diff --git a/test/built-ins/Array/prototype/Symbol.unscopables/prop-desc.js b/test/built-ins/Array/prototype/Symbol.unscopables/prop-desc.js
new file mode 100644
index 0000000000000000000000000000000000000000..0e33b462436487c42a47f0d8b88dffb33c1519eb
--- /dev/null
+++ b/test/built-ins/Array/prototype/Symbol.unscopables/prop-desc.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2015 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.31
+description: >
+ Property descriptor for initial value of `Symbol.unscopables` property
+info: >
+ This property has the attributes { [[Writable]]: false, [[Enumerable]]:
+ false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [Symbol.unscopables]
+---*/
+
+verifyNotEnumerable(Array.prototype, Symbol.unscopables);
+verifyNotWritable(Array.prototype, Symbol.unscopables);
+verifyConfigurable(Array.prototype, Symbol.unscopables);
diff --git a/test/built-ins/Array/prototype/Symbol.unscopables/value.js b/test/built-ins/Array/prototype/Symbol.unscopables/value.js
new file mode 100644
index 0000000000000000000000000000000000000000..f46879dba793c1c592b1a45da5c0cabf3fa610f0
--- /dev/null
+++ b/test/built-ins/Array/prototype/Symbol.unscopables/value.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2015 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.31
+description: >
+ Initial value of `Symbol.unscopables` property
+info: >
+ 1. Let blackList be ObjectCreate(null).
+ 2. Perform CreateDataProperty(blackList, "copyWithin", true).
+ 3. Perform CreateDataProperty(blackList, "entries", true).
+ 4. Perform CreateDataProperty(blackList, "fill", true).
+ 5. Perform CreateDataProperty(blackList, "find", true).
+ 6. Perform CreateDataProperty(blackList, "findIndex", true).
+ 7. Perform CreateDataProperty(blackList, "keys", true).
+ 8. Perform CreateDataProperty(blackList, "values", true).
+ 9. Assert: Each of the above calls will return true.
+ 10. Return blackList.
+includes: [propertyHelper.js]
+features: [Symbol.unscopables]
+---*/
+
+var unscopables = Array.prototype[Symbol.unscopables];
+
+assert.sameValue(Object.getPrototypeOf(unscopables), null);
+
+assert.sameValue(unscopables.copyWithin, true, '`copyWithin` property value');
+verifyEnumerable(unscopables, 'copyWithin');
+verifyWritable(unscopables, 'copyWithin');
+verifyConfigurable(unscopables, 'copyWithin');
+
+assert.sameValue(unscopables.entries, true, '`entries` property value');
+verifyEnumerable(unscopables, 'entries');
+verifyWritable(unscopables, 'entries');
+verifyConfigurable(unscopables, 'entries');
+
+assert.sameValue(unscopables.fill, true, '`fill` property value');
+verifyEnumerable(unscopables, 'fill');
+verifyWritable(unscopables, 'fill');
+verifyConfigurable(unscopables, 'fill');
+
+assert.sameValue(unscopables.find, true, '`find` property value');
+verifyEnumerable(unscopables, 'find');
+verifyWritable(unscopables, 'find');
+verifyConfigurable(unscopables, 'find');
+
+assert.sameValue(unscopables.findIndex, true, '`findIndex` property value');
+verifyEnumerable(unscopables, 'findIndex');
+verifyWritable(unscopables, 'findIndex');
+verifyConfigurable(unscopables, 'findIndex');
+
+assert.sameValue(unscopables.keys, true, '`keys` property value');
+verifyEnumerable(unscopables, 'keys');
+verifyWritable(unscopables, 'keys');
+verifyConfigurable(unscopables, 'keys');
+
+assert.sameValue(unscopables.values, true, '`values` property value');
+verifyEnumerable(unscopables, 'values');
+verifyWritable(unscopables, 'values');
+verifyConfigurable(unscopables, 'values');
diff --git a/test/built-ins/Symbol/unscopables/prop-desc.js b/test/built-ins/Symbol/unscopables/prop-desc.js
new file mode 100644
index 0000000000000000000000000000000000000000..fdc227a2f6eb41ea26bf31e10261a93d3913ee7e
--- /dev/null
+++ b/test/built-ins/Symbol/unscopables/prop-desc.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2015 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 19.4.2.14
+description: >
+ `Symbol.unscopables` property descriptor
+info: >
+ This property has the attributes { [[Writable]]: false, [[Enumerable]]:
+ false, [[Configurable]]: false }.
+includes: [propertyHelper.js]
+features: [Symbol.unscopables]
+---*/
+
+assert.sameValue(typeof Symbol.unscopables, 'symbol');
+verifyNotEnumerable(Symbol, 'unscopables');
+verifyNotWritable(Symbol, 'unscopables');
+verifyNotConfigurable(Symbol, 'unscopables');
diff --git a/test/language/identifier-resolution/unscopables.js b/test/language/identifier-resolution/unscopables.js
new file mode 100644
index 0000000000000000000000000000000000000000..d9de44ff5e2a455a9321ed64830a5aa1de9750e4
--- /dev/null
+++ b/test/language/identifier-resolution/unscopables.js
@@ -0,0 +1,23 @@
+// Copyright 2015 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 8.1.1.4.1
+includes: [fnGlobalObject.js]
+description: >
+ `Symbol.unscopables` is not referenced when finding bindings in global scope
+info: >
+ 1. Let envRec be the global Environment Record for which the method was
+ invoked.
