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test: add test for week notes utils

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packages/commons/src/lib/week_utils.spec.ts Normal file
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import { describe, expect, it } from "vitest";
import { dayjs } from "./dayjs.js";
import { getWeekInfo, getFirstDayOfWeek1, getWeekString, WeekSettings, DEFAULT_WEEK_SETTINGS } from "./week_utils.js";
describe("week_utils", () => {
describe("getWeekInfo", () => {
describe("with firstWeekOfYear=0 (first week contains first day of year)", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 0,
minDaysInFirstWeek: 4
};
it("2025-12-29 should be 2026-W01 (cross-year week)", () => {
// 2026-01-01 is Thursday, so the week containing it starts on 2025-12-29 (Monday)
// This week should be 2026-W01 because it contains 2026-01-01
const result = getWeekInfo(dayjs("2025-12-29"), settings);
expect(result.weekYear).toBe(2026);
expect(result.weekNumber).toBe(1);
});
it("2026-01-01 should be 2026-W01", () => {
const result = getWeekInfo(dayjs("2026-01-01"), settings);
expect(result.weekYear).toBe(2026);
expect(result.weekNumber).toBe(1);
});
it("2025-12-28 should be 2025-W52", () => {
// 2025-12-28 is Sunday, which is the last day of the week starting 2025-12-22
const result = getWeekInfo(dayjs("2025-12-28"), settings);
expect(result.weekYear).toBe(2025);
expect(result.weekNumber).toBe(52);
});
it("2026-01-05 should be 2026-W02", () => {
// 2026-01-05 is Monday, start of second week
const result = getWeekInfo(dayjs("2026-01-05"), settings);
expect(result.weekYear).toBe(2026);
expect(result.weekNumber).toBe(2);
});
});
describe("with firstWeekOfYear=1 (ISO standard, first week contains first Thursday)", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 1,
minDaysInFirstWeek: 4
};
it("2023-01-01 should be 2022-W52 (Jan 1 is Sunday)", () => {
// 2023-01-01 is Sunday, so the week starts on 2022-12-26
// Since this week doesn't contain Jan 4, it's 2022-W52
const result = getWeekInfo(dayjs("2023-01-01"), settings);
expect(result.weekYear).toBe(2022);
expect(result.weekNumber).toBe(52);
});
it("2023-01-02 should be 2023-W01 (first Monday)", () => {
const result = getWeekInfo(dayjs("2023-01-02"), settings);
expect(result.weekYear).toBe(2023);
expect(result.weekNumber).toBe(1);
});
});
describe("with firstWeekOfYear=2 (minimum days in first week)", () => {
// 2026-01-01 is Thursday
// The week containing Jan 1 starts on 2025-12-29 (Monday)
// This week has 4 days in 2026 (Thu, Fri, Sat, Sun = Jan 1-4)
describe("with minDaysInFirstWeek=1", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 2,
minDaysInFirstWeek: 1
};
it("2025-12-29 should be 2026-W01 (4 days >= 1 minimum)", () => {
// Week has 4 days in 2026, which is >= 1
const result = getWeekInfo(dayjs("2025-12-29"), settings);
expect(result.weekYear).toBe(2026);
expect(result.weekNumber).toBe(1);
});
it("2026-01-01 should be 2026-W01", () => {
const result = getWeekInfo(dayjs("2026-01-01"), settings);
expect(result.weekYear).toBe(2026);
expect(result.weekNumber).toBe(1);
});
});
describe("with minDaysInFirstWeek=7", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 2,
minDaysInFirstWeek: 7
};
it("2025-12-29 should be 2025-W52 (4 days < 7 minimum, so this is last week of 2025)", () => {
// Week has only 4 days in 2026, which is < 7
// So this week belongs to 2025
const result = getWeekInfo(dayjs("2025-12-29"), settings);
expect(result.weekYear).toBe(2025);
expect(result.weekNumber).toBe(52);
});
it("2026-01-01 should be 2025-W52 (still last week of 2025)", () => {
const result = getWeekInfo(dayjs("2026-01-01"), settings);
expect(result.weekYear).toBe(2025);
expect(result.weekNumber).toBe(52);
});
it("2026-01-05 should be 2026-W01 (first full week of 2026)", () => {
// 2026-01-05 is Monday, start of the first full week
const result = getWeekInfo(dayjs("2026-01-05"), settings);
expect(result.weekYear).toBe(2026);
expect(result.weekNumber).toBe(1);
});
});
});
});
describe("getFirstDayOfWeek1", () => {
it("with firstWeekOfYear=0, returns the first day of the week containing Jan 1", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 0,
minDaysInFirstWeek: 4
};
// 2026-01-01 is Thursday, so week starts on 2025-12-29
const result = getFirstDayOfWeek1(2026, settings);
expect(result.format("YYYY-MM-DD")).toBe("2025-12-29");
});
it("with firstWeekOfYear=1, returns the first day of the week containing Jan 4", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 1,
minDaysInFirstWeek: 4
};
// 2023-01-04 is Wednesday, so week starts on 2023-01-02
const result = getFirstDayOfWeek1(2023, settings);
expect(result.format("YYYY-MM-DD")).toBe("2023-01-02");
});
});
describe("getWeekString", () => {
it("generates correct week string for cross-year week", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 0,
minDaysInFirstWeek: 4
};
expect(getWeekString(dayjs("2025-12-29"), settings)).toBe("2026-W01");
});
it("generates correct week string with padded week number", () => {
const settings: WeekSettings = {
firstDayOfWeek: 1,
firstWeekOfYear: 0,
minDaysInFirstWeek: 4
};
expect(getWeekString(dayjs("2026-01-05"), settings)).toBe("2026-W02");
});
});
});