Function setupScheduler

packages/jest-core/src/__tests__/TestScheduler.test.js:92–96

  // Helper: createTestScheduler + scheduleTests([]) so reporters are set up.
  const setupScheduler = async config => {
    const scheduler = await createTestScheduler(config, {}, {});
    await scheduler.scheduleTests([], mockWatcher);
    return scheduler;
  };

  beforeEach(() => {
    for (const key of AGENT_ENV_VARS) {