1 files changed, 46 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-non-str-bigint.js b/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-non-str-bigint.js
new file mode 100644
index 0000000000..e9c31905ad
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/prototype/toString/symbol-tag-non-str-bigint.js
@@ -0,0 +1,46 @@
+// Copyright (C) 2018 Igalia, S.L. 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 `@@toStringTag` property are ignored
+info: |
+    14. Else, let builtinTag be "Object".
+    15. Let tag be ? Get(O, @@toStringTag).
+    16. If Type(tag) is not String, let tag be builtinTag.
+    17. Return the string-concatenation of "[object ", tag, and "]".
+features: [BigInt, Symbol.toStringTag]
+---*/
+
+let custom1 = BigInt(0);
+let custom2 = Object(BigInt(0));
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: undefined});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: null});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: Symbol.toStringTag});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: 86});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: new String('test262')});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: {}});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+Object.defineProperty(BigInt.prototype, Symbol.toStringTag, {value: _ => 'str'});
+assert.sameValue(Object.prototype.toString.call(custom1), '[object Object]');
+assert.sameValue(Object.prototype.toString.call(custom2), '[object Object]');
+
+reportCompare(0, 0);