Add unit tests for utils and module pure functions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/unit/module/setChartData.test.js

@@ -0,0 +1,130 @@
+import { describe, it, expect } from 'vitest';
+import {
+  setLineChartData,
+  setBarChartData,
+  timeRange,
+  yTimeRange,
+  getXIndex,
+  formatTime,
+  formatMaxTwo,
+} from '@/module/setChartData.js';
+
+describe('timeRange', () => {
+  it('splits time into equal parts', () => {
+    const result = timeRange(0, 100, 3);
+    expect(result).toEqual([0, 50, 100]);
+  });
+
+  it('rounds values to integers', () => {
+    const result = timeRange(0, 10, 4);
+    // 0, 3.33, 6.67, 10 -> rounded
+    expect(result).toEqual([0, 3, 7, 10]);
+  });
+});
+
+describe('getXIndex', () => {
+  it('finds exact match index', () => {
+    expect(getXIndex([10, 20, 30], 20)).toBe(1);
+  });
+
+  it('finds closest value index', () => {
+    expect(getXIndex([10, 20, 30], 22)).toBe(1);
+  });
+
+  it('returns last matching index for equal distances', () => {
+    // 15 is equidistant from 10 and 20, <= means last wins
+    expect(getXIndex([10, 20, 30], 15)).toBe(1);
+  });
+});
+
+describe('formatTime', () => {
+  it('formats seconds only', () => {
+    expect(formatTime(45)).toBe('45s');
+  });
+
+  it('formats minutes and seconds', () => {
+    expect(formatTime(125)).toBe('2m5s');
+  });
+
+  it('formats hours, minutes, seconds', () => {
+    expect(formatTime(3661)).toBe('1h1m1s');
+  });
+
+  it('formats days', () => {
+    expect(formatTime(90061)).toBe('1d1h1m1s');
+  });
+
+  it('returns null for NaN', () => {
+    expect(formatTime('abc')).toBeNull();
+  });
+
+  it('handles zero seconds', () => {
+    expect(formatTime(0)).toBe('0s');
+  });
+});
+
+describe('formatMaxTwo', () => {
+  it('keeps only top two units', () => {
+    expect(formatMaxTwo(['1d2h3m4s'])).toEqual(['1d 2h']);
+  });
+
+  it('keeps single unit as-is', () => {
+    expect(formatMaxTwo(['45s'])).toEqual(['45s']);
+  });
+
+  it('handles two units', () => {
+    expect(formatMaxTwo(['3m20s'])).toEqual(['3m 20s']);
+  });
+
+  it('processes multiple items', () => {
+    expect(formatMaxTwo(['1h30m10s', '45s']))
+      .toEqual(['1h 30m', '45s']);
+  });
+});
+
+describe('setLineChartData', () => {
+  it('prepends min and appends max to data', () => {
+    const baseData = [
+      { x: 1, y: 10 }, { x: 2, y: 20 },
+      { x: 3, y: 30 }, { x: 4, y: 40 },
+      { x: 5, y: 50 }, { x: 6, y: 60 },
+      { x: 7, y: 70 }, { x: 8, y: 80 },
+      { x: 9, y: 90 }, { x: 10, y: 100 },
+    ];
+    const result = setLineChartData(
+      baseData, 'xMax', 'xMin', false, 200, 0
+    );
+    // Should have 12 elements (10 original + 2 boundary)
+    expect(result).toHaveLength(12);
+    expect(result[0].x).toBe('xMin');
+    expect(result[11].x).toBe('xMax');
+  });
+
+  it('clamps percent values between 0 and 1', () => {
+    const baseData = [
+      { x: 1, y: 0.1 }, { x: 2, y: 0.2 },
+      { x: 3, y: 0.3 }, { x: 4, y: 0.4 },
+      { x: 5, y: 0.5 }, { x: 6, y: 0.6 },
+      { x: 7, y: 0.7 }, { x: 8, y: 0.8 },
+      { x: 9, y: 0.9 }, { x: 10, y: 0.95 },
+    ];
+    const result = setLineChartData(
+      baseData, 'xMax', 'xMin', true, 1, 0
+    );
+    expect(result[0].y).toBeGreaterThanOrEqual(0);
+    expect(result[0].y).toBeLessThanOrEqual(1);
+    expect(result[11].y).toBeGreaterThanOrEqual(0);
+    expect(result[11].y).toBeLessThanOrEqual(1);
+  });
+});
+
+describe('setBarChartData', () => {
+  it('converts x values to formatted date strings', () => {
+    const baseData = [
+      { x: '2023-01-15T12:00:00', y: 100 },
+    ];
+    const result = setBarChartData(baseData);
+    expect(result[0].y).toBe(100);
+    expect(result[0].x).toMatch(/2023\/1\/15/);
+  });
+});