1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/JSON/stringify/replacer-array-undefined.js b/js/src/tests/test262/built-ins/JSON/stringify/replacer-array-undefined.js
new file mode 100644
index 0000000000..1f2a176f34
--- /dev/null
+++ b/js/src/tests/test262/built-ins/JSON/stringify/replacer-array-undefined.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2019 Aleksey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-json.stringify
+description: >
+  Undefined values in replacer array are ignored.
+info: |
+  JSON.stringify ( value [ , replacer [ , space ] ] )
+
+  [...]
+  4. If Type(replacer) is Object, then
+    [...]
+    4. Repeat, while k < len,
+      a. Let v be ? Get(replacer, ! ToString(k)).
+      [...]
+      f. If item is not undefined and item is not currently an element of PropertyList, then
+        i. Append item to the end of PropertyList.
+---*/
+
+assert.sameValue(JSON.stringify({undefined: 1}, [undefined]), '{}');
+assert.sameValue(JSON.stringify({key: 1, undefined: 2}, [,,,]), '{}');
+
+var sparse = new Array(3);
+sparse[1] = 'key';
+
+assert.sameValue(
+  JSON.stringify({undefined: 1, key: 2}, sparse),
+  '{"key":2}'
+);
+
+reportCompare(0, 0);