code: function tryBindPath(serverless, bindPath, testFile) {
    const options = [
      'run',
      '--rm',
      '-v',
      `${bindPath}:/test`,
      'alpine',
      'ls',
      `/test/${testFile}`
    ];
    try {
      const ps = dockerCommand(options);
      if (process.env.SLS_DEBUG) {
        serverless.cli.log(`Trying bindPath ${bindPath} (${options})`);
        serverless.cli.log(ps.stdout.trim());
      }
      return ps.stdout.trim() === `/test/${testFile}`;
    } catch (err) {
      return false;
    }
  }
docs: Test bind path to make sure it's working
  @param {string} bindPath
  @return {boolean}