Remove unused Coveralls

[MattiSG]

Hi there!

I really enjoy OpenFisca, but I recently encountered an issue.

Here is what I did:

• Submit a PR from a third-party organisation.

Here is what I expected to happen:

• CI passes.

Here is what actually happened:

• CI fails on sending data to coveralls.io.

Here is data (or links to it) that can help you reproduce this issue:

https://github.com/openfisca/openfisca-core/pull/1070#issuecomment-945785704

Context

I identify more as a:

• Maintainer.

• ---

Coverage data storage was introduced by @maukoquiroga in b785382722eeb72b8cc72f18cb0942e0b6424c1e. It does not seem to be used by anyone in the build / release process, and a quick question on Slack did not yield any other reply. I am in favour of removing coveralls.io altogether, which I suggest to do unless someone chimes in within 4 days to say they use it, with a fast removal if @maukoquiroga confirms it can be removed.

The alternative would be to not execute the Coveralls CI job on third-party PRs.

[MattiSG]

The data seems to show that coverage went down from 76% to 54% on 30th of September 2021. Investigating the origin of that change is not obvious.

Based on time match, it seems the origin would be #1046, which among other things removed the --capture flag in test_runner.py.

In my opinion, the fact that such a sharp drop in coverage did not trigger any investigation tends to demonstrate this data is not used by anyone. I understand the cost of continuing to store it is low, and it might make sense to keep it since we have data dating back from March 2015, but it would then need to be actually integrated in a quality management agreement.

[MattiSG]

Data collection doesn't seem reliable: https://github.com/openfisca/openfisca-core/pull/1057#issuecomment-950595085

[bonjourmauko]

Hello @MattiSG , I do personally do not care about the history, but I do care about coverage.

In my opinion, the fact that such a sharp drop in coverage did not trigger any investigation tends to demonstrate this data is not used by anyone.

I do, but coverage is rather useless as a socio-technical mechanism unless there is a policy enforced programatically.

Concerning data collection, I proposed in #1059 what I think is the way it should be done.

Concerning Coveralls itself, as a service, we can remove it 😃

[bonjourmauko]

Just to complement my previous comment:

1. We can remove the service Coveralls
2. I'll propose a PR to fix the coverage issue —thanks for reporting it!

[bonjourmauko]

Thanks to this issue, I discovered that doctests are not being run 🤯