diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-reducePar-length-one.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-reducePar-length-one.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function testReduceOne() {
+    // Note: parallel execution with only 1 element will generally
+    // bailout, so don't use assertParallelArrayModesEq() here.
+    var p = [1];
+    var r = p.reducePar(function (v, p) { return v*p; });
+    assertEq(r, 1);
+}
+
+if (getBuildConfiguration().parallelJS)
+  testReduceOne();