1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/WeakMap/prototype/delete/returns-false-when-symbol-key-not-present.js b/js/src/tests/test262/built-ins/WeakMap/prototype/delete/returns-false-when-symbol-key-not-present.js
new file mode 100644
index 0000000000..873b481212
--- /dev/null
+++ b/js/src/tests/test262/built-ins/WeakMap/prototype/delete/returns-false-when-symbol-key-not-present.js
@@ -0,0 +1,25 @@
+// |reftest| shell-option(--enable-symbols-as-weakmap-keys) skip-if(release_or_beta||!xulRuntime.shell) -- symbols-as-weakmap-keys is not released yet, requires shell-options
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-weakmap.prototype.delete
+description: >
+  Return false if a Symbol key is not in the WeakMap.
+info: |
+  WeakMap.prototype.delete ( _key_ )
+  6. Return *false*.
+features: [Symbol, WeakMap, symbols-as-weakmap-keys]
+---*/
+
+var map = new WeakMap();
+var foo = Symbol('a description');
+var bar = Symbol('a description');
+var baz = Symbol('another description');
+
+map.set(foo, 42);
+
+assert.sameValue(map.delete(baz), false, 'Regular symbol key not present')
+assert.sameValue(map.delete(bar), false, "Symbols with the same description don't alias to each other");
+assert.sameValue(map.delete(Symbol.hasInstance), false, 'Well-known symbol key not present');
+
+reportCompare(0, 0);