1 files changed, 79 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/undefined-index-defaults-to-zero-agent.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/undefined-index-defaults-to-zero-agent.js
new file mode 100644
index 0000000000..294e871035
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/undefined-index-defaults-to-zero-agent.js
@@ -0,0 +1,79 @@
+// |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: >
+  Undefined index arg is coerced to zero
+info: |
+  Atomics.waitAsync( typedArray, index, value, timeout )
+
+  1. Return DoWait(async, typedArray, index, value, timeout).
+
+  DoWait ( mode, typedArray, index, value, timeout )
+
+  2. Let i be ? ValidateAtomicAccess(typedArray, index).
+      ...
+      2.Let accessIndex be ? ToIndex(requestIndex).
+
+      9.If IsSharedArrayBuffer(buffer) is false, throw a TypeError exception.
+        ...
+          3.If bufferData is a Data Block, return false
+
+          If value is undefined, then
+          Let index be 0.
+
+flags: [async]
+includes: [atomicsHelper.js]
+features: [Atomics.waitAsync, SharedArrayBuffer, TypedArray, Atomics, arrow-function, async-functions]
+---*/
+assert.sameValue(typeof Atomics.waitAsync, 'function', 'The value of `typeof Atomics.waitAsync` is "function"');
+
+const WAIT_INDEX = 0;
+const RUNNING = 1;
+const NUMAGENT = 2;
+const NOTIFYCOUNT = 2;
+
+$262.agent.start(`
+  $262.agent.receiveBroadcast(async (sab) => {
+    var i32a = new Int32Array(sab);
+    Atomics.add(i32a, ${RUNNING}, 1);
+
+    $262.agent.report("A " + (await Atomics.waitAsync(i32a, undefined, 0).value));
+    $262.agent.leaving();
+  });
+`);
+
+$262.agent.start(`
+  $262.agent.receiveBroadcast(async (sab) => {
+    var i32a = new Int32Array(sab);
+    Atomics.add(i32a, ${RUNNING}, 1);
+
+    $262.agent.report("B " + (await Atomics.waitAsync(i32a, undefined, 0).value));
+    $262.agent.leaving();
+  });
+`);
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
+);
+
+$262.agent.safeBroadcastAsync(i32a, RUNNING, NUMAGENT).then(async (agentCount) => {
+
+  assert.sameValue(agentCount, NUMAGENT, 'The value of `agentCount` is expected to equal the value of NUMAGENT');
+
+  assert.sameValue(
+    Atomics.notify(i32a, WAIT_INDEX, NOTIFYCOUNT),
+    NOTIFYCOUNT,
+    'Atomics.notify(new Int32Array(new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)), 0, 2) must return the value of NOTIFYCOUNT'
+  );
+
+  const reports = [
+    await $262.agent.getReportAsync(),
+    await $262.agent.getReportAsync(),
+  ];
+
+  reports.sort();
+  assert.sameValue(reports[0], 'A ok', 'The value of reports[0] is "A ok"');
+  assert.sameValue(reports[1], 'B ok', 'The value of reports[1] is "B ok"');
+}).then($DONE, $DONE);