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more edge cases

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J. Nick Koston
2026-01-30 01:22:32 -06:00
parent d31a860bf2
commit e3a99f12e4
1 changed files with 74 additions and 0 deletions
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tests/components/time/posix_tz_parser.cpp
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@@ -1126,4 +1126,78 @@ TEST(RecalcTimestampLocal, SouthernHemisphereDST) {
EXPECT_EQ(esp_result, libc_result);
}
TEST(RecalcTimestampLocal, ExactTransitionBoundary) {
// Test exact boundary of spring forward transition
// Mar 8, 2026 at 2:00 AM CST -> 3:00 AM CDT (clocks skip forward)
const char *tz_str = "CST6CDT,M3.2.0,M11.1.0";
setenv("TZ", tz_str, 1);
tzset();
time::ParsedTimezone tz{};
ASSERT_TRUE(parse_posix_tz(tz_str, tz));
set_global_tz(tz);
// 1:59:59 AM CST - last second before transition (still standard time)
time_t libc_result = libc_mktime(2026, 3, 8, 1, 59, 59);
time_t esp_result = esptime_recalc_local(2026, 3, 8, 1, 59, 59);
EXPECT_EQ(esp_result, libc_result);
// 3:00:00 AM CDT - first second after transition (now DST)
libc_result = libc_mktime(2026, 3, 8, 3, 0, 0);
esp_result = esptime_recalc_local(2026, 3, 8, 3, 0, 0);
EXPECT_EQ(esp_result, libc_result);
// Verify the gap: 3:00 AM CDT should be exactly 1 second after 1:59:59 AM CST
time_t before_transition = esptime_recalc_local(2026, 3, 8, 1, 59, 59);
time_t after_transition = esptime_recalc_local(2026, 3, 8, 3, 0, 0);
EXPECT_EQ(after_transition - before_transition, 1);
}
TEST(RecalcTimestampLocal, NonDefaultTransitionTime) {
// Test DST transition at 3:00 AM instead of default 2:00 AM
// Using custom transition time: CST6CDT,M3.2.0/3,M11.1.0/3
const char *tz_str = "CST6CDT,M3.2.0/3,M11.1.0/3";
setenv("TZ", tz_str, 1);
tzset();
time::ParsedTimezone tz{};
ASSERT_TRUE(parse_posix_tz(tz_str, tz));
set_global_tz(tz);
// 2:30 AM should still be standard time (transition at 3:00 AM)
time_t libc_result = libc_mktime(2026, 3, 8, 2, 30, 0);
time_t esp_result = esptime_recalc_local(2026, 3, 8, 2, 30, 0);
EXPECT_EQ(esp_result, libc_result);
// 4:00 AM should be DST (after 3:00 AM transition)
libc_result = libc_mktime(2026, 3, 8, 4, 0, 0);
esp_result = esptime_recalc_local(2026, 3, 8, 4, 0, 0);
EXPECT_EQ(esp_result, libc_result);
}
TEST(RecalcTimestampLocal, YearBoundaryDST) {
// Test southern hemisphere DST across year boundary
// Australia/Sydney: DST active from October to April (spans Jan 1)
const char *tz_str = "AEST-10AEDT,M10.1.0,M4.1.0";
setenv("TZ", tz_str, 1);
tzset();
time::ParsedTimezone tz{};
ASSERT_TRUE(parse_posix_tz(tz_str, tz));
set_global_tz(tz);
// Dec 31, 2025 at 23:30 - DST should be active
time_t libc_result = libc_mktime(2025, 12, 31, 23, 30, 0);
time_t esp_result = esptime_recalc_local(2025, 12, 31, 23, 30, 0);
EXPECT_EQ(esp_result, libc_result);
// Jan 1, 2026 at 00:30 - DST should still be active
libc_result = libc_mktime(2026, 1, 1, 0, 30, 0);
esp_result = esptime_recalc_local(2026, 1, 1, 0, 30, 0);
EXPECT_EQ(esp_result, libc_result);
// Verify both are in DST (11 hour offset from UTC, not 10)
// The timestamps should be 1 hour apart
time_t dec31 = esptime_recalc_local(2025, 12, 31, 23, 30, 0);
time_t jan1 = esptime_recalc_local(2026, 1, 1, 0, 30, 0);
EXPECT_EQ(jan1 - dec31, 3600); // 1 hour difference
}
} // namespace esphome::testing