hubFS: THE place for F#

Hi all,

I've updated FsCheck, a functional random testing framework, ported from Haskell's QuickCheck.

More information on my blog:

http://fortysix-and-two.blogspot.com/2008/08/announcing-fscheck-02.html

thanks everyone who provided feedback on the previous version!

Kurt

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http://fortysix-and-two.blogspot.com/

Update: I noticed that the download comes with a preliminary version of random.fs, which contained many mistakes! I've now updated the link. Sorry!

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http://fortysix-and-two.blogspot.com/

Hi!

I just posted a new version of FsCheck 0.2 which is compatible with the newly released september CTP, and uses the new project structure etc. Good stuff from the F# team!

Follow the link above...

cheers,

Kurt

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http://fortysix-and-two.blogspot.com/

Hi Kurt,

Thanks for doing this, FsCheck saved my day in debugging one project. I have a few questions.

• What are the licensing terms?
• Do you think it's possible to throw some reflection in and get to a point where qcheck (fun a -> a+a = 2*a) would work?
• Do you intend to keep the structure as Haskell-compatible as possible? I would think there are some shortcuts one can take by not being constrained by immutability.

Cheers,

Anton

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Kind Regards,
Anton Tayanovskyy

WebSharper™ - type-safe JavaScript in F#
http://intellifactory.com

Hi Anton,

- FsCheck has a permissive license, like the FreeBSD license ( http://www.freebsd.org/copyright/freebsd-license.html ), under the condition that the QuickCheck license agrees with this (I'll check this, couldn't find anything on the QuickCheck homepage) I guess the worst that could happen is that it becomes (L)GPL.

- Yes, in fact I've added some code that determines the generator automatically, based on the type of the arguments. If you would like a sneak preview of that, email me at kurt dot schelfthout at gmail dot com

Further simplifications I don't see happening; specifically you'll have to keep using 'prop' or 'propl'. Currently the only way out I see is using quotations, which is a huge overkill.

- I no longer explicitly intend to do that. However I must say that I tried taking one of those shortcuts before (in particular, I tried to use 'stateful' random number generator), but I ended up going back to the immutable, pure Haskell implementation, since I ran into problems (with function generation...). But I'm open to suggestions.

I'd like to take this opportunity to announce my plans for the next release:

- smaller bug fixes, some cleaning
- adding FsCheck.fsi module declaration & comments
- derive generators from types of arguments (mostly done)
- ability to group properties in classes, and qcheck the class with one command (mostly done)
- investigate using FsCheck with unit testing frameworks like MbUnit & co, or generally how to use it in practice (currently active)
- putting the project on codeplex + clarifying license

I intend to finalize this before the end of the year.

Finally, I would like to ask you a question: how are you using FsCheck? I mean, do you have a separate console app that you run, or do you use F# interactive, something else?

thanks, and hope this helps,

Kurt

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http://fortysix-and-two.blogspot.com/

Hi Kurt,

Thanks for your reply, very happy it's BSD-licensed.

So far I used a "test.fsx" file in my project with FsCheck tests inside, not sure how it will scale but it's a start. Anyway - keep up the good work. In particular the float generator was very helpful by reminding about the existence of NaN and infinity values.

For educational reasons I'm now playing with implementing something like FsCheck from scratch, and I'm doing random generation the impure way. Would be interesting to see if I also run into the issues you mention :)

--Anton

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Kind Regards,
Anton Tayanovskyy

WebSharper™ - type-safe JavaScript in F#
http://intellifactory.com