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Proptests Workshop

For an overview of built-in arbitraries, see fast-check's documentation

Proptests for mergeSort

In /packages/utils/__tests__/sort.tests.ts you will find a unit test for an implementation of mergeSort. In addition, there's a start for a proptest for the hasTheSameLength property as discussed during the presentation.

  1. Complete the proptest for the hasTheSameLength property
  2. Increase the number of runs for the hasTheSameLength property to 10,000 (you can pass an options object as the second argument to fc.assert)
  3. Try to come up with another property for the mergeSort function

Proptest for React component

In /apps/web/components/__tests__/ContributionList.tests.tsx you will find two integration tests: one with a conventional mock (in the form of json data) and the beginning for a proptest which tests the "it doesn't crash" property.

Complete the following steps to get the proptest working for the React component:

  1. In apps/web/test-utils/arbitraries.ts add the missing fields for the nodeArbitrary. Then use the nodeArbitrary in the repositoriesContributedToArbitrary. Finally, complete the contributionsQueryArbitrary.

  2. In /apps/web/components/__tests__/ContributionList.tests.tsx add checks to the itDoesNotCrash property to get the proptest working.