<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Verify that promise tasks can be properly tracked.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/mixed-promise-helper.js"></script>
<script src="resources/task-ids.js"></script>
</head>
<body>
<script>
const run_promise_test = () => {
promise_test(async () => {
return new Promise((resolve, reject) => {
const promise_task = scheduler.taskId;
fetch("/resources/blank.html")
.then(response => new Promise(r => {
// A JS-based promise, resolved when the image loads.
assert_equals(scheduler.taskId, parent_task);
assert_not_equals(scheduler.taskId, sibling_task);
assert_equals(scheduler.taskId, promise_task);
image_loaded = r;
fetched_response = response;
image_can_load();
}))
.then(response => {
assert_equals(scheduler.taskId, parent_task);
assert_not_equals(scheduler.taskId, sibling_task);
assert_equals(scheduler.taskId, promise_task);
return response.text();
})
.then(body => {
return new Promise(interimResolve => {
assert_equals(scheduler.taskId, parent_task);
assert_not_equals(scheduler.taskId, sibling_task);
assert_equals(scheduler.taskId, promise_task);
interimResolve();
});
})
.then(() => {
try {
assert_equals(scheduler.taskId, parent_task)
assert_not_equals(scheduler.taskId, sibling_task);
assert_equals(scheduler.taskId, promise_task);
resolve();
} catch {
reject();
}
});
});
}, "All microtasks in the promise chain after fetching a resource are " +
"descendants of the initiating task.");
};
run_test("run_promise_test()");
</script>
</body>
</html>
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