1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/ShadowRealm/extensibility.js b/js/src/tests/test262/built-ins/ShadowRealm/extensibility.js
new file mode 100644
index 0000000000..b5114a4d62
--- /dev/null
+++ b/js/src/tests/test262/built-ins/ShadowRealm/extensibility.js
@@ -0,0 +1,18 @@
+// |reftest| shell-option(--enable-shadow-realms) skip-if(!xulRuntime.shell) -- requires shell-options
+// Copyright (C) 2021 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-shadowrealm-constructor
+description: >
+  The ShadowRealm constructor is extensible
+info: |
+  17 ECMAScript Standard Built-in Objects
+
+  Unless specified otherwise, the [[Extensible]] internal slot of a built-in
+  object initially has the value true.
+features: [ShadowRealm]
+---*/
+
+assert.sameValue(Object.isExtensible(ShadowRealm), true);
+
+reportCompare(0, 0);