Merge pull request #434 from jugglinmike/symbol-unscopables

Add tests for well-known Symbol: @@unscopables

test/built-ins/Array/prototype/Symbol.unscopables/prop-desc.js

+// 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);

test/built-ins/Array/prototype/Symbol.unscopables/value.js

+// 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');

test/built-ins/Symbol/unscopables/prop-desc.js

+// 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');

test/language/identifier-resolution/unscopables.js

+// 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);

test/language/statements/with/binding-blocked-by-unscopables.js

+// 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');
+}

test/language/statements/with/binding-not-blocked-by-unscopables-falsey-prop.js

+// 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');
+}

test/language/statements/with/binding-not-blocked-by-unscopables-non-obj.js

+// 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);
+}

test/language/statements/with/unscopables-get-err.js

+// 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;
+  });
+}

test/language/statements/with/unscopables-not-referenced-for-undef.js

+// 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);

test/language/statements/with/unscopables-prop-get-err.js

+// 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;
+  });
+}