Object.prototype.toString: improve coverage

test/built-ins/Object/prototype/toString/symbol-tag-array-builtin.js

@@ -11,7 +11,7 @@ info: |
   15. Let tag be ? Get(O, @@toStringTag).
   16. If Type(tag) is not String, set tag to builtinTag.
   17. Return the string-concatenation of "[object ", tag, and "]".
-features: [Symbol.toStringTag, Symbol.iterator]
+features: [Symbol.toStringTag, Symbol.iterator, iterator-helpers]
 ---*/
 
 var toString = Object.prototype.toString;
@@ -23,3 +23,6 @@ assert.sameValue(toString.call(arrIter), '[object Array Iterator]');
 
 Object.defineProperty(arrIterProto, Symbol.toStringTag, {configurable: true, value: null});
 assert.sameValue(toString.call(arrIter), '[object Object]');
+
+delete arrIterProto[Symbol.toStringTag];
+assert.sameValue(toString.call(arrIter), '[object Iterator]');

test/built-ins/Object/prototype/toString/symbol-tag-generators-builtin.js

@@ -11,7 +11,7 @@ info: |
   15. Let tag be ? Get(O, @@toStringTag).
   16. If Type(tag) is not String, set tag to builtinTag.
   17. Return the string-concatenation of "[object ", tag, and "]".
-features: [Symbol.toStringTag, Symbol.iterator, generators]
+features: [Symbol.toStringTag, Symbol.iterator, generators, iterator-helpers]
 ---*/
 
 var toString = Object.prototype.toString;
@@ -28,3 +28,6 @@ Object.defineProperty(genProto, Symbol.toStringTag, {
   get: function() { return {}; },
 });
 assert.sameValue(toString.call(gen), '[object Object]');
+
+delete genProto[Symbol.toStringTag];
+assert.sameValue(toString.call(gen), '[object Iterator]');

test/built-ins/Object/prototype/toString/symbol-tag-map-builtin.js

@@ -11,7 +11,7 @@ info: |
   15. Let tag be ? Get(O, @@toStringTag).
   16. If Type(tag) is not String, set tag to builtinTag.
   17. Return the string-concatenation of "[object ", tag, and "]".
-features: [Symbol.toStringTag, Symbol.iterator, Map]
+features: [Symbol.toStringTag, Symbol.iterator, Map, iterator-helpers]
 ---*/
 
 var toString = Object.prototype.toString;
@@ -28,3 +28,6 @@ Object.defineProperty(mapIterProto, Symbol.toStringTag, {
   get: function() { return new String('ShouldNotBeUnwrapped'); },
 });
 assert.sameValue(toString.call(mapIter), '[object Object]');
+
+delete mapIterProto[Symbol.toStringTag];
+assert.sameValue(toString.call(mapIter), '[object Iterator]');

test/built-ins/Object/prototype/toString/symbol-tag-promise-builtin.js

@@ -18,3 +18,6 @@ var toString = Object.prototype.toString;
 
 var promise = new Promise(function () {});
 assert.sameValue(toString.call(promise), '[object Promise]');
+
+delete Promise.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(promise), '[object Object]');

test/built-ins/Object/prototype/toString/symbol-tag-set-builtin.js

@@ -11,7 +11,7 @@ info: |
   15. Let tag be ? Get(O, @@toStringTag).
   16. If Type(tag) is not String, set tag to builtinTag.
   17. Return the string-concatenation of "[object ", tag, and "]".
-features: [Symbol.toStringTag, Symbol.iterator, Set]
+features: [Symbol.toStringTag, Symbol.iterator, Set, iterator-helpers]
 ---*/
 
 var toString = Object.prototype.toString;
@@ -28,3 +28,6 @@ Object.defineProperty(setIterProto, Symbol.toStringTag, {
   get: function() { return new String('ShouldNotBeUnwrapped'); },
 });
 assert.sameValue(toString.call(setIter), '[object Object]');
+
+delete setIterProto[Symbol.toStringTag];
+assert.sameValue(toString.call(setIter), '[object Iterator]');

test/built-ins/Object/prototype/toString/symbol-tag-string-builtin.js

@@ -11,7 +11,7 @@ info: |
   15. Let tag be ? Get(O, @@toStringTag).
   16. If Type(tag) is not String, set tag to builtinTag.
   17. Return the string-concatenation of "[object ", tag, and "]".
-features: [Symbol.toStringTag, Symbol.iterator]
+features: [Symbol.toStringTag, Symbol.iterator, iterator-helpers]
 ---*/
 
 var toString = Object.prototype.toString;
@@ -26,3 +26,6 @@ Object.defineProperty(strIterProto, Symbol.toStringTag, {
   get: function() { return new String('ShouldNotBeUnwrapped'); },
 });
 assert.sameValue(toString.call(strIter), '[object Object]');
+
+delete strIterProto[Symbol.toStringTag];
+assert.sameValue(toString.call(strIter), '[object Iterator]');

test/built-ins/Object/prototype/toString/symbol-tag-weakmap-builtin.js

@@ -18,4 +18,4 @@ var toString = Object.prototype.toString;
 
 var wm = new WeakMap();
 delete WeakMap.prototype[Symbol.toStringTag];
-assert.sameValue(toString.call(wm), '[object Object]');
+assert.sameValue(toString.call(wm), '[object Object]');

test/built-ins/Object/prototype/toString/symbol-tag-weakset-builtin.js

@@ -18,4 +18,4 @@ var toString = Object.prototype.toString;
 
 var wm = new WeakSet();
 delete WeakSet.prototype[Symbol.toStringTag];
-assert.sameValue(toString.call(wm), '[object Object]');
+assert.sameValue(toString.call(wm), '[object Object]');