1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/WeakSet/prototype/has/returns-false-when-symbol-value-not-present.js b/js/src/tests/test262/built-ins/WeakSet/prototype/has/returns-false-when-symbol-value-not-present.js
new file mode 100644
index 0000000000..8c7c103a56
--- /dev/null
+++ b/js/src/tests/test262/built-ins/WeakSet/prototype/has/returns-false-when-symbol-value-not-present.js
@@ -0,0 +1,29 @@
+// |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-weakset.prototype.has
+description: >
+  Return false when a Symbol value is not present in the WeakSet entries.
+info: |
+  WeakSet.prototype.has ( _value_ )
+  6. Return *false*.
+features: [Symbol, WeakSet, symbols-as-weakmap-keys]
+---*/
+
+var foo = Symbol('a description');
+var bar = Symbol('a description');
+var s = new WeakSet();
+
+assert.sameValue(s.has(foo), false, 'Set is initially empty of regular symbol');
+assert.sameValue(s.has(Symbol.hasInstance), false, 'Set is initially empty of well-known symbol');
+
+s.add(foo);
+assert.sameValue(s.has(bar), false, 'Symbols with the same description are not aliased to each other');
+
+s.delete(foo);
+assert.sameValue(s.has(foo), false, 'Set is again empty of regular symbol after deleting');
+s.delete(Symbol.hasInstance);
+assert.sameValue(s.has(Symbol.hasInstance), false, 'Set is again empty of well-known symbol after deleting');
+
+reportCompare(0, 0);