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diff --git a/js/src/tests/test262/built-ins/WeakMap/is-a-constructor.js b/js/src/tests/test262/built-ins/WeakMap/is-a-constructor.js
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+++ b/js/src/tests/test262/built-ins/WeakMap/is-a-constructor.js
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+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  The WeakMap constructor implements [[Construct]]
+info: |
+  IsConstructor ( argument )
+
+  The abstract operation IsConstructor takes argument argument (an ECMAScript language value).
+  It determines if argument is a function object with a [[Construct]] internal method.
+  It performs the following steps when called:
+
+  If Type(argument) is not Object, return false.
+  If argument has a [[Construct]] internal method, return true.
+  Return false.
+includes: [isConstructor.js]
+features: [Reflect.construct, WeakMap]
+---*/
+
+assert.sameValue(isConstructor(WeakMap), true, 'isConstructor(WeakMap) must return true');
+new WeakMap();
+  
+
+reportCompare(0, 0);