diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/strings.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/strings.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+load(libdir + "parallelarray-helpers.js");
+
+if (getBuildConfiguration().parallelJS) {
+  var rope = "";
+  for (var i = 0; i < 100; i++) {
+    rope += i + "[:" + i + ":]";
+  }
+
+  assertArraySeqParResultsEq(
+    range(0, minItemsTestingThreshold),
+    "map",
+    function f(i) {
+      var s1 = "foo";
+
+      // Test conversions and concatenation.
+      var s2 = s1 + 1;
+      var s3 = s1 + 0.42;
+      var s4 = s2 + s3;
+      var s5 = s4 + rope;
+
+      // Tests flattening.
+      return s5 == "foo1foo0.420[:0:]1[:1:]2[:2:]3[:3:]4[:4:]5[:5:]6[:6:]7[:7:]8[:8:]9[:9:]10[:10:]11[:11:]12[:12:]13[:13:]14[:14:]15[:15:]16[:16:]17[:17:]18[:18:]19[:19:]20[:20:]21[:21:]22[:22:]23[:23:]24[:24:]25[:25:]26[:26:]27[:27:]28[:28:]29[:29:]30[:30:]31[:31:]32[:32:]33[:33:]34[:34:]35[:35:]36[:36:]37[:37:]38[:38:]39[:39:]40[:40:]41[:41:]42[:42:]43[:43:]44[:44:]45[:45:]46[:46:]47[:47:]48[:48:]49[:49:]50[:50:]51[:51:]52[:52:]53[:53:]54[:54:]55[:55:]56[:56:]57[:57:]58[:58:]59[:59:]60[:60:]61[:61:]62[:62:]63[:63:]64[:64:]65[:65:]66[:66:]67[:67:]68[:68:]69[:69:]70[:70:]71[:71:]72[:72:]73[:73:]74[:74:]75[:75:]76[:76:]77[:77:]78[:78:]79[:79:]80[:80:]81[:81:]82[:82:]83[:83:]84[:84:]85[:85:]86[:86:]87[:87:]88[:88:]89[:89:]90[:90:]91[:91:]92[:92:]93[:93:]94[:94:]95[:95:]96[:96:]97[:97:]98[:98:]99[:99:]"
+    });
+}