1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/register/throws-when-unregisterToken-not-undefined-and-cannot-be-held-weakly.js b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/register/throws-when-unregisterToken-not-undefined-and-cannot-be-held-weakly.js
new file mode 100644
index 0000000000..6f7853a439
--- /dev/null
+++ b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/register/throws-when-unregisterToken-not-undefined-and-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.register
+description: >
+  Throws a TypeError if unregisterToken is not undefined and cannot be held
+  weakly
+info: |
+  FinalizationRegistry.prototype.register ( _target_ , _heldValue_ [, _unregisterToken_ ] )
+  5. If CanBeHeldWeakly(_unregisterToken_) is *false*, then
+    a. If _unregisterToken_ is not *undefined*, throw a *TypeError* exception.
+features: [FinalizationRegistry]
+---*/
+
+assert.sameValue(typeof FinalizationRegistry.prototype.register, 'function');
+
+var finalizationRegistry = new FinalizationRegistry(function() {});
+var target = {};
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.register(target, undefined, null);
+}, 'null');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.register(target, undefined, true);
+}, 'true');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.register(target, undefined, false);
+}, 'false');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.register(target, undefined, 1);
+}, 'number');
+
+assert.throws(TypeError, function() {
+  finalizationRegistry.register(target, undefined, 'object');
+}, 'string');
+
+var s = Symbol.for('registered symbol');
+assert.throws(TypeError, function() {
+  finalizationRegistry.register(target, undefined, s);
+}, 'registered symbol');
+
+reportCompare(0, 0);