def test_issue_188_timezone_dropped():
assert "DTSTART;TZID={tzid}:20200121T070000".format(tzid=Timezone.from_tzid("Europe/Berlin").tzid) in Calendar(fixture1).serialize()
assert "DTSTART;TZID={tzid}:20200121T070000".format(tzid="W. Europe Standard Time") in Calendar(fixture2).serialize()
assert "DTSTART;TZID={tzid}:20200121T070000".format(tzid="Europe/Berlin") in Calendar(fixture3).serialize()
pacific = Timezone.from_tzid("US/Pacific")
assert pacific.tzid.endswith("America/Los_Angeles")
event1 = Event(begin=datetime(2014, 1, 1, 0, 0, 0, tzinfo=gettz("US/Pacific")))
event1.dtstamp = event1.dtstamp.replace(microsecond=0)
ser1 = Calendar(events=[event1]).serialize()
assert "DTSTART:20140101T000000Z" not in ser1
assert "DTSTART;TZID=%s:20140101T000000" % pacific.tzid in ser1
event2 = event1.clone()
event2.begin = datetime(2014, 1, 1, 0, 0, 0, tzinfo=pacific)
ser2 = Calendar(events=[event1]).serialize()
assert "DTSTART:20140101T000000Z" not in ser2
assert "DTSTART;TZID=%s:20140101T000000" % pacific.tzid in ser2
assert event1 == event2
assert event1.begin == event2.begin
assert event1.begin.tzinfo != event2.begin.tzinfo
assert ser1 == ser2
deser1 = Calendar(ser1).events[0]
deser2 = Calendar(ser2).events[0]
assert deser1 == deser2
assert deser1 == event2
