1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/tests/web-locks/mode-exclusive.tentative.https.any.js b/testing/web-platform/tests/web-locks/mode-exclusive.tentative.https.any.js
new file mode 100644
index 0000000000..8450e237c3
--- /dev/null
+++ b/testing/web-platform/tests/web-locks/mode-exclusive.tentative.https.any.js
@@ -0,0 +1,34 @@
+// META: title=Web Locks API: Exclusive Mode
+// META: global=window,dedicatedworker,sharedworker,serviceworker
+
+'use strict';
+
+promise_test(async t => {
+  const granted = [];
+  function log_grant(n) { return () => { granted.push(n); }; }
+
+  await Promise.all([
+    navigator.locks.request('a', log_grant(1)),
+    navigator.locks.request('a', log_grant(2)),
+    navigator.locks.request('a', log_grant(3))
+  ]);
+  assert_array_equals(granted, [1, 2, 3]);
+}, 'Lock requests are granted in order');
+
+promise_test(async t => {
+  const granted = [];
+  function log_grant(n) { return () => { granted.push(n); }; }
+
+  let inner_promise;
+  await navigator.locks.request('a', async lock => {
+    inner_promise = Promise.all([
+      // This will be blocked.
+      navigator.locks.request('a', log_grant(1)),
+      // But this should be grantable immediately.
+      navigator.locks.request('b', log_grant(2))
+    ]);
+  });
+
+  await inner_promise;
+  assert_array_equals(granted, [2, 1]);
+}, 'Requests for distinct resources can be granted');