1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/WeakMap/prototype/has/returns-false-when-symbol-key-not-present.js b/js/src/tests/test262/built-ins/WeakMap/prototype/has/returns-false-when-symbol-key-not-present.js
new file mode 100644
index 0000000000..5f379d685a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/WeakMap/prototype/has/returns-false-when-symbol-key-not-present.js
@@ -0,0 +1,31 @@
+// |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.has
+description: >
+  Return false when a Symbol key is not present in the WeakMap entries.
+info: |
+  WeakMap.prototype.has ( _key_ )
+  6. Return *false*.
+features: [Symbol, WeakMap, symbols-as-weakmap-keys]
+---*/
+
+var foo = Symbol('a description');
+var bar = Symbol('a description');
+var map = new WeakMap();
+
+assert.sameValue(map.has(foo), false, 'Map is initially empty of regular symbol');
+assert.sameValue(map.has(Symbol.hasInstance), false, 'Map is initially empty of well-known symbol');
+
+map.set(foo, 1);
+assert.sameValue(map.has(bar), false, "Symbols with the same description don't alias each other");
+
+map.delete(foo);
+assert.sameValue(map.has(foo), false, 'Map is empty again of regular symbol after deleting');
+
+map.set(Symbol.hasInstance, 2);
+map.delete(Symbol.hasInstance);
+assert.sameValue(map.has(Symbol.hasInstance), false, 'Map is empty again of well-known symbol after deleting');
+
+reportCompare(0, 0);