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diff --git a/js/src/tests/test262/prs/3994/built-ins/Uint8Array/prototype/setFromHex/shell.js b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/prototype/setFromHex/shell.js
new file mode 100644
index 0000000000..a7590326c3
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+++ b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/prototype/setFromHex/shell.js
@@ -0,0 +1,42 @@
+// GENERATED, DO NOT EDIT
+// file: detachArrayBuffer.js
+// Copyright (C) 2016 the V8 project authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    A function used in the process of asserting correctness of TypedArray objects.
+
+    $262.detachArrayBuffer is defined by a host.
+defines: [$DETACHBUFFER]
+---*/
+
+function $DETACHBUFFER(buffer) {
+  if (!$262 || typeof $262.detachArrayBuffer !== "function") {
+    throw new Test262Error("No method available to detach an ArrayBuffer");
+  }
+  $262.detachArrayBuffer(buffer);
+}
+
+// file: isConstructor.js
+// Copyright (C) 2017 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+    Test if a given function is a constructor function.
+defines: [isConstructor]
+features: [Reflect.construct]
+---*/
+
+function isConstructor(f) {
+    if (typeof f !== "function") {
+      throw new Test262Error("isConstructor invoked with a non-function value");
+    }
+
+    try {
+        Reflect.construct(function(){}, [], f);
+    } catch (e) {
+        return false;
+    }
+    return true;
+}