1 files changed, 60 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js b/js/src/tests/test262/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js
new file mode 100644
index 0000000000..b50112e5e6
--- /dev/null
+++ b/js/src/tests/test262/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js
@@ -0,0 +1,60 @@
+// Copyright 2015 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 8.1.1.2.1
+description: >
+    False-coercing `Symbol.unscopables` properties do not block access to object environment record
+info: |
+    [...]
+    6. If the withEnvironment flag of envRec is false, return true.
+    7. Let unscopables be Get(bindings, @@unscopables).
+    8. ReturnIfAbrupt(unscopables).
+    9. If Type(unscopables) is Object, then
+       a. Let blocked be ToBoolean(Get(unscopables, N)).
+       b. ReturnIfAbrupt(blocked).
+       c. If blocked is true, return false.
+    10. Return true.
+
+    ES6: 13.11.7 (The `with` Statement) Runtime Semantics: Evaluation
+    [...]
+    6. Set the withEnvironment flag of newEnv’s EnvironmentRecord to true.
+    [...]
+flags: [noStrict]
+features: [Symbol.unscopables]
+---*/
+
+var x = 0;
+var env = { x: 1 };
+env[Symbol.unscopables] = {};
+
+with (env) {
+  assert.sameValue(x, 1, 'undefined (no property defined)');
+}
+
+env[Symbol.unscopables].x = false;
+with (env) {
+  assert.sameValue(x, 1, 'literal `false` value');
+}
+
+env[Symbol.unscopables].x = undefined;
+with (env) {
+  assert.sameValue(x, 1, 'literal `undefined` value');
+}
+
+env[Symbol.unscopables].x = null;
+with (env) {
+  assert.sameValue(x, 1, 'null value');
+}
+
+env[Symbol.unscopables].x = 0;
+with (env) {
+  assert.sameValue(x, 1, 'literal `0` number value');
+}
+
+env[Symbol.unscopables].x = '';
+with (env) {
+  assert.sameValue(x, 1, 'empty string value');
+}
+
+reportCompare(0, 0);