feat: add reminder source (#126)

packages/freya-source-reminders/src/recurrence.test.ts

@@ -0,0 +1,68 @@
+import { describe, expect, test } from "bun:test"
+
+import type { Reminder } from "./types.ts"
+
+import { expandReminderOriginalDueAts, findReminderOccurrenceIndex } from "./recurrence.ts"
+import { ReminderPriority, ReminderRecurrenceFrequency, ReminderWeekday } from "./types.ts"
+
+describe("recurrence", () => {
+	test("deduplicates weekly weekdays before applying recurrence count", () => {
+		const reminder = weeklyReminder({
+			recurrence: {
+				frequency: ReminderRecurrenceFrequency.Weekly,
+				interval: 1,
+				weekdays: [ReminderWeekday.Monday, ReminderWeekday.Monday, ReminderWeekday.Wednesday],
+				count: 3,
+			},
+		})
+
+		const originalDueAts = expandReminderOriginalDueAts(
+			reminder,
+			new Date("2026-06-08T00:00:00Z"),
+			new Date("2026-06-22T00:00:00Z"),
+		)
+
+		expect(originalDueAts.map(toIsoString)).toEqual([
+			"2026-06-08T09:00:00.000Z",
+			"2026-06-10T09:00:00.000Z",
+			"2026-06-15T09:00:00.000Z",
+		])
+	})
+
+	test("deduplicates weekly weekdays before calculating occurrence indexes", () => {
+		const reminder = weeklyReminder({
+			recurrence: {
+				frequency: ReminderRecurrenceFrequency.Weekly,
+				interval: 1,
+				weekdays: [ReminderWeekday.Monday, ReminderWeekday.Monday, ReminderWeekday.Wednesday],
+			},
+		})
+
+		expect(findReminderOccurrenceIndex(reminder, new Date("2026-06-10T09:00:00Z"))).toBe(1)
+		expect(findReminderOccurrenceIndex(reminder, new Date("2026-06-15T09:00:00Z"))).toBe(2)
+	})
+})
+
+function weeklyReminder(overrides: Partial<Reminder> = {}): Reminder {
+	const now = new Date("2026-06-01T00:00:00Z")
+	return {
+		id: "r1",
+		title: "Take vitamins",
+		notes: null,
+		dueAt: new Date("2026-06-08T09:00:00Z"),
+		timeZone: "UTC",
+		recurrence: {
+			frequency: ReminderRecurrenceFrequency.Weekly,
+			interval: 1,
+			weekdays: [ReminderWeekday.Monday],
+		},
+		priority: ReminderPriority.Normal,
+		createdAt: now,
+		updatedAt: now,
+		...overrides,
+	}
+}
+
+function toIsoString(date: Date): string {
+	return date.toISOString()
+}