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test: add DST boundary test for timestamp injection

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Verifies that America/New_York correctly resolves to midnight for
both EST (winter, UTC-5) and EDT (summer, UTC-4) using the same
IANA timezone. Intl.DateTimeFormat handles the DST transition.
This commit is contained in:
Conroy Whitney
2026-01-28 21:46:29 -05:00
committed by Shakker
parent 3696532f04
commit 9d28763753
1 changed files with 20 additions and 0 deletions
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20
src/gateway/server-methods/agent-timestamp.test.ts
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@@ -97,6 +97,26 @@ describe("injectTimestamp", () => {
expect(result).toContain("11:59 PM");
});
it("handles DST correctly (same UTC hour, different local time)", () => {
// EST (winter): UTC-5 → 2026-01-15T05:00Z = midnight Jan 15
vi.setSystemTime(new Date("2026-01-15T05:00:00.000Z"));
const winter = injectTimestamp("winter", {
timezone: "America/New_York",
timeFormat: "12",
});
expect(winter).toContain("January 15");
expect(winter).toContain("12:00 AM");
// EDT (summer): UTC-4 → 2026-07-15T04:00Z = midnight Jul 15
vi.setSystemTime(new Date("2026-07-15T04:00:00.000Z"));
const summer = injectTimestamp("summer", {
timezone: "America/New_York",
timeFormat: "12",
});
expect(summer).toContain("July 15");
expect(summer).toContain("12:00 AM");
});
it("accepts a custom now date", () => {
const customDate = new Date("2025-07-04T16:00:00.000Z"); // July 4, noon EST