1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/notify/count-from-nans.js b/js/src/tests/test262/built-ins/Atomics/notify/count-from-nans.js
new file mode 100644
index 0000000000..f80d19858e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/notify/count-from-nans.js
@@ -0,0 +1,36 @@
+// |reftest| skip-if(!this.hasOwnProperty('Atomics')||!this.hasOwnProperty('SharedArrayBuffer')||(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('arm64-simulator'))) -- Atomics,SharedArrayBuffer is not enabled unconditionally, ARM64 Simulator cannot emulate atomics
+// Copyright (C) 2018 Rick Waldron.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.notify
+description: >
+  NaNs are converted to 0 for 'count' argument to Atomics.notify
+info: |
+  Atomics.notify( typedArray, index, count )
+
+  ...
+  3. If count is undefined, let c be +∞.
+  4. Else,
+    a. Let intCount be ? ToInteger(count).
+  ...
+
+  ToInteger ( argument )
+
+  ...
+  2. If number is NaN, return +0.
+  ...
+
+includes: [nans.js]
+features: [Atomics, SharedArrayBuffer, TypedArray]
+---*/
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
+);
+
+NaNs.forEach(nan => {
+  assert.sameValue(Atomics.notify(i32a, 0, nan), 0, 'Atomics.notify(i32a, 0, nan) returns 0');
+});
+
+reportCompare(0, 0);