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-rw-r--r--js/src/tests/ecma_6/Class/innerBinding.js86
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");