1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/non262/Tuple/from/elements-added-after.js b/js/src/tests/non262/Tuple/from/elements-added-after.js
new file mode 100644
index 0000000000..d0c045ffb6
--- /dev/null
+++ b/js/src/tests/non262/Tuple/from/elements-added-after.js
@@ -0,0 +1,29 @@
+// |reftest| skip-if(!this.hasOwnProperty("Tuple"))
+var tupleIndex = -1;
+var originalLength = 7;
+var obj = {
+  length: originalLength,
+  0: 2,
+  1: 4,
+  2: 8,
+  3: 16,
+  4: 32,
+  5: 64,
+  6: 128
+};
+var tuple = #[2, 4, 8, 16, 32, 64, 128];
+
+function mapFn(value, index) {
+    tupleIndex++;
+    assertEq(value, obj[tupleIndex]);
+    assertEq(index, tupleIndex);
+    obj[originalLength + tupleIndex] = 2 * tupleIndex + 1;
+
+    return obj[tupleIndex];
+}
+
+
+var t = Tuple.from(obj, mapFn);
+assertEq(t, tuple);
+
+reportCompare(0, 0);