1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/scope-name-lex-open-heritage.js b/js/src/tests/test262/language/statements/class/scope-name-lex-open-heritage.js
new file mode 100644
index 0000000000..fb2a809b40
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/scope-name-lex-open-heritage.js
@@ -0,0 +1,48 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-runtime-semantics-classdefinitionevaluation
+description: >
+    Creation of new lexical environment for the class "name" (with a heritage)
+info: |
+    1. Let lex be the LexicalEnvironment of the running execution context.
+    2. Let classScope be NewDeclarativeEnvironment(lex).
+    3. Let classScopeEnvRec be classScope's EnvironmentRecord.
+    4. If className is not undefined, then
+       a. Perform classScopeEnvRec.CreateImmutableBinding(className, true).
+    5. If ClassHeritageopt is not present, then
+       [...]
+    6. Else,
+       a. Set the running execution context's LexicalEnvironment to classScope.
+       [...]
+---*/
+
+var setBefore = function() { C = null; };
+var probeBefore = function() { return C; };
+var probeHeritage, setHeritage;
+
+class C extends (
+    probeHeritage = function() { return C; },
+    setHeritage = function() { C = null; }
+  ) {
+  method() {
+    return C;
+  }
+};
+
+var cls = probeBefore();
+assert.sameValue(typeof cls, 'function');
+setBefore();
+assert.sameValue(probeBefore(), null);
+assert.sameValue(probeHeritage(), cls, 'inner binding is independent');
+assert.throws(
+  TypeError, setHeritage, 'inner binding rejects modification'
+);
+assert.sameValue(
+  typeof probeHeritage(), 'function', 'inner binding is immutable'
+);
+assert.sameValue(
+  typeof cls.prototype.method(), 'function', 'from instance method'
+);
+
+reportCompare(0, 0);