1 files changed, 81 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-non-str-builtin.js b/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-non-str-builtin.js
new file mode 100644
index 0000000000..851d72ed84
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-non-str-builtin.js
@@ -0,0 +1,81 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-object.prototype.tostring
+description: >
+  Non-string values of `Symbol.toStringTag` property are ignored.
+info: |
+  Object.prototype.toString ( )
+
+  [...]
+  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, WeakMap]
+---*/
+
+var toString = Object.prototype.toString;
+
+delete Symbol.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(Symbol('desc')), '[object Object]');
+
+Object.defineProperty(Math, Symbol.toStringTag, {value: Symbol()});
+assert.sameValue(toString.call(Math), '[object Object]');
+
+var strIter = ''[Symbol.iterator]();
+var strIterProto = Object.getPrototypeOf(strIter);
+assert.sameValue(toString.call(strIter), '[object String Iterator]');
+delete strIterProto[Symbol.toStringTag];
+assert.sameValue(toString.call(strIter), '[object Object]');
+
+var arrIter = [][Symbol.iterator]();
+var arrIterProto = Object.getPrototypeOf(arrIter)
+assert.sameValue(toString.call(arrIter), '[object Array Iterator]');
+Object.defineProperty(arrIterProto, Symbol.toStringTag, {value: null});
+assert.sameValue(toString.call(arrIter), '[object Object]');
+
+var map = new Map();
+delete Map.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(map), '[object Object]');
+
+var mapIter = map[Symbol.iterator]();
+var mapIterProto = Object.getPrototypeOf(mapIter);
+assert.sameValue(toString.call(mapIter), '[object Map Iterator]');
+Object.defineProperty(mapIterProto, Symbol.toStringTag, {
+  get: function() { return new String('ShouldNotBeUnwrapped'); },
+});
+assert.sameValue(toString.call(mapIter), '[object Object]');
+
+var set = new Set();
+delete Set.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(set), '[object Object]');
+
+var setIter = set[Symbol.iterator]();
+var setIterProto = Object.getPrototypeOf(setIter);
+assert.sameValue(toString.call(setIter), '[object Set Iterator]');
+Object.defineProperty(setIterProto, Symbol.toStringTag, {value: false});
+assert.sameValue(toString.call(setIter), '[object Object]');
+
+var wm = new WeakMap();
+delete WeakMap.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(wm), '[object Object]');
+
+var ws = new WeakSet();
+Object.defineProperty(WeakSet.prototype, Symbol.toStringTag, {value: 0});
+assert.sameValue(toString.call(ws), '[object Object]');
+
+delete JSON[Symbol.toStringTag];
+assert.sameValue(toString.call(JSON), '[object Object]');
+
+var gen = (function* () {})();
+var genProto = Object.getPrototypeOf(gen);
+Object.defineProperty(genProto, Symbol.toStringTag, {
+  get: function() { return {}; },
+});
+assert.sameValue(toString.call(gen), '[object Object]');
+
+var promise = new Promise(function() {});
+delete Promise.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(promise), '[object Object]');
+
+reportCompare(0, 0);