case from issue #321 where a calendar generated by khal had a VTIMEZONE with only DAYLIGHT, causing an AssertionError when calling to_tz().  VTIMEZONETZID Europe/BerlinN)listwalknameto_tz)rrtimezonetzrrr:test_vtimezone_with_only_daylight_does_not_raise_assertions  zPTestIssue321DstOffset.test_vtimezone_with_only_daylight_does_not_raise_assertioncCs\tjdddddlm}|}t|d}|j|dd}|d us%J|jd ks,Jd S) aTest forced timezone creation with lookup_tzid=False. This is a more stringent test that forces timezone creation from the VTIMEZONE definition rather than looking up an existing timezone. This was the specific case that triggered the AssertionError. pytzzThis test requires pytz)reasonr)PYTZr F)tzp lookup_tzidNr )pytest importorskipicalendar.timezone.pytzrr rrzone)rrr pytz_providerrrrrr1test_vtimezone_with_only_daylight_forced_creation.s  zGTestIssue321DstOffset.test_vtimezone_with_only_daylight_forced_creationN) __name__ __module__ __qualname____doc__rfixturerrrrrrrrs   r)r"rrrrrrs