1 files changed, 24 insertions, 0 deletions
diff --git a/testing/web-platform/tests/scheduler/task-controller-setPriority1.any.js b/testing/web-platform/tests/scheduler/task-controller-setPriority1.any.js
new file mode 100644
index 0000000000..a59c20cacc
--- /dev/null
+++ b/testing/web-platform/tests/scheduler/task-controller-setPriority1.any.js
@@ -0,0 +1,24 @@
+// META: title=Scheduler: TaskController.setPriority()
+// META: global=window,worker
+'use strict';
+
+promise_test(async t => {
+  const controller = new TaskController();
+  const signal = controller.signal;
+
+  const tasks = [];
+  const runOrder = [];
+  const callback = id => { runOrder.push(id); };
+
+  for (let i = 0; i < 5; i++)
+    tasks.push(scheduler.postTask(() => callback(i), {signal}));
+  tasks.push(scheduler.postTask(() => callback(5), {priority: 'user-blocking'}));
+  tasks.push(scheduler.postTask(() => callback(6), {priority: 'user-visible' }));
+
+  controller.setPriority('background');
+  assert_equals(signal.priority, 'background');
+
+  await Promise.all(tasks);
+
+  assert_equals(runOrder.toString(), '5,6,0,1,2,3,4');
+}, 'Test that TaskController.setPriority() changes the priority of all associated tasks');