Function runFixtures

compiler/packages/snap/src/runner.ts:72–115

* Do a test run and return the test results

(
  worker: Worker & typeof runnerWorker,
  filter: TestFilter | null,
  compilerVersion: number,
)

 * Do a test run and return the test results
 */
async function runFixtures(
  worker: Worker & typeof runnerWorker,
  filter: TestFilter | null,
  compilerVersion: number,
): Promise<TestResults> {
  // We could in theory be fancy about tracking the contents of the fixtures
  // directory via our file subscription, but it's simpler to just re-read
  // the directory each time.
  const fixtures = await getFixtures(filter);
  const isOnlyFixture = filter !== null && fixtures.size === 1;

  let entries: Array<[string, TestResult]>;
  if (!opts.sync) {
    // Note: promise.all to ensure parallelism when enabled
    const work: Array<Promise<[string, TestResult]>> = [];
    for (const [fixtureName, fixture] of fixtures) {
      work.push(
        worker
          .transformFixture(
            fixture,
            compilerVersion,
            (filter?.debug ?? false) && isOnlyFixture,
            true,
          )
          .then(result => [fixtureName, result]),
      );
    }

    entries = await Promise.all(work);
  } else {
    entries = [];
    for (const [fixtureName, fixture] of fixtures) {
      let output = await runnerWorker.transformFixture(
        fixture,
        compilerVersion,
        (filter?.debug ?? false) && isOnlyFixture,
        true,
      );
      entries.push([fixtureName, output]);
    }
  }

  return new Map(entries);
}

// Callback to re-run tests after some change
async function onChange(