jest.testSequencer.js

// eslint-disable-next-line @typescript-eslint/no-var-requires
const Sequencer = require('@jest/test-sequencer').default;

class RandomSequencer extends Sequencer {
  sort(tests) {
    const copyTests = Array.from(tests);
    shuffle(copyTests);
    return copyTests;
  }
}

function shuffle(array) {
  var currentIndex = array.length,
    temporaryValue,
    randomIndex;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {
    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
}

// eslint-disable-next-line
class AlphabeticalSequencer extends Sequencer {
  sort(tests) {
    const copyTests = Array.from(tests);
    return copyTests.sort((testA, testB) => (testA.path > testB.path ? 1 : -1));
  }
}

module.exports = RandomSequencer;