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Regression in v2.15.0

See original GitHub issue

🐛 Bug Report

I was trying to upgrade the fast-check version in one of my packages from v2.14.0 to the latest version, but my tests began to fail. I bisected the versions and it looks like the regression occurred in v2.15.0. I’ve also put together a small repro.

To Reproduce

Run the following:

import * as fc from 'fast-check'

fc.assert(
  fc.property(
    fc.tuple(
      fc.tuple(
        fc.func(fc.anything())
      )
    ).map(([x]) => x).map(([x]) => x),
    console.log
  )
)

The following error occurs:

file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/arbitrary/definition/NextArbitrary.js:114
            Object.defineProperty(mappedValue, cloneMethod, { get: () => () => this.mapperWithCloneIfNeeded(v)[0] });
                   ^

TypeError: Cannot redefine property: Symbol(fast-check/cloneMethod)
    at Function.defineProperty (<anonymous>)
    at MapArbitrary.mapperWithCloneIfNeeded (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/arbitrary/definition/NextArbitrary.js:114:20)
    at MapArbitrary.valueMapper (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/arbitrary/definition/NextArbitrary.js:119:49)
    at MapArbitrary.generate (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/arbitrary/definition/NextArbitrary.js:84:21)
    at MapArbitrary.generate (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/arbitrary/definition/NextArbitrary.js:83:28)
    at file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/arbitrary/_internals/TupleArbitrary.js:43:62
    at Array.map (<anonymous>)
    at TupleArbitrary.generate (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/arbitrary/_internals/TupleArbitrary.js:43:49)
    at Property.generate (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/property/Property.generic.js:22:55)
    at Object.value (file:///home/tomer/playground/node_modules/.pnpm/fast-check@2.18.0/node_modules/fast-check/lib/esm/check/runner/Tosser.js:6:28)

Expected behavior

It should run without throwing.

Your environment

Packages / Softwares	Version(s)
fast-check	v2.15.0
node	v16.11.0

Issue Analytics

State:
Created 2 years ago
Comments:6 (6 by maintainers)

Top GitHub Comments

1reaction

TomerAberbachcommented, Oct 23, 2021

Upgraded to v2.18.1 and can confirm my tests are passing 😄

1reaction

dubzzzcommented, Oct 23, 2021

Fix included and published in:

v2.15.1
v2.16.1
v2.17.1
v2.18.1

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