Function withFixtureAppdata

test/evolveCollect.test.js:985–993

(home, fn)

  // non-existent paths and get filtered out by fs.existsSync. POSIX hosts
  // are unaffected (resolveTranscriptDirs does not run the win32 branch).
  function withFixtureAppdata(home, fn) {
    const saved = process.env.APPDATA;
    process.env.APPDATA = path.join(home, 'AppData', 'Roaming');
    try { return fn(); }
    finally {
      if (saved === undefined) delete process.env.APPDATA;
      else process.env.APPDATA = saved;
    }
  }

  // Spawn a child node process with a pinned HOME so `os.homedir()`
  // resolves to the fixture. The reader's module-level constants