1 files changed, 23 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-weakmap-builtin.js b/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-weakmap-builtin.js
new file mode 100644
index 0000000000..29d51c0288
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-weakmap-builtin.js
@@ -0,0 +1,23 @@
+// 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, WeakMap]
+---*/
+
+var toString = Object.prototype.toString;
+
+var wm = new WeakMap();
+delete WeakMap.prototype[Symbol.toStringTag];
+assert.sameValue(toString.call(wm), '[object Object]');
+
+reportCompare(0, 0);