1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arrays/reverse-nonarray-nonwritable-element.js b/js/src/jit-test/tests/arrays/reverse-nonarray-nonwritable-element.js
new file mode 100644
index 0000000000..bca75a96b3
--- /dev/null
+++ b/js/src/jit-test/tests/arrays/reverse-nonarray-nonwritable-element.js
@@ -0,0 +1,13 @@
+// Array.prototype.reverse does a strict assignment to this.length even if the
+// caller is nonstrict. Bug 886087.
+
+load(libdir + "asserts.js");
+
+// obj[1] is read-only
+var obj = {0: "zero", length: 2, reverse: [].reverse};
+Object.defineProperty(obj, "1", {configurable: true, value: "one", writable: false});
+assertThrowsInstanceOf(() => obj.reverse(), TypeError);
+
+// obj[1] has only a getter
+Object.defineProperty(obj, "1", {configurable: true, get: () => "one"});
+assertThrowsInstanceOf(() => obj.reverse(), TypeError);