Timeout on appveyor

[unional]

In this code, when run on appveyor, "starting test" is printed but "ready to go" and "inside then" is never printed. Error is timeout. Event if I set timeout value to big number (30000) it still timeout.

It is running fine in travis.

describe(`app git tests`, () => {
  it.only('should use current and parent dir as repo name and org when it is not a git repo', () => {
    console.log('starting test');
    let generator;
    return helpers.run(path.join(__dirname, '../generators/app'))
      .withOptions({
        skipConfiguring: true,
        skipDefault: true,
        skipWriting: true,
        skipInstall: true,
        skipGit: true
      })
      .on('ready', (gen) => {
        console.log('ready to go');
        generator = gen;
      })
      .toPromise()
      .then((dir) => {
        console.log('inside then', dir);
        ...
      });
  });

Here is the code:
https://github.com/typings/generator-typings/blob/626482658015871764f6a0eeac5e75dbdc8d6973/test/git.spec.js

Here is test result:
https://ci.appveyor.com/project/unional/generator-typings/build/1.0.11

[github-actions]

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