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Spec-me-maybe: Introduces the “maybe” syntax to RSpec (github.com/davidcelis)
99 points by speric on Sept 26, 2014 | hide | past | favorite | 37 comments



I find it quite funny that people cannot tell whether this is a joke or not, just says something about the state of things...


If people don't get it we should maybe just retry it.


We could fail. Or not.


maybe(joke).will be_success


It does. Especially considering the fact that RSpec itself was created as a joke solution to the "I wish my tests were more human readable" meme several years ago. Hopefully that sheds some light on why some of us might be hyper-sensitive about it.


That's not quite true.

I created RSpec (in early 2005) to draw people's attention away from the word "test" because it was a huge hangup while I was teaching TDD. I kept hearing "You can't test something that doesn't exist, therefore your entire idea is bunk." I wanted to introduce TDD to people without ever using the word "test", and then switch them to using xUnit instead.

Not a joke, but I guess you could reasonably describe RSpec as a tool for performing a good old fashioned bait and switch. In a classroom. (I never intended for it to be used outside of a classroom setting.)

Around the time I was looking for ways to "teach TDD without using the word", Aslak Hellesøy introduced me to Dan North's ideas of Behaviour Driven Development. That's where the word "should" came from. I don't know if it was actually Aslak or Dan (or possibly even Liz Keogh) that first used the word "should", but that wasn't my idea.

Also, I'll point out that mixing #should onto Object wasn't my fault. The original syntax looked very close to the expect().to() syntax of today. It was actually assert(foo).does_equal(bar) at one point, and this was the syntax I was most fond of. I tried dozens of different combinations. "#should" was one of many, and I didn't like it. It got released this way because I was talked into it after that variant was demonstrated (by someone else) to a positive audience.

People liked it. RSpec took off. Whoops.

I later said on twitter, jokingly, that RSpec was a huge troll. That was kind of a joke on a joke. RSpec wasn't a joke, but I didn't build it for actual use. That was a happy accident. That said, it's a great tool these days, if a bit heavy. And it has certainly served my original wish of teaching many people TDD very well.

My $0.02 on the "maybe" syntax: if you need this, I suspect your problems are a lot larger than whether or not an assertion will pass or fail. It's symptom solving.


Thank you for this. It's nice to have it straight from the horses mouth instead of the many different types of RSpec folklore I've heard about its origin.


Author of spec-me-maybe here. My $0.02 cents on the "maybe" syntax would be please don't actually use it.


Thanks Steven.


I'd like to thank Jesse Cooke for pointing me at this. The history of RSpec is something that's often misunderstood by many folks.


My pleasure ;) I'll go update the wiki.

Updated: https://github.com/rspec/rspec/wiki/Background


It does; considering situations where this would be seen as a realistic/novel approach for fixing flapping tests. No need to examine root cause! sigh


While this is obviously a joke, I can see it having a limited amount of practical value. Imagine, for example, being tasked with updating a poorly-maintained legacy code base with a large number of indeterminately failing specs containing order dependencies. You could `RSpec::Maybe` everything until you're sure you have the order dependencies resolved, then convert to regular `RSpec::Expectation`s.


That's the usecase of `pending`


pending might as well not be there.

how many maybes passed could be useful information - perhaps 80% is good enough to be confident it works, but if it's 20% something's gone wrong


Pending is really useful: it can also tell you if a test that you expected to be passing is now failing. It's also useful for hiding output for tests that are temporarily failing, until you fix them all.

I'll often spec out a whole behavior, with ten or fifteen tests, and then mark all but one pending, make that one pass, unmark another one, make that pass, unmark another... it's easier to focus on just the one you're working on rather than 19 other failing outputs.

Committing a pending test? yeah, that's bad.


Love the build status badge. Nice touch.


Everything should also take `.maybe.it_wont` at the end, for completeness.


seems legit. i'll take a look at it, maybe


I can see wondering if this was a joke as 'maybe' is mildly reminiscent of promise[1] and the like but if you got to .on_my_machine and still couldn't figure it out, you got some 'splainin to do. :)

[1] http://blogs.msdn.com/b/ie/archive/2011/09/11/asynchronous-p...


There's also the Maybe monad, which is a good substitute for null.


This may be a joke, but there are valid scenarios for this sort of thing, which is why rspec has pending and skipped tests:

https://relishapp.com/rspec/rspec-core/v/3-1/docs/pending-an...


There are valid scenarios for having a test which is expected to fail in some settings. But of course you should always know why a test might fail and be explicit. (Which is exactly what pending and skipped tests are for.)


  it 'probably should not raise any sort of error' do
    maybe { user }.will_not raise_error
  end
I snorted on that one.


maybe(test).will be_success.on_my_machine

I can’t stop laughing right now. Well done boys, well done.


This is really funny, thanks for sharing.


The epitome of programming in Ruby.


Oh for goodness sake. It's a joke.



You're not making any sense.


Is this serious or a joke? If its serious I seems like a bloody awful idea!! What is the point of a maybe test??


This has to be a joke. I'm fond of TDD just as much as the next person, but seriously, some of you RSpec fanatics have lost your minds.


Sorry, it has to be said:

After some inspection, maybe it passes for a joke.


Maybe.


I promise its a joke. I work with this gent and we were frustrated with some specs so he said he was going to make this. haha.


Pretty sure it's a joke.


Thank god.




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