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diff --git a/testing/web-platform/tests/web-locks/workers.tentative.https.html b/testing/web-platform/tests/web-locks/workers.tentative.https.html
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+++ b/testing/web-platform/tests/web-locks/workers.tentative.https.html
@@ -0,0 +1,122 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Web Locks API: Workers</title>
+<link rel=help href="https://w3c.github.io/web-locks/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/helpers.js"></script>
+<script>
+'use strict';
+
+promise_test(async t => {
+  assert_implements(navigator.locks);
+  const worker = new Worker('resources/worker.js');
+  t.add_cleanup(() => { worker.terminate(); });
+
+  const res = 'shared resource 1';
+
+  const lock_id = (await postToWorkerAndWait(
+    worker, {op: 'request', name: res, mode: 'shared'})).lock_id;
+
+  await navigator.locks.request(res, {mode: 'shared'}, async lock => {
+    await postToWorkerAndWait(worker, {op: 'release', lock_id});
+  });
+
+}, 'Window and Worker - shared mode');
+
+promise_test(async t => {
+  assert_implements(navigator.locks);
+  const worker = new Worker('resources/worker.js');
+  t.add_cleanup(() => { worker.terminate(); });
+
+  const res = 'exclusive resource 1';
+
+  // worker acquires the lock.
+  const lock_id = (await postToWorkerAndWait(
+    worker, {op: 'request', name: res})).lock_id;
+
+  // This request should be blocked.
+  let lock_granted = false;
+  const blocked = navigator.locks.request(
+    res, lock => { lock_granted = true; });
+
+  // Verify we can't get it.
+  let available = undefined;
+  await navigator.locks.request(
+    res, {ifAvailable: true}, lock => { available = lock !== null; });
+  assert_false(available);
+  assert_false(lock_granted);
+
+  // Ask the worker to release it.
+  await postToWorkerAndWait(worker, {op: 'release', lock_id});
+
+  // Now we've got it.
+  const lock2 = await blocked;
+  assert_true(lock_granted);
+
+}, 'Window and Worker - exclusive mode');
+
+promise_test(async t => {
+  assert_implements(navigator.locks);
+  const worker1 = new Worker('resources/worker.js');
+  const worker2 = new Worker('resources/worker.js');
+  t.add_cleanup(() => { worker1.terminate(); worker2.terminate(); });
+
+  const res = 'exclusive resource 2';
+
+  // worker1 acquires the lock.
+  const lock_id = (await postToWorkerAndWait(
+    worker1, {op: 'request', name: res})).lock_id;
+
+  // This request should be blocked.
+  let lock_granted = false;
+  const blocked = postToWorkerAndWait(
+    worker2, {op: 'request', name: res});
+  blocked.then(f => { lock_granted = true; });
+
+  // Verify worker2 can't get it.
+  assert_true((await postToWorkerAndWait(worker2, {
+    op: 'request', name: res, ifAvailable: true
+  })).failed, 'Lock request should have failed');
+  assert_false(lock_granted);
+
+  // Ask worker1 to release it.
+  await postToWorkerAndWait(worker1, {op: 'release', lock_id});
+
+  // Now worker2 can get it.
+  const lock = await blocked;
+  assert_true(lock_granted);
+
+}, 'Worker and Worker - exclusive mode');
+
+promise_test(async t => {
+  assert_implements(navigator.locks);
+  const worker = new Worker('resources/worker.js');
+
+  const res = 'exclusive resource 3';
+
+  // Worker acquires the lock.
+  await postToWorkerAndWait(worker, {op: 'request', name: res});
+
+  // This request should be blocked.
+  let lock_granted = false;
+  const blocked = navigator.locks.request(
+    res, lock => { lock_granted = true; });
+
+  // Verify we can't get it.
+  let available = undefined;
+  await navigator.locks.request(
+    res, {ifAvailable: true}, lock => { available = lock !== null; });
+  assert_false(available);
+  assert_false(lock_granted);
+
+  // Implicitly release it by terminating the worker.
+  worker.terminate();
+
+  // Now we've got it.
+  const lock = await blocked;
+  assert_true(lock_granted);
+
+}, 'Terminated Worker - exclusive mode');
+
+</script>