Comments (1)
Here's a couple of half-baked ideas to achieve something like that:
- By raising a suitable exception upon meeting the criteria and wrapping a
try
-catch
of aroundTest.check_*
to catch the test error - By expressing the criteria as a precondition with
assume
(or==>
- but beware it evaluates both sides eagerly in CBV OCaml). This approach will have the drawback of repeatedly trying to satisfy the criteria before finally giving up.
Interface-wise, rather than an impure function unit -> bool
I suppose one could also extend QCheck with a dedicated exception Stop_criteria_met
and a handler and message for that particular exception in the test driver loop. That should be mostly free for QCheck
users who don't use the feature.
From 10.000 ft, If I'm interested in maximizing coverage, rather than extending a blackbox PBT framework, I would probably recommend a "graybox" PBT framework such as Crowbar: https://github.com/stedolan/crowbar. It has a similar QuickCheck-like interface, but underneath the hood the AFL fuzz engine takes coverage into account when generating input test data.
As such, I would prefer to better understand a concrete QCheck use case first 🤔
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Related Issues (20)
- Add range_subset, pos_split2, nat_split2, pos_split, nat_split to QCheck2
- QCheck int shrinker produces duplicates
- Share some code between QCheck and QCheck2
- Missing QCheck.Shrink.bool HOT 1
- Extend expect tests to OCaml 5.0
- count cannot be zero HOT 4
- QCheck.numeral_string may shrink to non-numerals HOT 1
- Rename default branch HOT 1
- Add warning to Gen.generate* functions
- Add opam package descriptions
- Non-minimal list counter examples HOT 2
- ppx_deriving_qcheck cannot derive a generator from a recursive type declaration with containers HOT 4
- missing usage with dune HOT 5
- Lower ppx_deriving_qcheck's qcheck dependency
- Switch to ocaml-ci
- Less exhaustive string shrinking HOT 7
- Documentation - role of `Gen.t` vs. `arbitrary` HOT 3
- memory usage problems HOT 7
- Expect test failures on stddev under Windows
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