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b31c11bca5
It's expensive to determine the system time zone from disk each time it is requested. This makes LibUnicode cache the result, and provides an API to clear that cache. This will let us set up a monitor to watch for system time zone changes in platform-dependent ways.
146 lines
7.4 KiB
C++
146 lines
7.4 KiB
C++
/*
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* Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/StringView.h>
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#include <LibCore/Environment.h>
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#include <LibUnicode/TimeZone.h>
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class TimeZoneGuard {
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public:
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explicit TimeZoneGuard(StringView time_zone)
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: m_time_zone(Core::Environment::get("TZ"sv))
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{
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MUST(Core::Environment::set("TZ"sv, time_zone, Core::Environment::Overwrite::Yes));
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Unicode::clear_system_time_zone_cache();
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}
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~TimeZoneGuard()
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{
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if (m_time_zone.has_value())
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MUST(Core::Environment::set("TZ"sv, *m_time_zone, Core::Environment::Overwrite::Yes));
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else
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MUST(Core::Environment::unset("TZ"sv));
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Unicode::clear_system_time_zone_cache();
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}
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private:
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Optional<StringView> m_time_zone;
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};
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TEST_CASE(current_time_zone)
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{
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{
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TimeZoneGuard guard { "America/New_York"sv };
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EXPECT_EQ(Unicode::current_time_zone(), "America/New_York"sv);
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}
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{
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TimeZoneGuard guard { "ladybird"sv };
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EXPECT_EQ(Unicode::current_time_zone(), "UTC"sv);
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}
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}
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TEST_CASE(available_time_zones)
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{
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auto const& time_zones = Unicode::available_time_zones();
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EXPECT(time_zones.contains_slow("UTC"sv));
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EXPECT(!time_zones.contains_slow("EAT"sv));
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}
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TEST_CASE(available_time_zones_in_region)
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{
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{
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auto time_zones = Unicode::available_time_zones_in_region("AD"sv);
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EXPECT_EQ(time_zones, to_array({ "Europe/Andorra"_string }));
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}
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{
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auto time_zones = Unicode::available_time_zones_in_region("ES"sv);
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EXPECT_EQ(time_zones, to_array({ "Africa/Ceuta"_string, "Atlantic/Canary"_string, "Europe/Madrid"_string }));
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}
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}
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TEST_CASE(resolve_primary_time_zone)
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{
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EXPECT_EQ(Unicode::resolve_primary_time_zone("UTC"sv), "Etc/UTC"sv);
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EXPECT_EQ(Unicode::resolve_primary_time_zone("Asia/Katmandu"sv), "Asia/Kathmandu"sv);
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EXPECT_EQ(Unicode::resolve_primary_time_zone("Australia/Canberra"sv), "Australia/Sydney"sv);
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}
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using enum Unicode::TimeZoneOffset::InDST;
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static void test_offset(StringView time_zone, i64 time, AK::Duration expected_offset, Unicode::TimeZoneOffset::InDST expected_in_dst)
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{
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auto actual_offset = Unicode::time_zone_offset(time_zone, AK::UnixDateTime::from_seconds_since_epoch(time));
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VERIFY(actual_offset.has_value());
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EXPECT_EQ(actual_offset->offset, expected_offset);
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EXPECT_EQ(actual_offset->in_dst, expected_in_dst);
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}
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static constexpr AK::Duration offset(i64 sign, i64 hours, i64 minutes, i64 seconds)
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{
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return AK::Duration::from_seconds(sign * ((hours * 3600) + (minutes * 60) + seconds));
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}
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// Useful website to convert times in the TZDB (which sometimes are and aren't UTC) to UTC and the desired local time:
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// https://www.epochconverter.com/#tools
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//
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// In the tests below, if only UTC time is shown as a comment, then the corresponding Rule change in the TZDB was specified
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// as UTC. Otherwise, the TZDB time was local, and was converted to a UTC timestamp for that test.
