1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/non262/String/replace-rope-empty.js b/js/src/tests/non262/String/replace-rope-empty.js
new file mode 100644
index 0000000000..86c5b5236a
--- /dev/null
+++ b/js/src/tests/non262/String/replace-rope-empty.js
@@ -0,0 +1,30 @@
+// |reftest| skip-if(!xulRuntime.shell)
+
+var BUGNUMBER = 1509768;
+var summary = "String#replace with an empty string pattern on a rope should prepend the replacement string.";
+
+print(BUGNUMBER + ": " + summary);
+
+// Rope is created when the string length >= 25.
+//
+// This testcase depends on that condition to reliably test the code for
+// String#replace on a rope.
+//
+// Please rewrite this testcase when the following assertion fails.
+assertEq(isRope("a".repeat(24)), false);
+assertEq(isRope("a".repeat(25)), true);
+
+// Not a rope.
+assertEq("a".repeat(24).replace("", "foo"),
+         "foo" + "a".repeat(24));
+assertEq("a".repeat(24).replace("", ""),
+         "a".repeat(24));
+
+// A rope.
+assertEq("a".repeat(25).replace("", "foo"),
+         "foo" + "a".repeat(25));
+assertEq("a".repeat(25).replace("", ""),
+         "a".repeat(25));
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);