1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/this-does-not-have-internal-cells-throws.js b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/this-does-not-have-internal-cells-throws.js
new file mode 100644
index 0000000000..a10e58c01d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/this-does-not-have-internal-cells-throws.js
@@ -0,0 +1,51 @@
+// |reftest| skip-if(!this.hasOwnProperty('FinalizationRegistry')||!this.hasOwnProperty('WeakRef')) -- FinalizationRegistry,WeakRef is not enabled unconditionally
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-finalization-registry.prototype.unregister
+description: Throws a TypeError if this does not have a [[Cells]] internal slot
+info: |
+  FinalizationRegistry.prototype.unregister ( unregisterToken )
+
+  1. Let finalizationRegistry be the this value.
+  2. If Type(finalizationRegistry) is not Object, throw a TypeError exception.
+  3. If finalizationRegistry does not have a [[Cells]] internal slot, throw a TypeError exception.
+  4. If Type(unregisterToken) is not Object, throw a TypeError exception.
+  ...
+features: [WeakSet, WeakMap, FinalizationRegistry, WeakRef]
+---*/
+
+assert.sameValue(typeof FinalizationRegistry.prototype.unregister, 'function');
+
+var unregister = FinalizationRegistry.prototype.unregister;
+var token = {};
+
+assert.throws(TypeError, function() {
+  unregister.call({ ['[[Cells]]']: {} }, token);
+}, 'Ordinary object without [[Cells]]');
+
+assert.throws(TypeError, function() {
+  unregister.call(WeakRef.prototype, token);
+}, 'WeakRef.prototype does not have a [[Cells]] internal slot');
+
+assert.throws(TypeError, function() {
+  unregister.call(WeakRef, token);
+}, 'WeakRef does not have a [[Cells]] internal slot');
+
+var wr = new WeakRef({});
+assert.throws(TypeError, function() {
+  unregister.call(wr, token);
+}, 'WeakRef instance');
+
+var wm = new WeakMap();
+assert.throws(TypeError, function() {
+  unregister.call(wm, token);
+}, 'WeakMap instance');
+
+var ws = new WeakSet();
+assert.throws(TypeError, function() {
+  unregister.call(ws, token);
+}, 'WeakSet instance');
+
+reportCompare(0, 0);