# Plan 05-02: Tests for Polish Features

**Phase:** 5 — Polish
**Requirements:** POLI-01, POLI-02, POLI-03 (test coverage)
**Estimated tasks:** 3

## Goal

Add Vitest tests for streak calculation, summary stats, weekend styling, and week start configurability.

## Tasks

### Task 1: Streak calculation tests

**File:** `assets/test/stats.test.ts` (new)
**Tests:**
- Streak of 3 consecutive days ending today → returns 3
- Gap in the middle breaks streak → returns days after gap
- No entries today but entries yesterday → streak counts from yesterday
- No entries at all → returns 0
- Single day entry (today) → returns 1

### Task 2: Summary stats tests

**File:** `assets/test/stats.test.ts` (same file)
**Tests:**
- Total hours sums correctly
- Average hours divides by days-with-entries (not total calendar days)
- Busiest day picks the max-hours entry
- Empty data returns zeroes and null busiest day

### Task 3: Weekend and week start rendering tests

**File:** `assets/test/heatmap.test.ts` (extend existing)
**Tests:**
- Weekend cells (Sat/Sun) have `heatmap-weekend` class
- Weekday cells do NOT have `heatmap-weekend` class
- Stats row renders below heatmap with streak and stat values

## Verification

- `npm test` passes all new and existing tests

## Commit

`test: add tests for streak, stats, weekend styling`