1 files changed, 70 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/good-views.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/good-views.js
new file mode 100644
index 0000000000..343b706a41
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/good-views.js
@@ -0,0 +1,70 @@
+// |reftest| skip async -- Atomics.waitAsync is not supported
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.waitasync
+description: >
+  Test Atomics.waitAsync on arrays that allow atomic operations
+flags: [async]
+includes: [atomicsHelper.js, asyncHelpers.js]
+features: [Atomics.waitAsync, Atomics]
+---*/
+assert.sameValue(typeof Atomics.waitAsync, 'function', 'The value of `typeof Atomics.waitAsync` is "function"');
+
+$262.agent.start(`
+  (async () => {
+    var sab = new SharedArrayBuffer(1024);
+    var good_indices = [ (view) => 0/-1, // -0
+                         (view) => '-0',
+                         (view) => view.length - 1,
+                         (view) => ({ valueOf: () => 0 }),
+                         (view) => ({ toString: () => '0', valueOf: false }) // non-callable valueOf triggers invocation of toString
+                       ];
+
+    var view = new Int32Array(sab, 32, 20);
+
+    view[0] = 0;
+    $262.agent.report("A " + (await Atomics.waitAsync(view, 0, 0, 0).value))
+    $262.agent.report("B " + (await Atomics.waitAsync(view, 0, 37, 0).value));
+
+    const results = [];
+    // In-bounds boundary cases for indexing
+    for ( let IdxGen of good_indices ) {
+        let Idx = IdxGen(view);
+        view.fill(0);
+        // Atomics.store() computes an index from Idx in the same way as other
+        // Atomics operations, not quite like view[Idx].
+        Atomics.store(view, Idx, 37);
+        results.push(await Atomics.waitAsync(view, Idx, 0).value);
+    }
+    $262.agent.report("C " + results.join(","));
+    $262.agent.leaving();
+  })();
+`);
+
+
+asyncTest(async () => {
+  const outcomes = [];
+
+  for (let i = 0; i < 3; i++) {
+    outcomes.push(await $262.agent.getReportAsync());
+  }
+
+  assert.sameValue(
+    outcomes[0],
+    'A timed-out',
+    'The value of outcomes[0] is "A timed-out"'
+  );
+
+  assert.sameValue(
+    outcomes[1],
+    'B not-equal',
+    'The value of outcomes[1] is "B not-equal"'
+  );
+  assert.sameValue(
+    outcomes[2],
+    'C not-equal,not-equal,not-equal,not-equal,not-equal',
+    'The value of outcomes[2] is "C not-equal,not-equal,not-equal,not-equal,not-equal"'
+  );
+});