1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/throws-when-unregisterToken-cannot-be-held-weakly.js b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/throws-when-unregisterToken-cannot-be-held-weakly.js
new file mode 100644
index 0000000000..403b569d5a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/throws-when-unregisterToken-cannot-be-held-weakly.js
@@ -0,0 +1,47 @@
+// |reftest| skip-if(!this.hasOwnProperty('FinalizationRegistry')) -- FinalizationRegistry 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 unregisterToken cannot be held weakly
+info: |
+  FinalizationRegistry.prototype.unregister ( _unregisterToken_ )
+  3. If CanBeHeldWeakly(_unregisterToken_) is *false*, throw a *TypeError* exception.
+features: [FinalizationRegistry]
+---*/
+
+assert.sameValue(typeof FinalizationRegistry.prototype.unregister, 'function');
+
+var finalizationRegistry = new FinalizationRegistry(function() {});
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister(null);
+}, 'null');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister(true);
+}, 'true');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister(false);
+}, 'false');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister(1);
+}, 'number');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister('object');
+}, 'string');
+
+var s = Symbol.for('registered symbol');
+assert.throws(TypeError, function() {
+  finalizationRegistry.unregister(s);
+}, 'registered symbol');
+
+reportCompare(0, 0);