1 files changed, 76 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/notify/undefined-index-defaults-to-zero.js b/js/src/tests/test262/built-ins/Atomics/notify/undefined-index-defaults-to-zero.js
new file mode 100644
index 0000000000..a0bbca4f4e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/notify/undefined-index-defaults-to-zero.js
@@ -0,0 +1,76 @@
+// |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 Amal Hussein. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-atomics.notify
+description: >
+  An undefined index arg should translate to 0
+info: |
+  Atomics.notify( typedArray, index, count )
+
+  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.
+includes: [atomicsHelper.js]
+features: [Atomics, SharedArrayBuffer, TypedArray]
+---*/
+
+var WAIT_INDEX = 0;
+var RUNNING = 1;
+
+var NUMAGENT = 2;
+
+for (var i = 0; i < NUMAGENT; i++) {
+  $262.agent.start(`
+    $262.agent.receiveBroadcast(function(sab) {
+      const i32a = new Int32Array(sab);
+
+      // Notify main thread that the agent was started.
+      Atomics.add(i32a, ${RUNNING}, 1);
+
+      // Wait until restarted by main thread.
+      var status = Atomics.wait(i32a, ${WAIT_INDEX}, 0);
+
+      // Report wait status.
+      $262.agent.report(status);
+
+      $262.agent.leaving();
+    });
+  `);
+}
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 4)
+);
+
+$262.agent.safeBroadcast(i32a);
+
+// Wait until both agents started.
+$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
+
+// Try to yield control to ensure the agents actually started to wait.
+$262.agent.tryYield();
+
+// Notify at index 0, undefined => 0.
+var woken = 0;
+while ((woken = Atomics.notify(i32a, undefined, 1)) === 0) ;
+assert.sameValue(woken, 1, 'Atomics.notify(i32a, undefined, 1) returns 1');
+
+assert.sameValue($262.agent.getReport(), 'ok', '$262.agent.getReport() returns "ok"');
+
+// Notify again at index 0, default => 0.
+var woken = 0;
+while ((woken = Atomics.notify(i32a /*, default values used */)) === 0) ;
+assert.sameValue(woken, 1, 'Atomics.notify(i32a /*, default values used */) returns 1');
+
+assert.sameValue($262.agent.getReport(), 'ok', '$262.agent.getReport() returns "ok"');
+
+reportCompare(0, 0);