markdown-parser.test.ts

import { describe, expect, it } from 'vitest';
import { getMdxSource, parseHeadingsFromMdx } from './markdown-parser';

describe('parseHeadingsFromMdx', () => {
  it('parses headings and keeps duplicate ids unique', () => {
    const mdx = `
## Redis 개요
### 성능 포인트
## Redis 개요
`;

    const headings = parseHeadingsFromMdx(mdx);

    expect(headings).toHaveLength(3);
    expect(headings[0]).toEqual({
      id: 'redis-개요',
      text: 'Redis 개요',
      level: 2,
    });
    expect(headings[1]).toEqual({
      id: '성능-포인트',
      text: '성능 포인트',
      level: 3,
    });
    expect(headings[2]).toEqual({
      id: 'redis-개요-1',
      text: 'Redis 개요',
      level: 2,
    });
  });

  it('normalizes markdown-heavy headings and skips non-renderable cases', () => {
    const mdx = `
### **🚀 성능 증명 (로컬 벤치마크)**
### [Redis](https://redis.io) \`Pipeline\`
### **🎯**
\`\`\`md
## code block heading
\`\`\`
### **🚀 성능 증명 (로컬 벤치마크)**
`;

    const headings = parseHeadingsFromMdx(mdx);

    expect(headings).toEqual([
      {
        id: '성능-증명-로컬-벤치마크',
        text: '🚀 성능 증명 (로컬 벤치마크)',
        level: 3,
      },
      {
        id: 'redis-pipeline',
        text: 'Redis Pipeline',
        level: 3,
      },
      {
        id: '성능-증명-로컬-벤치마크-1',
        text: '🚀 성능 증명 (로컬 벤치마크)',
        level: 3,
      },
    ]);
  });

  it('returns an empty array for invalid content', () => {
    expect(parseHeadingsFromMdx('')).toEqual([]);
  });
});

describe('getMdxSource', () => {
  it('returns markdown source for an existing slug', () => {
    const source = getMdxSource('redis-deep-dive-02-core-data-types');

    expect(typeof source).toBe('string');
    expect(source).toContain('#');
  });

  it('returns null when source cannot be loaded', () => {
    const source = getMdxSource('does-not-exist-post');

    expect(source).toBeNull();
  });
});