1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/register/unregisterToken-same-as-target.js b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/register/unregisterToken-same-as-target.js
new file mode 100644
index 0000000000..bfe567cf50
--- /dev/null
+++ b/js/src/tests/test262/built-ins/FinalizationRegistry/prototype/register/unregisterToken-same-as-target.js
@@ -0,0 +1,29 @@
+// |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: unregisterToken may be the same as target
+info: |
+  FinalizationRegistry.prototype.register ( target , holdings [, unregisterToken ] )
+
+  1. Let finalizationRegistry be the this value.
+  2. If Type(finalizationRegistry) is not Object, throw a TypeError exception.
+  3. If Type(target) is not Object, throw a TypeError exception.
+  4. If finalizationRegistry does not have a [[Cells]] internal slot, throw a TypeError exception.
+  5. If Type(unregisterToken) is not Object,
+    a. If unregisterToken is not undefined, throw a TypeError exception.
+    b. Set unregisterToken to empty.
+  6. Let cell be the Record { [[Target]] : target, [[Holdings]]: holdings, [[UnregisterToken]]: unregisterToken }.
+  7. Append cell to finalizationRegistry.[[Cells]].
+  8. Return undefined.
+features: [FinalizationRegistry]
+---*/
+
+var finalizationRegistry = new FinalizationRegistry(function() {});
+
+var target = {};
+assert.sameValue(finalizationRegistry.register(target, '1', target), undefined);
+
+reportCompare(0, 0);