color-name-list/tests/sorting.test.js

long list of color names

import { describe, it, expect, beforeAll } from 'vitest';
import { csvTestData } from './csv-test-data.js';

/**
 * Ensures that the source CSV file is already sorted alphabetically (case-insensitive)
 * by the color name. If not, it throws with a helpful message telling how to fix it.
 */
describe('Source CSV sorting', () => {
  beforeAll(() => {
    // Load CSV data once
    csvTestData.load();
  });

  it('colornames.csv should be sorted by name (case-insensitive)', () => {
    expect(csvTestData.lineCount).toBeGreaterThan(1);

    const entries = csvTestData.lines
      .filter((l) => l.trim().length)
      .map((l, idx) => {
        const [name, hex] = l.split(',');
        return { originalIndex: idx + 2, line: l, name, lower: name.toLowerCase(), hex };
      });

    for (let i = 1; i < entries.length; i++) {
      const prev = entries[i - 1];
      const curr = entries[i];
      if (prev.lower.localeCompare(curr.lower) > 0) {
        throw new Error(
          [
            'Source file src/colornames.csv is not sorted alphabetically by name.',
            `Out of order around lines ${prev.originalIndex} -> ${curr.originalIndex}:`,
            `  "${prev.name}" should come AFTER "${curr.name}"`,
            '',
            'To fix automatically run:',
            '  npm run sort-colors',
            '',
            'Commit the updated src/colornames.csv after sorting.',
          ].join('\n')
        );
      }
    }
  });
});