1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/construct/trap-is-undefined-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/construct/trap-is-undefined-target-is-proxy.js
new file mode 100644
index 0000000000..068159253c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/construct/trap-is-undefined-target-is-proxy.js
@@ -0,0 +1,48 @@
+// 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-construct-argumentslist-newtarget
+description: >
+  If "construct" trap is null or undefined, [[Construct]] call is
+  properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[Construct]] ( argumentsList, newTarget )
+
+  [...]
+  4. Let target be O.[[ProxyTarget]].
+  5. Assert: IsConstructor(target) is true.
+  6. Let trap be ? GetMethod(handler, "construct").
+  7. If trap is undefined, then
+    a. Return ? Construct(target, argumentsList, newTarget).
+features: [class, Proxy, Reflect, Reflect.construct]
+---*/
+
+class Foo {
+  constructor(a, b) {
+    this.sum = a + b;
+  }
+}
+
+var FooBound = Foo.bind(null, 1);
+var FooTarget = new Proxy(FooBound, {});
+var FooProxy = new Proxy(FooTarget, {
+  construct: undefined,
+});
+
+var foo = new FooBound(2);
+assert(foo instanceof Foo);
+assert.sameValue(foo.sum, 3);
+
+class Bar extends Foo {
+  get isBar() {
+    return true;
+  }
+}
+
+var bar = Reflect.construct(FooProxy, [3], Bar);
+assert(bar instanceof Bar);
+assert.sameValue(bar.sum, 4);
+assert(bar.isBar);
+
+reportCompare(0, 0);