diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/write-array.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/write-array.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+load(libdir + "parallelarray-helpers.js");
+
+function buildSimple() {
+  assertParallelModesCommute(["seq", "par"], function(m) {
+    return Array.buildPar(256, function(i) {
+      let obj = [0, 1, 2];
+      obj[0] += 1;
+      obj[1] += 1;
+      obj[2] += 1;
+      return obj;
+    }, m);
+  });
+}
+
+if (getBuildConfiguration().parallelJS)
+  buildSimple();