This reimplements the idea @bkdotcom came up with in #1519, and took a stab at in #1525. It’s a really powerful way to add all sorts of custom badges, particularly considering [tools like RunKit endpoints and Jupyter Kernel Gateway](https://github.com/badges/shields/issues/2259#issuecomment-444186589), not to mention all the other ways cloud functions can be deployed these days.
In #2698 we decided to put legacy helper functions in `core/legacy`. I think that’s a fine idea, though if we’re going to have a bunch of badge helper functions in there, it seems like it is probably better to keep these two important but esoteric helper functions with the core code to which they are most coupled. So I added `legacy-` to the name, and put them in `core/base-service`.
Continue to implement #2698:
- Add `core/base-service/index.js` (but hold off on moving the things it imports)
- Add shortcuts in `services/index.js` for Base*Service, errors, and deprecatedService. This file will be streamlined later to avoid cluttering it with rarely used bits.
- Apply consistent ordering of imports and use of `module.exports` in testers.
- Remove some renaming of imports.
- Remove obsolete tests here and there.
This test is being weirdly flaky in #2809. The problem seems to be in the test helper code, so I rewrote this using Joi.
I imagine the change has to do with a change to the test ordering. It's a bit puzzling.
However, the new test seems fine (and the endpoint is rarely used; not critical to begin with).
It’s happened twice that `[*]` has ended up in a PR title and the full test run has happened inadvertently. Once was me and once was a new contributor.
This raises the bar on doing it accidentally.
