1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/toSpliced/deleteCount-undefined.js b/js/src/tests/test262/built-ins/Array/prototype/toSpliced/deleteCount-undefined.js
new file mode 100644
index 0000000000..ed1b4dffb7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/toSpliced/deleteCount-undefined.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.toSpliced
+description: Array.prototype.toSpliced(number, undefined) returns a copy of the original array
+info: |
+  22.1.3.25 Array.prototype.toSpliced (start, deleteCount , ...items )
+
+  ...
+  3. Let relativeStart be ? ToIntegerOrInfinity(start).
+  ...
+  6. Else, let actualStart be min(relativeStart, len).
+  ...
+  8. If start is not present, then
+    a. Let actualDeleteCount be 0.
+  9. Else if deleteCount is not present, then
+    a. Let actualDeleteCount be len - actualStart.
+  10. Else,
+    a. Let dc be ? ToIntegerOrInfinity(deleteCount).
+    b. Let actualDeleteCount be the result of clamping dc between 0 and len - actualStart.
+  ...
+features: [change-array-by-copy]
+includes: [compareArray.js]
+---*/
+
+var result = ["first", "second", "third"].toSpliced(1, undefined);
+
+assert.compareArray(result, ["first", "second", "third"]);
+
+reportCompare(0, 0);