1 files changed, 23 insertions, 0 deletions
diff --git a/js/src/tests/non262/class/superPropStrictAssign.js b/js/src/tests/non262/class/superPropStrictAssign.js
new file mode 100644
index 0000000000..4b5444a3cf
--- /dev/null
+++ b/js/src/tests/non262/class/superPropStrictAssign.js
@@ -0,0 +1,23 @@
+// While |super| is common in classes, it also works in object litterals,
+// where there is no guarantee of strict mode. Check that we do not somehow
+// get strict mode semantics when they were not called for
+
+// |undefined|, writable: false
+Object.defineProperty(Object.prototype, "prop", { writable: false });
+
+class strictAssignmentTest {
+    constructor() {
+        // Strict mode. Throws.
+        super.prop = 14;
+    }
+}
+
+assertThrowsInstanceOf(()=>new strictAssignmentTest(), TypeError);
+
+// Non-strict. Silent failure.
+({ test() { super.prop = 14; } }).test();
+
+assertEq(Object.prototype.prop, undefined);
+
+if (typeof reportCompare === 'function')
+    reportCompare(0,0,"OK");