1 files changed, 86 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Class/innerBinding.js b/js/src/tests/ecma_6/Class/innerBinding.js
new file mode 100644
index 000000000..b1afa177e
--- /dev/null
+++ b/js/src/tests/ecma_6/Class/innerBinding.js
@@ -0,0 +1,86 @@
+// Named class definitions should create an immutable inner binding.
+// Since all code in classes is in strict mode, attempts to mutate it
+// should throw.
+class Foof { constructor() { }; tryBreak() { Foof = 4; } }
+for (let result of [Foof, class Bar { constructor() { }; tryBreak() { Bar = 4; } }])
+    assertThrowsInstanceOf(() => new result().tryBreak(), TypeError);
+
+{
+    class foo { constructor() { }; tryBreak() { foo = 4; } }
+    for (let result of [foo, class Bar { constructor() { }; tryBreak() { Bar = 4 } }])
+        assertThrowsInstanceOf(() => new result().tryBreak(), TypeError);
+}
+
+// TDZ applies to inner bindings
+assertThrowsInstanceOf(()=>eval(`class Bar {
+                                    constructor() { };
+                                    [Bar] () { };
+                                 }`), ReferenceError);
+
+assertThrowsInstanceOf(()=>eval(`(class Bar {
+                                    constructor() { };
+                                    [Bar] () { };
+                                 })`), ReferenceError);
+
+// There's no magic "inner binding" global
+{
+    class Foo {
+        constructor() { };
+        test() {
+            class Bar {
+                constructor() { }
+                test() { return Foo === Bar }
+            }
+            return new Bar().test();
+        }
+    }
+    assertEq(new Foo().test(), false);
+    assertEq(new class foo {
+        constructor() { };
+        test() {
+            return new class bar {
+                constructor() { }
+                test() { return foo === bar }
+            }().test();
+        }
+    }().test(), false);
+}
+
+// Inner bindings are shadowable
+{
+    class Foo {
+        constructor() { }
+        test(Foo) { return Foo; }
+    }
+    assertEq(new Foo().test(4), 4);
+    assertEq(new class foo {
+        constructor() { };
+        test(foo) { return foo }
+    }().test(4), 4);
+}
+
+// Inner bindings in expressions should shadow even existing names.
+class Foo { constructor() { } static method() { throw new Error("NO!"); } }
+assertEq(new class Foo {
+            constructor() { };
+            static method() { return 4; };
+            test() { return Foo.method(); }
+         }().test(), 4);
+
+// The outer binding is distinct from the inner one
+{
+    let orig_X;
+
+    class X {
+        constructor() { }
+        f() { assertEq(X, orig_X); }
+    }
+
+    orig_X = X;
+    X = 13;
+    assertEq(X, 13);
+    new orig_X().f();
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, "OK");