Comments (3)
I think I can extract one example pretty easily. One co-worker wrote a Merkle Tree or something, it shouldn't have too much dependency with our project.
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On the one hand I'm supportive of this feature.
I've used set_shrink Shrink.nil some_gen
in similar situations for "QCheck1" in the past.
One could go for a similar design for QCheck2
where the operation changes/removes the Tree
children.
On the other hand, to me this indicates short-comings of the QCheck2 shrinkers.
I observed these and commented on them in #157 #163 and #153 (comment) while I was trying to test QCheck2 a bit.
We need example cases to reproduce and understand what is going on when shrinking takes too long in order to improve the situation. I understand that carving out those from a bigger project can require quite some effort though.
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I think I can extract one example pretty easily. One co-worker wrote a Merkle Tree or something, it shouldn't have too much dependency with our project.
Well, you shouldn't trust my words.
Anyway, I feel that we need it even if the generator is not that long. It's very situational but sometimes, no shrinker is the best solution.
My dirty solution currently is:
make_primitive
~gen:(fun rand -> generate1 ~rand gen)
~shrink:(fun _ -> Seq.empty)
I'll try to tackle this.
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Related Issues (20)
- Generator reproducability with function generators
- 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
- custom stopping criteria for tests HOT 1
- 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
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