typelevel/cats-effect

Most discussion is on Typelevel Discord: https://discord.gg/bSQBZA3Ced

James Phillips

@jdrphillips

Obviously this is not possible using Resource and the test framework directly. I figure it must have been solved by someone?

Paul Snively

@paul-snively

@jdrphillips: cats-effect-testing?

James Phillips

@jdrphillips

Is that the solution? I found it but assumed it was a random guy doing his own thing

I'll look more into it! Thanks

Michael Pilquist

@mpilquist

that random guy is the founder of cats-effect :)

James Phillips

@jdrphillips

hah

Probably legit then

Michael Pilquist

@mpilquist

Paul Snively

@paul-snively

I mean, he can be kind of random, I guess? ;-)

Fabio Labella

@SystemFw

also look at weaver

Paul Snively

@paul-snively

Right. If you can possibly change test frameworks: Weaver, MUnit's cats-effect module, Kallikrein...

Daniel Spiewak

@djspiewak

Okay thanks, there should be a rule, no documentation on the webpage, the feature doesn't exist :-)

Yes. This. 100%

I mean, he can be kind of random, I guess? ;-)

tbh I'm pretty random :-)

We're starting to see a trend towards tighter integration with functional effects in testing frameworks. Weaver was really the first one here, but munit and even scalacheck now have support (via external modules). I would expect the next version of Specs will be in a similar boat.

In a sense, cats-effect-testing is a short-term "catch all" shim that fills in the gaps for frameworks which haven't already added this kind of support

I'd like to see it disappear someday :-)

Paul Snively

@paul-snively

@djspiewak: Right now, I think it fills a crucial role in integrating with the major frameworks that are already in heavy use and tend to have painful backward-compatibility stories upon upgrading.

Someone says "We're using ScalaTest," and they (probably) won't have much pain using cats-effect-testing with it.

Daniel Spiewak

@djspiewak

that's the goal exactly!

I don't want people to have to use a separate testing framework to have a nice experience with IO and Cats Effect in general

also part of my motivation here is exceptionally selfish, since you can pry Specs2 from my cold, dead hands :-P

Paul Snively

@paul-snively

I recently used ScalaTest 3.2. It was an excruciating experience.

$DAYJOB settled on sbt-docker-compose and MUnit with the cats-effect module going forward.

Christopher Davenport

@ChristopherDavenport

Thank goodness for Daniel being the other dedicated specs2 person.

I was starting to feel alone.

Paul Snively

@paul-snively

"Committed... or should be," said the MacApp project t-shirt.

Daniel Spiewak

@djspiewak

lol

MUnit is legitimately impressive. It's definitely missing something that I like quite a lot about specs, but I've been impressed by what I've seen from it so far.

Ryan Peters

@sloshy

I would love to use munit or weaver at work. We're stuck on scalatest because all of our tests are written with matcher syntax

But on personal projects I've been pretty pleased with both

Gavin Bisesi

@Daenyth

@sloshy I bet you could make something that's source-compatible for your most-commonly-used matcher dsl invocations, but defers to munit

then swap the traits

Ryan Peters

@sloshy

I actually tried that. Did not go over as well as I hoped lol

It does add a bit of indirection in the complexity of it all. I think as a team the decision was, at a future date we can evaluate moving new projects to a different framework if it's deemed preferably by a majority of people

Gavin Bisesi

@Daenyth

hard to do that if no one gets a chance to use it. Oh well

Adam Rosien

@arosien

val longProcess = (IO.sleep(5.seconds) *> IO(println("Ping!"))).foreverM

val srv: Resource[IO, ServerBinding[IO]] = for {
  _ <- longProcess.background
  server <- server.run
} yield server

val application = srv.use(binding => IO(println("Bound to " + binding)) *> IO.never)

What's server.run ?

@WickedUk_gitlab where's that example from? looks like http4s.

do you mean what is the type of server.run? or what are the execution semantics when it happens "after" the background?

oh the snippet is from the scaladoc https://typelevel.org/cats-effect/api/cats/effect/Concurrent.html#background[A](fa:F[A]):cats.effect.Resource[F,F[A]]

Adam Rosien

@arosien

basically, it's really difficult to come up with examples that both illustrate the basic solutions (the point is to show background, but you're using background as the non-essential thing when looking from "the outside", which is about starting some server) and not confuse people with the details (server.run isn't defined in the snippet).

Gavin Bisesi

@Daenyth

Does anyone recall where the convo was yesterday(?) about clocks - realtime vs monotonic

Michael Pilquist

@mpilquist

cats-effect-dev

what’s up?

Gavin Bisesi

@Daenyth

adjusting my code and wanted to link to the convo in the commit ;)

Michael Pilquist

@mpilquist

Gavin Bisesi

@Daenyth

hmm... I still can't find it :|

oh well'

Daniel Spiewak

@djspiewak

it was about 20 km worth of scrollback ago

rnd4222

@rnd4222_gitlab

Its unfortunate that gitter history is not easily browsable/searchable, sometimes useful tips are only accessible via google-indexed search results

Steven Fines

@sfines-clgx

yeah, i've found that frustrating too

Daniel Spiewak

@djspiewak

hence why documentation needs to be better!

Gavin Bisesi

@Daenyth

I've been trying to ask my specific questions on github issues and link to the issue in chat

and likewise in projects I help maintain I file issues for questions, or encourage askers to copy their question to an issue

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