1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/definition/side-effects-in-extends.js b/js/src/tests/test262/language/statements/class/definition/side-effects-in-extends.js
new file mode 100644
index 0000000000..bdbd255ef9
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/definition/side-effects-in-extends.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.5
+description: >
+    class side effect in extends
+---*/
+var calls = 0;
+class C {}
+class D extends (calls++, C) {}
+assert.sameValue(calls, 1, "The value of `calls` is `1`");
+assert.sameValue(typeof D, 'function', "`typeof D` is `'function'`");
+assert.sameValue(Object.getPrototypeOf(D), C, "`Object.getPrototypeOf(D)` returns `C`");
+assert.sameValue(
+    C.prototype,
+    Object.getPrototypeOf(D.prototype),
+    "The value of `C.prototype` is `Object.getPrototypeOf(D.prototype)`"
+);
+
+reportCompare(0, 0);