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test: resolve addToDate test flakiness across timezones

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Co-authored-by: Horizontal42 <75383519+Horizontal42@users.noreply.github.com>
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google-labs-jules[bot] 2026-10-07 03:59:38 +00:00
parent bede889ced
commit a3341f2d7d
1 changed files with 46 additions and 26 deletions
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72
src/engine/datetime.test.ts
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@ -99,61 +99,81 @@ describe("datetime", () => {
describe("addToDate", () => {
it("should add days", () => {
const ms = new Date("2024-01-01T12:00:00Z").getTime();
const res = addToDate(ms, 5, "day");
expect(new Date(res).toISOString()).toBe("2024-01-06T12:00:00.000Z");
const ms = new Date(2024, 0, 1, 12, 0, 0).getTime(); // local Jan 1, 12:00
const res = new Date(addToDate(ms, 5, "day"));
expect(res.getFullYear()).toBe(2024);
expect(res.getMonth()).toBe(0);
expect(res.getDate()).toBe(6);
expect(res.getHours()).toBe(12);
});
it("should add weeks", () => {
const ms = new Date("2024-01-01T12:00:00Z").getTime();
const res = addToDate(ms, 2, "week");
expect(new Date(res).toISOString()).toBe("2024-01-15T12:00:00.000Z");
const ms = new Date(2024, 0, 1, 12, 0, 0).getTime();
const res = new Date(addToDate(ms, 2, "week"));
expect(res.getFullYear()).toBe(2024);
expect(res.getMonth()).toBe(0);
expect(res.getDate()).toBe(15);
expect(res.getHours()).toBe(12);
});
it("should add months", () => {
const ms = new Date("2024-01-15T12:00:00Z").getTime();
const res = addToDate(ms, 2, "month");
expect(new Date(res).toISOString()).toBe("2024-03-15T12:00:00.000Z");
const ms = new Date(2024, 0, 15, 12, 0, 0).getTime();
const res = new Date(addToDate(ms, 2, "month"));
expect(res.getFullYear()).toBe(2024);
expect(res.getMonth()).toBe(2); // March
expect(res.getDate()).toBe(15);
expect(res.getHours()).toBe(12);
});
it("should clamp end of month correctly", () => {
const ms = new Date("2024-01-31T12:00:00Z").getTime();
const res = addToDate(ms, 1, "month");
const ms = new Date(2024, 0, 31, 12, 0, 0).getTime();
const res = new Date(addToDate(ms, 1, "month"));
// 2024 is a leap year, so Feb 29
expect(new Date(res).toISOString()).toBe("2024-02-29T12:00:00.000Z");
expect(res.getFullYear()).toBe(2024);
expect(res.getMonth()).toBe(1);
expect(res.getDate()).toBe(29);
const ms2 = new Date("2023-01-31T12:00:00Z").getTime();
const res2 = addToDate(ms2, 1, "month");
const ms2 = new Date(2023, 0, 31, 12, 0, 0).getTime();
const res2 = new Date(addToDate(ms2, 1, "month"));
// 2023 is not a leap year, so Feb 28
expect(new Date(res2).toISOString()).toBe("2023-02-28T12:00:00.000Z");
expect(res2.getFullYear()).toBe(2023);
expect(res2.getMonth()).toBe(1);
expect(res2.getDate()).toBe(28);
});
it("should add years", () => {
const ms = new Date("2024-01-15T12:00:00Z").getTime();
const res = addToDate(ms, 3, "year");
expect(new Date(res).toISOString()).toBe("2027-01-15T12:00:00.000Z");
const ms = new Date(2024, 0, 15, 12, 0, 0).getTime();
const res = new Date(addToDate(ms, 3, "year"));
expect(res.getFullYear()).toBe(2027);
expect(res.getMonth()).toBe(0);
expect(res.getDate()).toBe(15);
expect(res.getHours()).toBe(12);
});
it("should clamp end of month when adding years to leap day", () => {
const ms = new Date("2024-02-29T12:00:00Z").getTime();
const res = addToDate(ms, 1, "year");
expect(new Date(res).toISOString()).toBe("2025-02-28T12:00:00.000Z");
const ms = new Date(2024, 1, 29, 12, 0, 0).getTime();
const res = new Date(addToDate(ms, 1, "year"));
expect(res.getFullYear()).toBe(2025);
expect(res.getMonth()).toBe(1);
expect(res.getDate()).toBe(28);
});
it("should handle unit ids with prefixes", () => {
const ms = new Date("2024-01-01T12:00:00Z").getTime();
const res = addToDate(ms, 5, "unit:day");
expect(new Date(res).toISOString()).toBe("2024-01-06T12:00:00.000Z");
const ms = new Date(2024, 0, 1, 12, 0, 0).getTime();
const res = new Date(addToDate(ms, 5, "unit:day"));
expect(res.getFullYear()).toBe(2024);
expect(res.getMonth()).toBe(0);
expect(res.getDate()).toBe(6);
});
it("should return original ms if amount is not an integer", () => {
const ms = new Date("2024-01-01T12:00:00Z").getTime();
const ms = new Date(2024, 0, 1, 12, 0, 0).getTime();
const res = addToDate(ms, 1.5, "day");
expect(res).toBe(ms);
});
it("should return original ms for unhandled units", () => {
const ms = new Date("2024-01-01T12:00:00Z").getTime();
const ms = new Date(2024, 0, 1, 12, 0, 0).getTime();
const res = addToDate(ms, 1, "hour");
expect(res).toBe(ms);
});