1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/WeakRef/prototype-from-newtarget.js b/js/src/tests/test262/built-ins/WeakRef/prototype-from-newtarget.js
new file mode 100644
index 0000000000..695d020129
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+++ b/js/src/tests/test262/built-ins/WeakRef/prototype-from-newtarget.js
@@ -0,0 +1,37 @@
+// |reftest| skip-if(!this.hasOwnProperty('WeakRef')) -- WeakRef is not enabled unconditionally
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-weak-ref-target
+description: >
+  The [[Prototype]] internal slot is computed from NewTarget.
+info: |
+  WeakRef ( target )
+
+  ...
+  3. Let weakRef be ? OrdinaryCreateFromConstructor(NewTarget,  "%WeakRefPrototype%", « [[Target]] »).
+  4. Perfom ! KeepDuringJob(target).
+  5. Set weakRef.[[Target]] to target.
+  6. Return weakRef.
+
+  OrdinaryCreateFromConstructor ( constructor, intrinsicDefaultProto [ , internalSlotsList ] )
+
+  ...
+  2. Let proto be ? GetPrototypeFromConstructor(constructor, intrinsicDefaultProto).
+  3. Return ObjectCreate(proto, internalSlotsList).
+
+  GetPrototypeFromConstructor ( constructor, intrinsicDefaultProto )
+
+  3. Let proto be ? Get(constructor, 'prototype').
+  4. If Type(proto) is not Object, then
+    a. Let realm be ? GetFunctionRealm(constructor).
+    b. Set proto to realm's intrinsic object named intrinsicDefaultProto.
+  5. Return proto.
+features: [WeakRef]
+---*/
+
+var wr = new WeakRef({});
+assert.sameValue(Object.getPrototypeOf(wr), WeakRef.prototype);
+
+reportCompare(0, 0);