66 lines
2.6 KiB
TypeScript
66 lines
2.6 KiB
TypeScript
import * as fs from "node:fs";
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import * as path from "node:path";
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import { describe, expect, it } from "vitest";
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import { formatLocalIsoWithOffset, isValidTimeZone } from "./timestamps.js";
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describe("formatLocalIsoWithOffset", () => {
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const testDate = new Date("2025-01-01T04:00:00.000Z");
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it("produces +00:00 offset for UTC", () => {
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const result = formatLocalIsoWithOffset(testDate, "UTC");
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expect(result).toBe("2025-01-01T04:00:00.000+00:00");
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});
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it("produces +08:00 offset for Asia/Shanghai", () => {
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const result = formatLocalIsoWithOffset(testDate, "Asia/Shanghai");
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expect(result).toBe("2025-01-01T12:00:00.000+08:00");
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});
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it("produces correct offset for America/New_York", () => {
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const result = formatLocalIsoWithOffset(testDate, "America/New_York");
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// January is EST = UTC-5
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expect(result).toBe("2024-12-31T23:00:00.000-05:00");
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});
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it("produces correct offset for America/New_York in summer (EDT)", () => {
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const summerDate = new Date("2025-07-01T12:00:00.000Z");
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const result = formatLocalIsoWithOffset(summerDate, "America/New_York");
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// July is EDT = UTC-4
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expect(result).toBe("2025-07-01T08:00:00.000-04:00");
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});
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it("outputs a valid ISO 8601 string with offset", () => {
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const result = formatLocalIsoWithOffset(testDate, "Asia/Shanghai");
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// ISO 8601 with offset: YYYY-MM-DDTHH:MM:SS.mmm±HH:MM
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const iso8601WithOffset = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}[+-]\d{2}:\d{2}$/;
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expect(result).toMatch(iso8601WithOffset);
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});
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it("falls back gracefully for an invalid timezone", () => {
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const result = formatLocalIsoWithOffset(testDate, "not-a-tz");
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const iso8601WithOffset = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}[+-]\d{2}:\d{2}$/;
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expect(result).toMatch(iso8601WithOffset);
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});
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it("does NOT use getHours, getMinutes, getTimezoneOffset in the implementation", () => {
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const source = fs.readFileSync(path.resolve(__dirname, "timestamps.ts"), "utf-8");
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expect(source).not.toMatch(/\.getHours\s*\(/);
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expect(source).not.toMatch(/\.getMinutes\s*\(/);
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expect(source).not.toMatch(/\.getTimezoneOffset\s*\(/);
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});
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});
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describe("isValidTimeZone", () => {
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it("returns true for valid IANA timezones", () => {
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expect(isValidTimeZone("UTC")).toBe(true);
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expect(isValidTimeZone("America/New_York")).toBe(true);
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expect(isValidTimeZone("Asia/Shanghai")).toBe(true);
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});
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it("returns false for invalid timezone strings", () => {
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expect(isValidTimeZone("not-a-tz")).toBe(false);
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expect(isValidTimeZone("yo agent's")).toBe(false);
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expect(isValidTimeZone("")).toBe(false);
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});
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});
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