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test: add unit tests for streak calculation functions #2821

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18 changes: 14 additions & 4 deletions test/streak.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,7 @@ afterEach(() => {

describe("calculateStreakFromDates", () => {
it("returns zeros for empty active dates", () => {
const result = calculateStreakFromDates(new Set());
const result = calculateStreakFromDates(new Set(), new Set(), "UTC");
expect(result.current).toBe(0);
expect(result.longest).toBe(0);
expect(result.lastCommitDate).toBeNull();
Expand Down Expand Up @@ -79,6 +79,15 @@ describe("calculateStreakFromDates", () => {
expect(result.longest).toBe(3); // freeze fills the gap making longest = 3
expect(result.totalActiveDays).toBe(3);
expect(result.freezeDates).toEqual(["2026-06-22"]);

});
it("streak is alive when timezone is Asia/Kolkata and last date is today", () => {
// FIXED_NOW = 2026-06-24T12:00:00Z = 2026-06-24 17:30 IST
// Both UTC and IST resolve to same date here, so current streak should be 1
const dates = new Set(["2026-06-24"]);
const result = calculateStreakFromDates(dates, new Set(), "Asia/Kolkata");
expect(result.current).toBe(1);
expect(result.longest).toBe(1);
});

it("current is 0 when last active day is older than yesterday", () => {
Expand All @@ -96,9 +105,10 @@ describe("calculateCurrentStreak", () => {
});

it("accepts an array of ISO timestamp strings and deduplicates", () => {
const dates = ["2026-06-23T10:00:00Z", "2026-06-23T20:00:00Z", "2026-06-22T08:00:00Z"];
const result = calculateCurrentStreak(dates);
expect(result).toBe(2);
// 2 timestamps on same date (2026-06-23) → slice(0,10) deduplicates → only 2 unique days
const dates = ["2026-06-23T10:00:00Z", "2026-06-23T20:00:00Z", "2026-06-22T08:00:00Z"];
const result = calculateCurrentStreak(dates);
expect(result).toBe(2);
});

it("returns 0 for an empty array", () => {
Expand Down
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