1 files changed, 91 insertions, 0 deletions
diff --git a/testing/web-platform/tests/web-locks/steal.tentative.https.any.js b/testing/web-platform/tests/web-locks/steal.tentative.https.any.js
new file mode 100644
index 0000000000..d165b9d179
--- /dev/null
+++ b/testing/web-platform/tests/web-locks/steal.tentative.https.any.js
@@ -0,0 +1,91 @@
+// META: title=Web Locks API: steal option
+// META: script=resources/helpers.js
+// META: global=window,dedicatedworker,sharedworker,serviceworker
+
+'use strict';
+
+const never_settled = new Promise(resolve => { /* never */ });
+
+promise_test(async t => {
+  const res = uniqueName(t);
+  let callback_called = false;
+  await navigator.locks.request(res, {steal: true}, lock => {
+    callback_called = true;
+    assert_not_equals(lock, null, 'Lock should be granted');
+  });
+  assert_true(callback_called, 'Callback should be called');
+}, 'Lock available');
+
+promise_test(async t => {
+  const res = uniqueName(t);
+  let callback_called = false;
+
+  // Grab and hold the lock.
+  navigator.locks.request(res, lock => never_settled).catch(_ => {});
+
+  // Steal it.
+  await navigator.locks.request(res, {steal: true}, lock => {
+    callback_called = true;
+    assert_not_equals(lock, null, 'Lock should be granted');
+  });
+
+  assert_true(callback_called, 'Callback should be called');
+}, 'Lock not available');
+
+promise_test(async t => {
+  const res = uniqueName(t);
+
+  // Grab and hold the lock.
+  const promise = navigator.locks.request(res, lock => never_settled);
+  const assertion = promise_rejects_dom(
+    t, 'AbortError', promise, `Initial request's promise should reject`);
+
+  // Steal it.
+  await navigator.locks.request(res, {steal: true}, lock => {});
+
+  await assertion;
+
+}, `Broken lock's release promise rejects`);
+
+promise_test(async t => {
+  const res = uniqueName(t);
+
+  // Grab and hold the lock.
+  navigator.locks.request(res, lock => never_settled).catch(_ => {});
+
+  // Make a request for it.
+  let request_granted = false;
+  const promise = navigator.locks.request(res, lock => {
+    request_granted = true;
+  });
+
+  // Steal it.
+  await navigator.locks.request(res, {steal: true}, lock => {
+    assert_false(request_granted, 'Steal should override request');
+  });
+
+  await promise;
+  assert_true(request_granted, 'Request should eventually be granted');
+
+}, `Requested lock's release promise is deferred`);
+
+promise_test(async t => {
+  const res = uniqueName(t);
+
+  // Grab and hold the lock.
+  navigator.locks.request(res, lock => never_settled).catch(_ => {});
+
+  // Steal it.
+  let saw_abort = false;
+  const first_steal = navigator.locks.request(
+    res, {steal: true}, lock => never_settled).catch(error => {
+      saw_abort = true;
+    });
+
+  // Steal it again.
+  await navigator.locks.request(res, {steal: true}, lock => {});
+
+  await first_steal;
+  assert_true(saw_abort, 'First steal should have aborted');
+
+}, 'Last caller wins');