post-task-run-order.any.js

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This WPT test may be referenced by the following Test IDs:
- /scheduler/post-task-run-order.any.html - WPT Dashboard Interop Dashboard
- /scheduler/post-task-run-order.any.serviceworker.html - WPT Dashboard Interop Dashboard
- /scheduler/post-task-run-order.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /scheduler/post-task-run-order.any.worker.html - WPT Dashboard Interop Dashboard

// META: title=Scheduler: Tasks Run in Priority Order

// META: global=window,worker

promise_test(async t => {

  const runOrder = [];

  const schedule = (id, priority) => scheduler.postTask(() => { runOrder.push(id); }, {priority});

  // Post tasks in reverse priority order and expect they are run from highest

  // to lowest priority.

  const tasks = [];

  tasks.push(schedule('B1', 'background'));

  tasks.push(schedule('B2', 'background'));

  tasks.push(schedule('UV1', 'user-visible'));

  tasks.push(schedule('UV2', 'user-visible'));

  tasks.push(schedule('UB1', 'user-blocking'));

  tasks.push(schedule('UB2', 'user-blocking'));

  await Promise.all(tasks);

  assert_equals(runOrder.toString(),'UB1,UB2,UV1,UV2,B1,B2');

}, 'Test scheduler.postTask task run in priority order');