1 files changed, 73 insertions, 0 deletions
diff --git a/testing/web-platform/tests/scheduler/task-signal-any-post-task-run-order.tentative.any.js b/testing/web-platform/tests/scheduler/task-signal-any-post-task-run-order.tentative.any.js
new file mode 100644
index 0000000000..889217b081
--- /dev/null
+++ b/testing/web-platform/tests/scheduler/task-signal-any-post-task-run-order.tentative.any.js
@@ -0,0 +1,73 @@
+// META: title=Scheduler: Tasks Run in Priority Order
+// META: global=window,worker
+
+promise_test(async t => {
+  const runOrder = [];
+  const schedule = (id, signal) => scheduler.postTask(() => { runOrder.push(id); }, {signal});
+
+  const tasks = [];
+  tasks.push(schedule('B1', TaskSignal.any([], {priority: 'background'})));
+  tasks.push(schedule('B2', TaskSignal.any([], {priority: 'background'})));
+  tasks.push(schedule('UV1', TaskSignal.any([], {priority: 'user-visible'})));
+  tasks.push(schedule('UV2', TaskSignal.any([], {priority: 'user-visible'})));
+  tasks.push(schedule('UB1', TaskSignal.any([], {priority: 'user-blocking'})));
+  tasks.push(schedule('UB2', TaskSignal.any([], {priority: 'user-blocking'})));
+
+  await Promise.all(tasks);
+
+  assert_equals(runOrder.toString(),'UB1,UB2,UV1,UV2,B1,B2');
+}, 'scheduler.postTask() tasks run in priority order with a fixed priority composite signal');
+
+promise_test(async t => {
+  const runOrder = [];
+  const schedule = (id, priorityOrSignal) => {
+    if (priorityOrSignal instanceof TaskSignal) {
+      return scheduler.postTask(() => { runOrder.push(id); }, {signal: priorityOrSignal});
+    } else {
+      return scheduler.postTask(() => { runOrder.push(id); }, {priority: priorityOrSignal});
+    }
+  };
+
+  const controller = new TaskController({priority: 'user-blocking'});
+  const signal = TaskSignal.any([], {priority: controller.signal});
+
+  const tasks = [];
+  tasks.push(schedule('B1', signal));
+  tasks.push(schedule('B2', signal));
+  tasks.push(schedule('UV1', 'user-visible'));
+  tasks.push(schedule('UV2', 'user-visible'));
+  tasks.push(schedule('UB1', 'user-blocking'));
+  tasks.push(schedule('UB2', 'user-blocking'));
+
+  controller.setPriority('background');
+
+  await Promise.all(tasks);
+
+  assert_equals(runOrder.toString(),'UB1,UB2,UV1,UV2,B1,B2');
+}, 'scheduler.postTask() tasks run in priority order with a dynamic priority composite signal');
+
+promise_test(async t => {
+  const runOrder = [];
+  const schedule = (id, priorityOrSignal) => {
+    if (priorityOrSignal instanceof TaskSignal) {
+      return scheduler.postTask(() => { runOrder.push(id); }, {signal: priorityOrSignal});
+    } else {
+      return scheduler.postTask(() => { runOrder.push(id); }, {priority: priorityOrSignal});
+    }
+  };
+
+  const parentSignal = TaskSignal.any([], {priority: 'background'});
+  const signal = TaskSignal.any([], {priority: parentSignal});
+
+  const tasks = [];
+  tasks.push(schedule('B1', signal));
+  tasks.push(schedule('B2', signal));
+  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');
+}, 'scheduler.postTask() tasks run in priority order with a composite signal whose source has fixed priority');