Vue properties test WIP

[shilman]

Issue: #9838

What I did (w/ @pocka)

1. Adapted the test setup from https://github.com/pocka/vue-docgen-loader/blob/master/test/compiler.js

Error: warn: Unhandled rejection TypeError: setTimeout(...).unref is not a function

2. Based on TypeError: timer.unref is not a function jestjs/jest#1909 , tried creating a addons/docs/jest.config.js with:

module.exports = {
  testEnvironment: 'node',
};

But got the error:

    Could not locate module babel-runtime/core-js/get-iterator mapped as:
    core-js/es/get-iterator.

    Please check your configuration for these entries:
    {
      "moduleNameMapper": {
        "/babel-runtime\/core-js\/(.*)/": "core-js/es/$1"
      },
      "resolver": undefined
    }

3. Based on Cannot find module 'babel-runtime/core-js/get-iterator' in Electron build miaolz123/vue-markdown#18 , tried adding babel-runtime as a devDependency. But the error persists.

How to test

Doesn't currently work:

yarn jest --testPathPattern=vue-properties.test.ts --watch

[github-actions]

	Fails
🚫	PR is not labeled with one of: ["cleanup","doc-dependencies:update","BREAKING CHANGE","feature request","bug","documentation","maintenance","dependencies:update","dependencies","other"]

Generated by 🚫 dangerJS against b5a448d

[Aaron-Pool]

Still hoping to look at this, but I'm wrapping up a sprint at work and then I'm out of town till Saturday, so it could be a few days 😕

[Aaron-Pool]

@shilman I finally got around to trying to dig in to this, but I'm having some troubles bootstrapping the branch in general. Does this need to be merged to master or anything? I'm definitely running latest of both node and yarn (which has been my problem in the past).

[shilman]

@Aaron-Pool I updated the branch from next and resolved conflicts. yarn bootstrap --core is working for me. Try again? Thanks!!!