1 files changed, 31 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/harmony/array-flat-species.js b/deps/v8/test/mjsunit/harmony/array-flat-species.js
new file mode 100644
index 0000000000..d04f8a0875
--- /dev/null
+++ b/deps/v8/test/mjsunit/harmony/array-flat-species.js
@@ -0,0 +1,31 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-array-flat
+
+{
+  class MyArray extends Array {
+    static get [Symbol.species]() {
+      return Array;
+    }
+  }
+
+  const wannabe = new MyArray();
+  const flattened = wannabe.flat(Infinity);
+  assertEquals(false, flattened instanceof MyArray);
+  assertEquals(true, flattened instanceof Array);
+}
+
+{
+  class MyArray extends Array {
+    static get [Symbol.species]() {
+      return this;
+    }
+  }
+
+  const wannabe = new MyArray();
+  const flattened = wannabe.flat(Infinity);
+  assertEquals(true, flattened instanceof MyArray);
+  assertEquals(true, flattened instanceof Array);
+}