[TIP] Coverage.py 5.0 beta 1

Ned Batchelder ned at nedbatchelder.com
Tue Nov 12 07:39:46 PST 2019

PS: retweeting this to get more people trying it wouldn't be bad either: 

Thanks! :)

On 11/12/19 10:29 AM, Ned Batchelder wrote:
> I just released coverage.py 5.0 beta 1. It has some big changes since 
> 4.5.x, so I need people to try it and tell me if it’s ready. Please 
> install coverage.py 5.0 beta 1 
> <https://pypi.org/project/coverage/5.0b1/> and try it in your environment.
> I especially want to hear from you if you tried the earlier alphas of 
> 5.0. There have been some changes in the SQLite database that were 
> needed to make measurement efficient enough for large test suites, but 
> that hinder ad-hoc querying.
> If you haven’t taken a look at coverage.py 5.0 yet, the big change is 
> the addition of “contexts.” These can record not just that a line was 
> executed, but something about why it was executed. Any number of 
> contexts can be recorded for a line. They could be different operating 
> systems, or versions of Python, or the name of the test that was 
> running. I think it could enable some really interesting tooling.
> If you are interested in recording test names as contexts, the 
> pytest-cov <https://pypi.org/project/pytest-cov/> pytest plugin now 
> has a “--cov-context” option to do just that.
> Contexts increase the data requirements, so data storage is now a 
> SQLite file rather than a JSON file. The summary of what’s new in 5.0 
> is here: Major changes in 5.0 
> <https://coverage.readthedocs.io/en/latest/whatsnew5x.html>.
> Please try this. Soon 5.0 will be done, and people will begin 
> installing it unknowingly. I would really like to minimize the turmoil 
> when that happens.
> Thanks,
> --Ned.
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