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Darius Kazemi

Normally I'm not a stickler for 100% test coverage but...... this is a stdlib in Ruby? The programming language?

13 comments
duncan, lord of hell

@darius *looks at the pile of bugs we've had to fix in our own application that ended up being because of ruby timezone bullshit*: yea, that makes sense

SportsPuck Appreciation Stel

@darius timezones! Who needs 'em? 🙃

[I don't always test but when I do I test in production.jpg]

Darius Kazemi

Oh well, another day, another data point in favor of "the fact that computers run at all is a miracle"

Darius Kazemi

Wait I stand corrected! There are some tests, they are in Time and not DateTime. But also the ruby docs point out that there are actual differences between the two if you are calculating historical time

github.com/ruby/ruby/blob/d92f

Darius Kazemi

So I guess the most correct thing to say is that there is no test coverage for historical time in Ruby (this matters because time zones change over time so if you are trying to make accurate comparison across years and especially decades this will come into play)

Ryuno-Ki

@darius
Do you have a concrete example that kicked this research of for you?

When you study Ruby's code, perhaps use git blame to check for last change and jump from the commit to a PR to gather more context. Might have a good reason why they didn't invest more effort into this part of the codebase.

Darius Kazemi replied to Ryuno-Ki

@RyunoKi the history of basically all the tests are all clobbered by this commit -- it seems like they haven't really been touched in well over 5 years, I'd have to go back to some previous repository in order to find relevant commits

clarity flowers

@darius @RyunoKi using NodaTime (the library used as a reference in this post) completely changed my perspective on working with datetimes and also now makes me very angry about every language's datetime stdlib which all seemed designed to maximize footguns.

The end result is programmers learn "datetimes are scary" instead of "this stdlib sucks"

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