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87 lines
2.8 KiB
TypeScript
87 lines
2.8 KiB
TypeScript
import { afterAll, beforeAll, describe, expect, it } from "vitest";
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import {
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getDateAtNextFullHour,
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weekNumberToDate,
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weekNumberToDateRange,
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} from "./dates";
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describe("getDateAtNextFullHour", () => {
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it("returns a date sitting exactly on a full hour (no leftover minutes/seconds/milliseconds)", () => {
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const result = getDateAtNextFullHour(new Date(2024, 0, 1, 14, 30, 0, 500));
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expect(result).toEqual(new Date(2024, 0, 1, 15, 0, 0, 0));
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});
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it("advances to the next hour when only seconds/milliseconds are past the hour", () => {
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const result = getDateAtNextFullHour(new Date(2024, 0, 1, 14, 0, 30, 0));
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expect(result).toEqual(new Date(2024, 0, 1, 15, 0, 0, 0));
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});
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it("keeps the same hour when already exactly on a full hour", () => {
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const result = getDateAtNextFullHour(new Date(2024, 0, 1, 14, 0, 0, 0));
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expect(result).toEqual(new Date(2024, 0, 1, 14, 0, 0, 0));
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});
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});
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describe("weekNumberToDate", () => {
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// Force a timezone west of UTC so the assertion is deterministic regardless
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// of where the test happens to run (the bug only manifests west of UTC).
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const originalTimezone = process.env.TZ;
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beforeAll(() => {
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process.env.TZ = "America/Los_Angeles";
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});
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afterAll(() => {
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process.env.TZ = originalTimezone;
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});
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it("returns the Monday of the ISO week regardless of server timezone", () => {
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// ISO week 1 of 2024 starts on Monday 2024-01-01
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const start = weekNumberToDate({ week: 1, year: 2024 });
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expect(start.toISOString().slice(0, 10)).toBe("2024-01-01");
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});
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it("returns the Sunday of the ISO week regardless of server timezone", () => {
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// ISO week 1 of 2024 ends on Sunday 2024-01-07
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const end = weekNumberToDate({ week: 1, year: 2024, position: "end" });
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expect(end.toISOString().slice(0, 10)).toBe("2024-01-07");
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});
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});
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describe("weekNumberToDateRange", () => {
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// Force a timezone west of UTC observing DST so the assertion is deterministic
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// regardless of where the test happens to run.
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const originalTimezone = process.env.TZ;
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beforeAll(() => {
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process.env.TZ = "America/New_York";
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});
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afterAll(() => {
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process.env.TZ = originalTimezone;
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});
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const SEVEN_DAYS_MS = 7 * 24 * 60 * 60 * 1000;
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it("spans exactly seven days even when the week contains a DST transition", () => {
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// US spring-forward 2025 happened on Sunday 2025-03-09, which falls inside
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// ISO week 10 of 2025 (Mon 2025-03-03 .. Mon 2025-03-10).
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const { startTime, endTime } = weekNumberToDateRange({
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week: 10,
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year: 2025,
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});
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expect(endTime.getTime() - startTime.getTime()).toBe(SEVEN_DAYS_MS);
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});
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it("spans exactly seven days for an ordinary week", () => {
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const { startTime, endTime } = weekNumberToDateRange({
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week: 20,
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year: 2025,
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});
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expect(endTime.getTime() - startTime.getTime()).toBe(SEVEN_DAYS_MS);
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});
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});
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