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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142import { describe, expect, it } from "vitest";import { compactRelativeTime, formatCount, formatDate, formatDateTime, formatDuration, relativeTime, uniquePrefixLength} from "#lib/format.ts";
describe("formatCount", () => { it("leaves counts under a thousand alone", () => { expect(formatCount(0)).toBe("0"); expect(formatCount(1)).toBe("1"); expect(formatCount(999)).toBe("999"); });
it("abbreviates thousands, dropping a trailing zero decimal", () => { expect(formatCount(1000)).toBe("1k"); expect(formatCount(1200)).toBe("1.2k"); expect(formatCount(12_345)).toBe("12.3k"); expect(formatCount(999_000)).toBe("999k"); });
it("truncates instead of rounding, so a count never overflows its unit", () => { expect(formatCount(1299)).toBe("1.2k"); expect(formatCount(999_999)).toBe("999.9k"); expect(formatCount(1_999_999)).toBe("1.9m"); });
it("abbreviates millions", () => { expect(formatCount(1_000_000)).toBe("1m"); expect(formatCount(2_500_000)).toBe("2.5m"); expect(formatCount(1_200_000_000)).toBe("1200m"); });
it("renders nothing for a missing count", () => { expect(formatCount(undefined)).toBe(""); expect(formatCount(null)).toBe(""); });});
describe("formatDuration", () => { it("reads 0s under a second, so an instant run differs from one that never ran", () => { expect(formatDuration(0)).toBe("0s"); expect(formatDuration(999)).toBe("0s"); });
it("joins only the non-zero chunks", () => { expect(formatDuration(45_000)).toBe("45s"); expect(formatDuration(90_000)).toBe("1m 30s"); expect(formatDuration(3_600_000)).toBe("1h"); expect(formatDuration(90_061_000)).toBe("1d 1h 1m 1s"); });
it("rejects negative and non-finite input", () => { expect(formatDuration(-1)).toBe(""); expect(formatDuration(Number.NaN)).toBe(""); expect(formatDuration(Number.POSITIVE_INFINITY)).toBe(""); });});
describe("relativeTime", () => { const now = new Date("2026-08-18T12:00:00Z");
it("describes the past, and the future as now", () => { expect(relativeTime("2026-08-18T11:59:30Z", now)).toBe("30 seconds ago"); expect(relativeTime("2026-08-18T09:00:00Z", now)).toBe("3 hours ago"); expect(relativeTime("2026-08-15T12:00:00Z", now)).toBe("3 days ago"); expect(relativeTime("2026-08-18T14:00:00Z", now)).toBe("now"); });
it("falls back to years past the largest division", () => { expect(relativeTime("2020-08-18T12:00:00Z", now)).toBe("6 years ago"); });
it("accepts a Date and renders nothing for an unparseable string", () => { expect(relativeTime(new Date("2026-08-17T12:00:00Z"), now)).toBe("yesterday"); expect(relativeTime("not a date", now)).toBe(""); });});
describe("compactRelativeTime", () => { const now = new Date("2026-08-18T12:00:00Z");
it("truncates to the largest whole unit that fits", () => { expect(compactRelativeTime("2026-08-18T11:59:59Z", now)).toBe("1s ago"); expect(compactRelativeTime("2026-08-18T11:30:00Z", now)).toBe("30m ago"); expect(compactRelativeTime("2026-08-18T02:00:00Z", now)).toBe("10h ago"); expect(compactRelativeTime("2026-08-15T12:00:00Z", now)).toBe("3d ago"); expect(compactRelativeTime("2026-08-01T12:00:00Z", now)).toBe("2w ago"); expect(compactRelativeTime("2026-05-18T12:00:00Z", now)).toBe("3mo ago"); expect(compactRelativeTime("2020-08-18T12:00:00Z", now)).toBe("6y ago"); });
it("reads future timestamps as now", () => { expect(compactRelativeTime("2026-08-18T12:00:00Z", now)).toBe("now"); expect(compactRelativeTime("2026-08-18T12:00:30Z", now)).toBe("now"); expect(compactRelativeTime("2026-08-20T12:00:00Z", now)).toBe("now"); });
it("renders nothing for an unparseable string", () => { expect(compactRelativeTime("not a date", now)).toBe(""); });});
describe("formatDate", () => { it("renders a short month-day-year", () => { expect(formatDate(new Date(2026, 7, 18, 12))).toBe("Aug 18, 2026"); });
it("renders nothing for an unparseable string", () => { expect(formatDate("not a date")).toBe(""); });});
describe("formatDateTime", () => { it("appends a time and zone to the date", () => { // zone abbreviation depends on the runner's timezone, so match the shape expect(formatDateTime(new Date(2026, 7, 18, 15, 4))).toMatch(/^Aug 18, 2026, 3:04 PM .+$/); });
it("renders nothing for an unparseable string", () => { expect(formatDateTime("not a date")).toBe(""); });});
describe("uniquePrefixLength", () => { const ids = ["abc1", "abd2", "x9", "abc1"];
it("stops one character past the longest prefix shared with another id", () => { expect(uniquePrefixLength("abc1", ids)).toBe(3); expect(uniquePrefixLength("abd2", ids)).toBe(3); expect(uniquePrefixLength("x9", ids)).toBe(1); });
it("never runs past the id itself", () => { expect(uniquePrefixLength("ab", ["ab", "abc"])).toBe(2); });});