1 files changed, 56 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/waitAsync/null-for-timeout.js b/js/src/tests/test262/built-ins/Atomics/waitAsync/null-for-timeout.js
new file mode 100644
index 0000000000..6567c2c7d8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/waitAsync/null-for-timeout.js
@@ -0,0 +1,56 @@
+// |reftest| skip -- 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: >
+  null timeout arg should result in an +0 timeout
+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).
+
+    Null -> Return +0.
+
+features: [Atomics.waitAsync, SharedArrayBuffer, Symbol, Symbol.toPrimitive, TypedArray, computed-property-names, Atomics, 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 null;
+  }
+};
+
+const toPrimitive = {
+  [Symbol.toPrimitive]() {
+    return null;
+  }
+};
+
+assert.sameValue(
+  Atomics.waitAsync(i32a, 0, 0, null).value,
+  'timed-out',
+  'The value of Atomics.waitAsync(i32a, 0, 0, null).value is "timed-out"'
+);
+assert.sameValue(
+  Atomics.waitAsync(i32a, 0, 0, valueOf).value,
+  'timed-out',
+  'The value of Atomics.waitAsync(i32a, 0, 0, valueOf).value is "timed-out"'
+);
+assert.sameValue(
+  Atomics.waitAsync(i32a, 0, 0, toPrimitive).value,
+  'timed-out',
+  'The value of Atomics.waitAsync(i32a, 0, 0, toPrimitive).value is "timed-out"'
+);
+
+reportCompare(0, 0);