1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/undefined-for-timeout.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/undefined-for-timeout.js
new file mode 100644
index 0000000000..89038c7ab5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/undefined-for-timeout.js
@@ -0,0 +1,54 @@
+// |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 timeout 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 )
+
+  6. Let q be ? ToNumber(timeout).
+    ...
+    Undefined    Return NaN.
+
+  5.If q is NaN, let t be +∞, else let t be max(q, 0)
+
+flags: [async]
+features: [Atomics.waitAsync, SharedArrayBuffer, TypedArray, Atomics, computed-property-names, Symbol, Symbol.toPrimitive, arrow-function]
+---*/
+assert.sameValue(typeof Atomics.waitAsync, 'function', 'The value of `typeof Atomics.waitAsync` is "function"');
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
+);
+
+const valueOf = {
+  valueOf() {
+    return undefined;
+  }
+};
+
+const toPrimitive = {
+  [Symbol.toPrimitive]() {
+    return undefined;
+  }
+};
+
+Promise.all([
+    Atomics.waitAsync(i32a, 0, 0).value,
+    Atomics.waitAsync(i32a, 0, 0, undefined).value,
+    Atomics.waitAsync(i32a, 0, 0, valueOf).value,
+    Atomics.waitAsync(i32a, 0, 0, toPrimitive).value
+  ]).then(outcomes => {
+    assert.sameValue(outcomes[0], 'ok', 'The value of outcomes[0] is "ok"');
+    assert.sameValue(outcomes[1], 'ok', 'The value of outcomes[1] is "ok"');
+    assert.sameValue(outcomes[2], 'ok', 'The value of outcomes[2] is "ok"');
+    assert.sameValue(outcomes[3], 'ok', 'The value of outcomes[3] is "ok"');
+  }).then($DONE, $DONE);
+
+Atomics.notify(i32a, 0);