1 files changed, 57 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/unregister-object-token.js b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/unregister-object-token.js
new file mode 100644
index 0000000000..0dd685e4b8
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+++ b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/unregister/unregister-object-token.js
@@ -0,0 +1,57 @@
+// |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: >
+  Return boolean values indicating unregistering of values with Object token
+info: |
+  FinalizationRegistry.prototype.unregister ( _unregisterToken_ )
+  4. Let _removed_ be *false*.
+  5. For each Record { [[WeakRefTarget]], [[HeldValue]], [[UnregisterToken]] }
+    _cell_ of _finalizationRegistry_.[[Cells]], do
+    a. If _cell_.[[UnregisterToken]] is not ~empty~ and
+      SameValue(_cell_.[[UnregisterToken]], _unregisterToken_) is *true*, then
+      i. Remove _cell_ from _finalizationRegistry_.[[Cells]].
+      ii. Set _removed_ to *true*.
+  6. Return _removed_.
+features: [FinalizationRegistry]
+---*/
+
+var fn = function() {};
+var finalizationRegistry = new FinalizationRegistry(fn);
+
+var target1 = {};
+var target2 = {};
+var target3 = {};
+var token1 = {};
+var token2 = {};
+
+assert.sameValue(finalizationRegistry.unregister(token1), false, 'unregistering token1 from empty finalizationRegistry');
+assert.sameValue(finalizationRegistry.unregister(token2), false, 'unregistering token2 from empty finalizationRegistry');
+
+finalizationRegistry.register(target1, undefined, token1);
+finalizationRegistry.register(target1, undefined, token1); // Repeat registering un purpose
+finalizationRegistry.register(target2, undefined, token2);
+finalizationRegistry.register(target3, undefined, token2);
+
+assert.sameValue(finalizationRegistry.unregister(target1), false, 'own target does not work on unregister, #1');
+assert.sameValue(finalizationRegistry.unregister(target2), false, 'own target does not work on unregister, #2');
+assert.sameValue(finalizationRegistry.unregister(target3), false, 'own target does not work on unregister, #3');
+
+assert.sameValue(finalizationRegistry.unregister(token1), true, 'unregistering token1 from finalizationRegistry');
+assert.sameValue(finalizationRegistry.unregister(token1), false, 'unregistering token1 again from finalizationRegistry');
+assert.sameValue(finalizationRegistry.unregister(token2), true, 'unregistering token2 to remove target2 and target3');
+assert.sameValue(finalizationRegistry.unregister(token2), false, 'unregistering token2 from empty finalizationRegistry');
+
+// Notice these assertions take advantage of adding targets previously added with a token,
+// but now they got no token so it won't be used to remove them.
+finalizationRegistry.register(target1, token1); // holdings, not unregisterToken
+finalizationRegistry.register(target2, token2); // holdings, not unregisterToken
+finalizationRegistry.register(target3);
+
+assert.sameValue(finalizationRegistry.unregister(token1), false, 'nothing to remove without a set unregisterToken #1');
+assert.sameValue(finalizationRegistry.unregister(token2), false, 'nothing to remove without a set unregisterToken #2');
+
+reportCompare(0, 0);