1 files changed, 48 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/harmony/weakrefs/unregister-inside-cleanup5.js b/deps/v8/test/mjsunit/harmony/weakrefs/unregister-inside-cleanup5.js
new file mode 100644
index 0000000000..974485e9cb
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/weakrefs/unregister-inside-cleanup5.js
@@ -0,0 +1,48 @@
+// Copyright 2018 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(holdings, "holdings");
+
+    // There's one more object with the same key that we haven't
+    // iterated over yet so we should be able to unregister the
+    // callback for that one.
+    let success = fg.unregister(key);
+    assertTrue(success);
+
+    ++cleanup_holdings_count;
+  }
+  ++cleanup_call_count;
+}
+
+let fg = new FinalizationGroup(cleanup);
+// Create an object and register it in the FinalizationGroup. The object needs to be inside
+// a closure so that we can reliably kill them!
+let key = {"k": "this is the key"};
+
+(function() {
+  let object = {};
+  let object2 = {};
+  fg.register(object, "holdings", key);
+  fg.register(object2, "holdings", key);
+
+  // object goes out of scope.
+})();
+
+// This GC will discover dirty WeakCells and schedule cleanup.
+gc();
+assertEquals(0, cleanup_call_count);
+
+// Assert that the cleanup function was called and iterated the WeakCell.
+let timeout_func = function() {
+  assertEquals(1, cleanup_call_count);
+  assertEquals(1, cleanup_holdings_count);
+}
+
+setTimeout(timeout_func, 0);