Function createTestRunner

curriculum/src/test/test-challenges.js:392–443

(
  challenge,
  solutionFiles,
  buildChallenge,
  solutionFromNext
)

}

async function createTestRunner(
  challenge,
  solutionFiles,
  buildChallenge,
  solutionFromNext
) {
  const { runnerTypes } = await import('@freecodecamp/challenge-builder/build');

  const challengeFiles = replaceChallengeFilesContentsWithSolutions(
    challenge.challengeFiles,
    solutionFiles
  );

  const { build, sources, loadEnzyme } = await buildChallenge(
    {
      ...challenge,
      challengeFiles
    },
    { usesTestRunner: true }
  );

  if (!page) throw new Error('Browser page is not ready yet');

  const evaluator = await getContextEvaluator({
    // passing in challengeId so it's easier to debug timeouts
    challengeId: challenge.id,
    build,
    sources,
    type: runnerTypes[challenge.challengeType],
    loadEnzyme,
    hooks: challenge.hooks
  });

  return async tests => {
    const testStrings = tests.map(test => test.testString);

    const results = await evaluator.evaluate(testStrings, 5000);
    for (let i = 0; i < results.length; i++) {
      const { err } = results[i];
      let { text } = tests[i];
      if (err) {
        text = 'Test text: ' + text;
        const newMessage = solutionFromNext
          ? 'Check next step for solution!\n' + text
          : text;
        err.message = `${newMessage}
Original message: ${err.message}`;
        throw err;
      }
    }
  };
}

function replaceChallengeFilesContentsWithSolutions(
  challengeFiles,