1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/non262/class/subclassedArrayUnboxed.js b/js/src/tests/non262/class/subclassedArrayUnboxed.js
new file mode 100644
index 0000000000..eb27a960d0
--- /dev/null
+++ b/js/src/tests/non262/class/subclassedArrayUnboxed.js
@@ -0,0 +1,22 @@
+class foo extends Array { }
+
+function testArrs(arrs) {
+    for (let arr of arrs) {
+        assertEq(Object.getPrototypeOf(arr), foo.prototype);
+    }
+}
+
+var arrs = [];
+for (var i = 0; i < 25; i++)
+    arrs.push(new foo(1));
+
+testArrs(arrs);
+
+arrs[0].nonIndexedProp = "uhoh";
+
+arrs.push(new foo(1));
+
+testArrs(arrs);
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");