mosaic/packages/quality-rails/tests/detect.test.ts

import { mkdtemp, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

import { describe, expect, it } from 'vitest';

import { detectProjectKind } from '../src/detect.js';

async function withTempDir(run: (directory: string) => Promise<void>): Promise<void> {
  const directory = await mkdtemp(join(tmpdir(), 'quality-rails-detect-'));
  try {
    await run(directory);
  } finally {
    await rm(directory, { recursive: true, force: true });
  }
}

describe('detectProjectKind', () => {
  it('returns node when package.json exists', async () => {
    await withTempDir(async (directory) => {
      await writeFile(join(directory, 'package.json'), '{"name":"fixture"}\n', 'utf8');

      await expect(detectProjectKind(directory)).resolves.toBe('node');
    });
  });

  it('returns python when pyproject.toml exists and package.json does not', async () => {
    await withTempDir(async (directory) => {
      await writeFile(join(directory, 'pyproject.toml'), '[project]\nname = "fixture"\n', 'utf8');

      await expect(detectProjectKind(directory)).resolves.toBe('python');
    });
  });

  it('returns unknown when no known project files exist', async () => {
    await withTempDir(async (directory) => {
      await expect(detectProjectKind(directory)).resolves.toBe('unknown');
    });
  });
});