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TEST_CASE(time_zone_offset)
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{
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EXPECT(!Unicode::time_zone_offset("I don't exist"sv, {}).has_value());
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test_offset("America/Chicago"sv, -2717647201, offset(-1, 5, 50, 36), No); // November 18, 1883 5:59:59 PM UTC
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test_offset("America/Chicago"sv, -2717647200, offset(-1, 6, 0, 0), No); // November 18, 1883 6:00:00 PM UTC
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test_offset("America/Chicago"sv, -1067788860, offset(-1, 6, 0, 0), No); // March 1, 1936 1:59:00 AM Chicago (March 1, 1936 7:59:00 AM UTC)
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test_offset("America/Chicago"sv, -1067788800, offset(-1, 5, 0, 0), No); // March 1, 1936 3:00:00 AM Chicago (March 1, 1936 8:00:00 AM UTC)
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test_offset("America/Chicago"sv, -1045414860, offset(-1, 5, 0, 0), No); // November 15, 1936 1:59:00 AM Chicago (November 15, 1936 6:59:00 AM UTC)
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test_offset("America/Chicago"sv, -1045411200, offset(-1, 6, 0, 0), No); // November 15, 1936 2:00:00 AM Chicago (November 15, 1936 8:00:00 AM UTC)
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test_offset("Europe/London"sv, -3852662326, offset(-1, 0, 1, 15), No); // November 30, 1847 11:59:59 PM London (December 1, 1847 12:01:14 AM UTC)
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test_offset("Europe/London"sv, -3852662325, offset(+1, 0, 0, 0), No); // December 1, 1847 12:01:15 AM London (December 1, 1847 12:01:15 AM UTC)
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test_offset("Europe/London"sv, -59004001, offset(+1, 0, 0, 0), No); // February 18, 1968 1:59:59 AM London (February 18, 1968 1:59:59 AM UTC)
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test_offset("Europe/London"sv, -59004000, offset(+1, 1, 0, 0), Yes); // February 18, 1968 3:00:00 AM London (February 18, 1968 2:00:00 AM UTC)
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test_offset("Europe/London"sv, 57722399, offset(+1, 1, 0, 0), No); // October 31, 1971 1:59:59 AM UTC
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test_offset("Europe/London"sv, 57722400, offset(+1, 0, 0, 0), No); // October 31, 1971 2:00:00 AM UTC
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test_offset("UTC"sv, -1641846268, offset(+1, 0, 00, 00), No);
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test_offset("UTC"sv, 0, offset(+1, 0, 00, 00), No);
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test_offset("UTC"sv, 1641846268, offset(+1, 0, 00, 00), No);
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test_offset("Etc/GMT+4"sv, -1641846268, offset(-1, 4, 00, 00), No);
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test_offset("Etc/GMT+5"sv, 0, offset(-1, 5, 00, 00), No);
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test_offset("Etc/GMT+6"sv, 1641846268, offset(-1, 6, 00, 00), No);
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test_offset("Etc/GMT-12"sv, -1641846268, offset(+1, 12, 00, 00), No);
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test_offset("Etc/GMT-13"sv, 0, offset(+1, 13, 00, 00), No);
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test_offset("Etc/GMT-14"sv, 1641846268, offset(+1, 14, 00, 00), No);
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}
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TEST_CASE(time_zone_offset_with_dst)
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{
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test_offset("America/New_York"sv, 1642576528, offset(-1, 5, 00, 00), No); // January 19, 2022 2:15:28 AM New York (January 19, 2022 7:15:28 AM UTC)
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test_offset("America/New_York"sv, 1663568128, offset(-1, 4, 00, 00), Yes); // September 19, 2022 2:15:28 AM New York (September 19, 2022 6:15:28 AM UTC)
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test_offset("America/New_York"sv, 1671471238, offset(-1, 5, 00, 00), No); // December 19, 2022 12:33:58 PM New York (December 19, 2022 5:33:58 PM UTC)
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// Phoenix does not observe DST.
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test_offset("America/Phoenix"sv, 1642583728, offset(-1, 7, 00, 00), No); // January 19, 2022 2:15:28 AM Phoenix (January 19, 2022 9:15:28 AM UTC)
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test_offset("America/Phoenix"sv, 1663578928, offset(-1, 7, 00, 00), No); // September 19, 2022 2:15:28 AM Phoenix (September 19, 2022 9:15:28 AM UTC)
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test_offset("America/Phoenix"sv, 1671478438, offset(-1, 7, 00, 00), No); // December 19, 2022 12:33:58 PM Phoenix (December 19, 2022 7:33:58 PM UTC)
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// Moscow's observed DST changed several times in 1919.
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test_offset("Europe/Moscow"sv, -1609459200, offset(+1, 3, 31, 19), Yes); // January 1, 1919 12:00:00 AM UTC
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test_offset("Europe/Moscow"sv, -1596429079, offset(+1, 4, 31, 19), Yes); // June 1, 1919 12:00:00 AM Moscow (May 31, 1919 7:28:41 PM UTC)
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test_offset("Europe/Moscow"sv, -1592625600, offset(+1, 4, 00, 00), Yes); // July 15, 1919 12:00:00 AM Moscow (July 14, 1919 8:00:00 PM UTC)
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test_offset("Europe/Moscow"sv, -1589079600, offset(+1, 3, 00, 00), No); // August 25, 1919 12:00:00 AM Moscow (August 24, 1919 9:00:00 PM UTC)
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// Paraguay begins the year in DST.
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test_offset("America/Asuncion"sv, 1642569328, offset(-1, 3, 00, 00), Yes); // January 19, 2022 2:15:28 AM Asuncion (January 19, 2022 5:15:28 AM UTC)
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test_offset("America/Asuncion"sv, 1663568128, offset(-1, 4, 00, 00), No); // September 19, 2022 2:15:28 AM Asuncion (September 19, 2022 6:15:28 AM UTC)
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test_offset("America/Asuncion"sv, 1671464038, offset(-1, 3, 00, 00), Yes); // December 19, 2022 12:33:58 PM Asuncion (December 19, 2022 3:33:58 PM UTC)
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}
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