1 files changed, 67 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Atomics/notify/count-defaults-to-infinity-undefined.js b/js/src/tests/test262/built-ins/Atomics/notify/count-defaults-to-infinity-undefined.js
new file mode 100644
index 0000000000..c51af98018
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Atomics/notify/count-defaults-to-infinity-undefined.js
@@ -0,0 +1,67 @@
+// |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: >
+  Undefined count arg should result in an infinite count
+info: |
+  Atomics.notify( typedArray, index, count )
+
+  3.If count is undefined, let c be +∞.
+
+includes: [atomicsHelper.js]
+features: [Atomics, SharedArrayBuffer, TypedArray]
+---*/
+
+const RUNNING = 0; // Index to notify agent has started.
+const WAIT_INDEX = 1; // Index all agents are waiting on.
+const BUFFER_SIZE = 2;
+
+const NUMAGENT = 4; // Total number of agents started
+
+for (var i = 0; i < NUMAGENT; i++) {
+  $262.agent.start(`
+    $262.agent.receiveBroadcast(function(sab) {
+      const i32a = new Int32Array(sab);
+      Atomics.add(i32a, ${RUNNING}, 1);
+
+      // Wait until restarted by main thread.
+      var status = Atomics.wait(i32a, ${WAIT_INDEX}, 0);
+
+      // Report wait status and then exit the agent.
+      var name = String.fromCharCode(0x41 + ${i}); // "A", "B", "C", or "D"
+      $262.agent.report(name + " " + status);
+      $262.agent.leaving();
+    });
+  `);
+}
+
+const i32a = new Int32Array(
+  new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * BUFFER_SIZE)
+);
+
+$262.agent.safeBroadcast(i32a);
+$262.agent.waitUntil(i32a, RUNNING, NUMAGENT);
+
+// An agent may have been interrupted between reporting its initial report
+// and the `Atomics.wait` call. Try to yield control to ensure the agent
+// actually started to wait.
+$262.agent.tryYield();
+
+assert.sameValue(Atomics.notify(i32a, WAIT_INDEX, undefined), NUMAGENT,
+                 'Atomics.notify(i32a, WAIT_INDEX, undefined) returns the value of `NUMAGENT`');
+
+const reports = [];
+for (var i = 0; i < NUMAGENT; i++) {
+  reports.push($262.agent.getReport());
+}
+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"');
+assert.sameValue(reports[2], 'C ok', 'The value of reports[2] is "C ok"');
+assert.sameValue(reports[3], 'D ok', 'The value of reports[3] is "D ok"');
+
+reportCompare(0, 0);