1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/flat/null-undefined-elements.js b/js/src/tests/test262/built-ins/Array/prototype/flat/null-undefined-elements.js
new file mode 100644
index 0000000000..8bbf6a4ffa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/flat/null-undefined-elements.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2018 Shilpi Jain and Michael Ficarra. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.flat
+description: >
+    arrays with null, and undefined
+includes: [compareArray.js]
+features: [Array.prototype.flat]
+---*/
+
+var a = [void 0];
+
+assert.compareArray(
+  [1, null, void 0].flat(),
+  [1, null, undefined],
+  '[1, null, void 0].flat() must return [1, null, undefined]'
+);
+assert.compareArray(
+  [1, [null, void 0]].flat(),
+  [1, null, undefined],
+  '[1, [null, void 0]].flat() must return [1, null, undefined]'
+);
+assert.compareArray([
+  [null, void 0],
+  [null, void 0]
+].flat(), [null, undefined, null, undefined], '[ [null, void 0], [null, void 0] ].flat() must return [null, undefined, null, undefined]');
+assert.compareArray([1, [null, a]].flat(1), [1, null, a], '[1, [null, a]].flat(1) must return [1, null, a]');
+assert.compareArray(
+  [1, [null, a]].flat(2),
+  [1, null, undefined],
+  '[1, [null, a]].flat(2) must return [1, null, undefined]'
+);
+
+reportCompare(0, 0);