Readings tests

[huss]

Description

This updates the test code to do:

• Separates testing functions as is coming in 3D code.
• Separates tests into separate files so run faster and easier to deal with.
• Place test ID in mocha.it description so easier to find it in the testing design doc.
• Place comments where newly documented tests will go. The hold is this will reduce merge conflicts.
• Fix bug where loading meters was changing the JSON object.

Type of change

• [ ] Note merging this changes the database configuration.
• [x] This change requires a documentation update

Checklist

• [x] I have followed the OED pull request ideas
• [x] I have removed text in ( ) from the issue request
• [x] You acknowledge that every person contributing to this work has signed the OED Contributing License Agreement and each author is listed in the Description section.

Limitations/Notes

• The documentation is already in the testing design document.
• More tests are coming but that should only add more placeholder comments to the code. If done before the review is finished then they will be added to this PR.

[huss]

I'm merging this code now for the following reasons:

• It is needed by developers who are beginning work on the test code.
• It should only impact the test code.
• It will still be reviewed and any issues will be addressed.
• The next OED release is still a ways off so this will not impact any production sites before review.

[sparakala21]

I tested all of the commands and looked at all the edited files. it seems pretty straightforward and seems to work well. I also looked at the design doc changes and My only thing is that now that the tests have been split up into categories it may make sense to split up their documentation into multiple markdown files.