1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/has/trap-is-undefined-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/has/trap-is-undefined-target-is-proxy.js
new file mode 100644
index 0000000000..270a17e158
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/has/trap-is-undefined-target-is-proxy.js
@@ -0,0 +1,47 @@
+// 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-hasproperty-p
+description: >
+  If "has" trap is null or undefined, [[HasProperty]] call is properly
+  forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[HasProperty]] ( P )
+
+  [...]
+  5. Let target be O.[[ProxyTarget]].
+  6. Let trap be ? GetMethod(handler, "has").
+  7. If trap is undefined, then
+    a. Return ? target.[[HasProperty]](P).
+features: [Proxy, Reflect]
+---*/
+
+var plainObject = {
+  get 0() {
+    return 1;
+  },
+  foo: 2,
+  set bar(_value) {},
+};
+
+var plainObjectTarget = new Proxy(plainObject, {});
+var plainObjectProxy = new Proxy(plainObjectTarget, {
+  get: undefined,
+});
+
+assert(0 in Object.create(plainObjectProxy));
+assert("foo" in plainObjectProxy);
+assert(Reflect.has(plainObjectProxy, "bar"));
+
+
+var arrayTarget = new Proxy([1, 2], {});
+var arrayProxy = new Proxy(arrayTarget, {
+  get: undefined,
+});
+
+assert("length" in Object.create(arrayProxy));
+assert("1" in arrayProxy);
+assert(!("2" in arrayProxy));
+
+reportCompare(0, 0);