Add regression script for comparing previous calculation results

[mgramigna]

Summary

Adds scripts for comparing calculation results across ecqm-content repos. See additions to contributing.md for details on what exactly is happening.

New behavior

None in source code, new script exists.

Code changes

Le script. Update docs

Testing guidance

I've simulated an error on the simulated-regression-error branch, where for a given calculation, there is a 25% chance that it will incorrectly set numer/denom to true when IPP is false. If you run the script and get no failures at all, go buy a lottery ticket! To test:

1) git checkout simulated-regression-error 2) Run the following:

./regression/run-regression.sh -b add-regression-script

This will run regression with this PR's branch as the base, and the error branch as the "one under test." Conceptually this is simulating a scenario where you might be reviewing the code on simulated-regression-error and want to make sure that it didn't change any functionality from its base branch (in this case add-regression-script). In general the base branch will be master, but right now it won't work against master since the regression script isn't checked in there yet.

You should get some errors (this won't be idempotent since errors are random):

• There will be errors reported during comparison that says that the calculation results for two test cases for a measure are different:
• There will be a summary of all of the offending test cases at the end:

This indicates that calculation results differ across the branches

3. To get more info, use -v during the regression run which will print the diffs of the actual results (NOTE: the errors you get will be different than step 2 since it's random):

./regression/run-regression.sh -b add-regression-script -v

Diffs will be printed to the terminal in realtime:

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟢	Statements	85.39%	2023/2369
🟡	Branches	73.97%	1802/2436
🟢	Functions	87.5%	357/408
🟢	Lines	85.69%	1952/2278

Test suite run success

379 tests passing in 29 suites.

Report generated by 🧪jest coverage report action from 0d309b7179ef7f0079b89b7d2856b4e927635ffd