Function setup

__tests__/prepare-release.test.ts:22–27

(changelog: string, version = '1.2.3')

}

function setup(changelog: string, version = '1.2.3') {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'prepare-release-'));
  fs.writeFileSync(path.join(dir, 'CHANGELOG.md'), changelog);
  fs.writeFileSync(path.join(dir, 'package.json'), JSON.stringify({ name: 'x', version }));
  return dir;
}

const HEADER = `# Changelog