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utils/__tests__/kandangRanking.test.ts

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+import { describe, expect, it } from 'vitest';
+import type { KPI } from '../../types/api.ts';
+import {
+  isEndDateInWindow,
+  latestValidRatios,
+  rankingWindowStart,
+} from '../kandangRanking.ts';
+
+function kpi(partial: Partial<KPI>): KPI {
+  return {
+    id: 1,
+    cycle: 1,
+    kandang: 1,
+    flock_id: 1,
+    date: '2026-01-01',
+    age: 1,
+    mortality: 0,
+    mortality_total: 0,
+    feed: 0,
+    feed_total: 0,
+    harvest: 0,
+    harvest_total: 0,
+    harvest_weight: 0,
+    harvest_weight_total: 0,
+    chicken_life: 1000,
+    chicken_life_percentage: 100,
+    iot_weight: 0,
+    average_harvest_day: 0,
+    average_harvest_weight: 0,
+    fcr: 0,
+    eef: 0,
+    cc: 0,
+    cw: 0,
+    fs: 0,
+    manual: 0,
+    created_at: '',
+    updated_at: '',
+    ...partial,
+  };
+}
+
+describe('kandangRanking helpers', () => {
+  it('rankingWindowStart subtracts calendar months', () => {
+    expect(rankingWindowStart(3, new Date(2026, 8, 8))).toBe('2026-06-08');
+    expect(rankingWindowStart(1, new Date(2026, 0, 31))).toBe('2025-12-31');
+  });
+
+  it('isEndDateInWindow is inclusive on the lower bound', () => {
+    expect(isEndDateInWindow('2026-06-08', '2026-06-08')).toBe(true);
+    expect(isEndDateInWindow('2026-06-07', '2026-06-08')).toBe(false);
+    expect(isEndDateInWindow(null, '2026-06-08')).toBe(false);
+  });
+
+  it('latestValidRatios takes last positive EEF by age, not array order', () => {
+    // API-style newest-first ordering
+    const rows = [
+      kpi({ date: '2026-01-03', age: 3, eef: 310, fcr: 1.25 }),
+      kpi({ date: '2026-01-02', age: 2, eef: 0, fcr: 1.3 }),
+      kpi({ date: '2026-01-01', age: 1, eef: 200, fcr: 1.4 }),
+    ];
+    expect(latestValidRatios(rows)).toEqual({ eef: 310, fcr: 1.25 });
+  });
+
+  it('latestValidRatios finds FCR and EEF independently from latest days', () => {
+    const rows = [
+      kpi({ date: '2026-01-03', age: 3, eef: 320, fcr: 0 }),
+      kpi({ date: '2026-01-02', age: 2, eef: 0, fcr: 1.22 }),
+      kpi({ date: '2026-01-01', age: 1, eef: 100, fcr: 1.5 }),
+    ];
+    expect(latestValidRatios(rows)).toEqual({ eef: 320, fcr: 1.22 });
+  });
+
+  it('latestValidRatios returns null EEF when none valid', () => {
+    const rows = [kpi({ age: 2, eef: 0, fcr: 1.2 }), kpi({ age: 1, eef: 0, fcr: 0 })];
+    expect(latestValidRatios(rows)).toEqual({ eef: null, fcr: 1.2 });
+  });
+});