61 lines
2.1 KiB
TypeScript
61 lines
2.1 KiB
TypeScript
 
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import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
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import { isoDateIn, todayIn, wallClockInstant, zoneOption } from "./zone";
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import { formatClockTime } from "../today/format";
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// 13:00 UTC on Sep 23 is already 01:00 on Sep 24 in Auckland (NZST, UTC+12).
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const NOW = new Date("2026-09-23T13:00:00Z");
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describe("application timezone helpers (process in UTC)", () => {
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beforeAll(() => {
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vi.stubEnv("TZ", "UTC");
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});
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afterAll(() => {
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vi.unstubAllEnvs();
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});
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it("a stored zone decides the calendar date; empty means the browser's zone", () => {
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expect(todayIn("Pacific/Auckland", NOW)).toBe("2026-09-24");
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expect(isoDateIn(NOW, "Pacific/Auckland")).toBe("2026-09-24");
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expect(todayIn("", NOW)).toBe("2026-09-23");
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});
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it("wall-clock time converts in the stored zone, across its DST change", () => {
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// NZST (UTC+12) before 27 Sep 2026, NZDT (UTC+13) after.
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expect(wallClockInstant("2026-09-24", 0, 10, "Pacific/Auckland")).toBe(
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Date.parse("2026-09-23T12:10:00Z"),
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);
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expect(wallClockInstant("2026-09-28", 7, 30, "Pacific/Auckland")).toBe(
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Date.parse("2026-09-27T18:30:00Z"),
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);
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expect(wallClockInstant("2026-09-24", 0, 10, "")).toBe(Date.parse("2026-09-24T00:10:00Z"));
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});
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it("the completion clock reads in the stored zone", () => {
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expect(formatClockTime("2026-09-23T11:04:00Z", "Pacific/Auckland")).toBe("11:04 PM");
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expect(formatClockTime("2026-09-23T11:04:00Z", "")).toBe("11:04 AM");
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});
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it("an invalid stored zone fails fast", () => {
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expect(zoneOption("")).toBeUndefined();
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expect(() => todayIn("Not/AZone", NOW)).toThrow(RangeError);
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});
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});
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describe("empty zone keeps browser-local behavior", () => {
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beforeAll(() => {
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vi.stubEnv("TZ", "America/Los_Angeles");
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});
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afterAll(() => {
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vi.unstubAllEnvs();
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});
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it("matches the browser's own calendar and wall clock", () => {
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// 13:00 UTC is 06:00 PDT on Sep 23.
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expect(todayIn("", NOW)).toBe("2026-09-23");
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expect(wallClockInstant("2026-09-23", 7, 30, "")).toBe(new Date(2026, 8, 23, 7, 30).getTime());
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expect(formatClockTime("2026-09-23T14:04:00Z", "")).toBe("7:04 AM");
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});
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});
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