A simple random test case generator for MessageFormat 2.0, written in Haskell.

The generator is based on the ABNF grammar as of this commit. Any future grammar changes will require updating this generator to provide test coverage.

Some grammar productions are simplified to produce more readable test cases. Those have been noted throughout.

Usage

This is meant to be run as a script, but could be made into a proper Cabal package in the future.

Requires any reasonably modern GHC version.

Install the random package if necessary:

$ cabal install --lib random

Then run the script:

$ ghc --run Main.hs
{ "src" : "\\|{#T:l u-.z:w = $z A-.7=n.-8 x.39:O=$L-.8 @w7-d = || @E:q @H.Yk = $V }{#t:c.-c @t-3M @dc4-=K8H4 @B:Q..-}{:H:O0.V E = $s q---:L =|A #| S = |\\\\\\\\{| @w:p-.Z =|{{\\|| @m1U.:cP02 =$s @q }" },
[...]

Adjust maxLen, weight, and numTests in the code as desired (these could be made into command-line flags in the future).