1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/getPrototypeOf/trap-is-undefined-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/getPrototypeOf/trap-is-undefined-target-is-proxy.js
new file mode 100644
index 0000000000..00146ad19e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/getPrototypeOf/trap-is-undefined-target-is-proxy.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-proxy-object-internal-methods-and-internal-slots-getprototypeof
+description: >
+  If "getPrototypeOf" trap is null or undefined, [[GetPrototypeOf]] call
+  is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[GetPrototypeOf]] ( )
+
+  [...]
+  4. Let target be O.[[ProxyTarget]].
+  5. Let trap be ? GetMethod(handler, "getPrototypeOf").
+  6. If trap is undefined, then
+    a. Return ? target.[[GetPrototypeOf]]()
+features: [Proxy]
+---*/
+
+var arrayTarget = new Proxy([], {});
+var arrayProxy = new Proxy(arrayTarget, {
+  getPrototypeOf: undefined,
+});
+
+assert.sameValue(Object.getPrototypeOf(arrayProxy), Array.prototype);
+
+reportCompare(0, 0);