diff --git a/test/built-ins/Realm/prototype/evaluate/validates-realm-object.js b/test/built-ins/Realm/prototype/evaluate/validates-realm-object.js
new file mode 100644
index 0000000000..1f024de931
--- /dev/null
+++ b/test/built-ins/Realm/prototype/evaluate/validates-realm-object.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-realm.prototype.evaluate
+description: >
+  Realm.prototype.evaluate validates realm object.
+includes: [isConstructor.js]
+features: [callable-boundary-realms]
+---*/
+
+assert.sameValue(
+  typeof Realm.prototype.evaluate,
+  'function',
+  'This test must fail if Realm.prototype.evaluate is not a function'
+);
+
+const r = new Realm();
+const bogus = {};
+
+assert.throws(TypeError, function() {
+  r.evaluate.call(bogus);
+}, 'throws a TypeError if this is not a Realm object');
\ No newline at end of file