Fix (and add) yarn rw test web in run-e2e script

[thedavidprice]

related to #1886

@peterp @dac09

We are currently not able to run yarn rw test web in our CI check due to undiagnosed issues from the package linking process. I'm still tracking and including a manual QA check for yarn rw test web, however, it feels like it's bound to get missed sooner or later. What should the next steps be here:

• diagnose and try to resolve via a change to package linking?
• implement a different process for including yarn rw test in our CI process?
• ... ?

Example Jest failure message:

 FAIL   web  web/src/components/BlogPostsCell/BlogPostsCell.test.js
  ● Test suite failed to run

    Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    /private/var/folders/gj/_y54h7q11mz9rwnhn16h6yrr0000gn/T/redwood-e2e/2021-03-23T15-48-36.323Z/packages/structure/dist/model/RWCell.js:3
    import { withCell } from "@redwoodjs/web";
    ^^^^^^

    SyntaxError: Cannot use import statement outside a module

      33 | var _URL = require("../x/URL");
      34 |
    > 35 | var _RWCell = require("./RWCell");
         |               ^
      36 |
      37 | var _RWComponent = require("./RWComponent");
      38 |

      at Runtime.createScriptFromCode (../node_modules/jest-runtime/build/index.js:1350:14)
      at Object.<anonymous> (../packages/structure/dist/model/RWProject.js:35:15)

How to Replicate

The error above came from an E2E run. However, I believe you can reproduce this on any project where you are using yarn rwt link ...

[peterp]

I was trying to debug this issue: #2039

What I found was that if you ran yarn rw test in e2e with the redwood/packages in the repository it didn't work, but if you ran yarn jest it did work.

I'm assuming there's a problem with paths, that jest doesn't know where it's starting from... Or "jest" is picking up tests or trying to do coverage in the redwood/packages folder.

[thedavidprice]

bumping this on — likely too late for v0.29 but high priority when possible to dig in. I'm weak on the fundamentals here but game to dig in given direction.