1 files changed, 50 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/harmony/weakrefs/unregister-many.js b/deps/v8/test/mjsunit/harmony/weakrefs/unregister-many.js
new file mode 100644
index 0000000000..748b7065c6
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/weakrefs/unregister-many.js
@@ -0,0 +1,50 @@
+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-weak-refs --expose-gc --noincremental-marking
+
+let cleanup_call_count = 0;
+let cleanup_holdings_count = 0;
+let cleanup = function(iter) {
+  for (holdings of iter) {
+    assertEquals("holdings2", holdings);
+    ++cleanup_holdings_count;
+  }
+  ++cleanup_call_count;
+}
+
+let fg = new FinalizationGroup(cleanup);
+let key1 = {"k": "key1"};
+let key2 = {"k": "key2"};
+// Create three objects and register them in the FinalizationGroup. The objects
+// need to be inside a closure so that we can reliably kill them!
+
+(function() {
+  let object1a = {};
+  fg.register(object1a, "holdings1a", key1);
+
+  let object1b = {};
+  fg.register(object1b, "holdings1b", key1);
+
+  let object2 = {};
+  fg.register(object2, "holdings2", key2);
+
+  // Unregister before the GC has a chance to discover the objects.
+  fg.unregister(key1);
+
+  // objects go out of scope.
+})();
+
+// This GC will reclaim the target objects.
+gc();
+assertEquals(0, cleanup_call_count);
+
+// Assert that the cleanup function will be called only for the reference which
+// was not unregistered.
+let timeout_func = function() {
+  assertEquals(1, cleanup_call_count);
+  assertEquals(1, cleanup_holdings_count);
+}
+
+setTimeout(timeout_func, 0);