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tests/scaleDataProcessor.test.ts

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+import { describe, expect, it } from 'vitest';
+import { calculateDailyWeightGain, processDailyWeightData } from '../utils/scaleDataProcessor.ts';
+import { ScalePredictionRangeResponse } from '../types.ts';
+
+describe('scaleDataProcessor', () => {
+  it('derives day labels from the cycle date and skips points beyond totalDays', () => {
+    const cycleStartDate = new Date('2026-05-22T00:00:00');
+
+    const scaleData: ScalePredictionRangeResponse = {
+      success: true,
+      data: [
+        {
+          date: '2026-05-22',
+          items: [
+            {
+              id: 'p1',
+              cage_name: 'Kandang A',
+              age: 1,
+              total_weight_prediction: 0,
+              total_weight_actual: 500,
+              avg_weight_prediction: 0,
+              avg_weight_actual: 50,
+              chicken_count: 10,
+              captured_at: '2026-05-22T00:00:00Z',
+              image_url: '',
+              device: 'dev-1',
+            },
+          ],
+        },
+        {
+          date: '2026-05-23',
+          items: [
+            {
+              id: 'p2',
+              cage_name: 'Kandang A',
+              age: 99,
+              total_weight_prediction: 0,
+              total_weight_actual: 600,
+              avg_weight_prediction: 0,
+              avg_weight_actual: 60,
+              chicken_count: 10,
+              captured_at: '2026-05-23T00:00:00Z',
+              image_url: '',
+              device: 'dev-1',
+            },
+          ],
+        },
+        {
+          date: '2026-07-11',
+          items: [
+            {
+              id: 'p3',
+              cage_name: 'Kandang A',
+              age: 51,
+              total_weight_prediction: 0,
+              total_weight_actual: 1200,
+              avg_weight_prediction: 0,
+              avg_weight_actual: 120,
+              chicken_count: 10,
+              captured_at: '2026-07-11T00:00:00Z',
+              image_url: '',
+              device: 'dev-1',
+            },
+          ],
+        },
+      ],
+    };
+    const dailyWeight = processDailyWeightData(scaleData, cycleStartDate, 42);
+
+    expect(dailyWeight).toHaveLength(2);
+    expect(dailyWeight.map((point) => point.day)).toEqual([1, 2]);
+    expect(dailyWeight.find((point) => point.day === 2)?.date).toBe('2026-05-23');
+
+    const dailyGain = calculateDailyWeightGain(dailyWeight);
+    expect(dailyGain).toHaveLength(1);
+    expect(dailyGain[0]).toMatchObject({
+      day: 2,
+      gain: 10,
+      date: '2026-05-23',
+    });
+  });
+});