+ 2. Let DclRec be envRec.[[DeclarativeRecord]].
+ 3. If DclRec.HasBinding(N) is true, return true.
+ 4. Let ObjRec be envRec.[[ObjectRecord]].
+ 5. Return ObjRec.HasBinding(N).
+features: [Symbol.unscopables]
+---*/
+
+var x = 86;
+fnGlobalObject()[Symbol.unscopables] = {
+ x: true
+};
+assert.sameValue(x, 86);
diff --git a/test/language/statements/with/binding-blocked-by-unscopables.js b/test/language/statements/with/binding-blocked-by-unscopables.js
new file mode 100644
index 0000000000000000000000000000000000000000..e8c431754442812fdd4b2975be99e75308d397e2
--- /dev/null
+++ b/test/language/statements/with/binding-blocked-by-unscopables.js
@@ -0,0 +1,52 @@
+// 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: >
+ True-coercing `Symbol.unscopables` properties 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.
+
+ 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] = { x: true };
+
+with (env) {
+ assert.sameValue(x, 0, 'literal `true` value');
+}
+
+env[Symbol.unscopables].x = 'string';
+with (env) {
+ assert.sameValue(x, 0, 'non-empty string values');
+}
+
+env[Symbol.unscopables].x = 86;
+with (env) {
+ assert.sameValue(x, 0, 'non-zero number values');
+}
+
+env[Symbol.unscopables].x = {};
+with (env) {
+ assert.sameValue(x, 0, 'object values');
+}
+
+env[Symbol.unscopables].x = Symbol.unscopables;
+with (env) {
+ assert.sameValue(x, 0, 'Symbol values');
+}
diff --git a/test/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js b/test/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js
new file mode 100644
index 0000000000000000000000000000000000000000..313b0d6773812eea50652f5fbe7a7a869cc1ac0b
--- /dev/null
+++ b/test/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js
@@ -0,0 +1,58 @@
+// 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');
+}
diff --git a/test/language/statements/with/binding-not-blocked-by-unscopables-non-obj.js b/test/language/statements/with/binding-not-blocked-by-unscopables-non-obj.js
new file mode 100644
index 0000000000000000000000000000000000000000..e838ab949c257121a483570ce7ff5392f0e82f32
--- /dev/null
+++ b/test/language/statements/with/binding-not-blocked-by-unscopables-non-obj.js
@@ -0,0 +1,32 @@
+// 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: Non-object values of `Symbol.unscopables` property are ignored
+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 test262ToString = {};
+var env = { toString: test262ToString };
+env[Symbol.unscopables] = '';
+
+with (env) {
+ assert.sameValue(toString, test262ToString);
+}
diff --git a/test/language/statements/with/unscopables-get-err.js b/test/language/statements/with/unscopables-get-err.js
new file mode 100644
index 0000000000000000000000000000000000000000..be0cbb6a230857291a2e7942f18361342d071bf5
--- /dev/null
+++ b/test/language/statements/with/unscopables-get-err.js
@@ -0,0 +1,33 @@
+// 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: >
+ Behavior when accessing `Symbol.unscopables` property value throws an error
+info: >
+ [...]
+ 6. If the withEnvironment flag of envRec is false, return true.
+ 7. Let unscopables be Get(bindings, @@unscopables).
+ 8. ReturnIfAbrupt(unscopables).
+
+ 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 env = { x: 86 };
+Object.defineProperty(env, Symbol.unscopables, {
+ get: function() {
+ throw new Test262Error();
+ }
+});
+
+with (env) {
+ assert.throws(Test262Error, function() {
+ void x;
+ });
+}
diff --git a/test/language/statements/with/unscopables-not-referenced-for-undef.js b/test/language/statements/with/unscopables-not-referenced-for-undef.js
new file mode 100644
index 0000000000000000000000000000000000000000..0b5e3a602b25a091711f67ceef92f888813c4247
--- /dev/null
+++ b/test/language/statements/with/unscopables-not-referenced-for-undef.js
@@ -0,0 +1,37 @@
+// 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: >
+ `Symbol.unscopables` is not referenced when environment record does not have requested property
+info: >
+ 1. Let envRec be the object Environment Record for which the method was
+ invoked.
+ 2. Let bindings be the binding object for envRec.
+ 3. Let foundBinding be HasProperty(bindings, N)
+ 4. ReturnIfAbrupt(foundBinding).
+ 5. If foundBinding is false, return false.
+
+ 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 = {};
+var callCount = 0;
+Object.defineProperty(env, Symbol.unscopables, {
+ get: function() {
+ callCount += 1;
+ }
+});
+
+with (env) {
+ void x;
+}
+
+assert.sameValue(callCount, 0);
diff --git a/test/language/statements/with/unscopables-prop-get-err.js b/test/language/statements/with/unscopables-prop-get-err.js
new file mode 100644
index 0000000000000000000000000000000000000000..d5d16fe2c728686fcc1289c560a0204527f3a24f
--- /dev/null
+++ b/test/language/statements/with/unscopables-prop-get-err.js
@@ -0,0 +1,38 @@
+// 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: >
+ Behavior when accessing property of `Symbol.unscopables` property throws an error
+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).
+
+ 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 env = { x: 86 };
+env[Symbol.unscopables] = {};
+
+Object.defineProperty(env[Symbol.unscopables], 'x', {
+ get: function() {
+ throw new Test262Error();
+ }
+});
+
+with (env) {
+ assert.throws(Test262Error, function() {
+ void x;
+ });
+}