1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/toSpliced/start-neg-infinity-is-zero.js b/js/src/tests/test262/built-ins/Array/prototype/toSpliced/start-neg-infinity-is-zero.js
new file mode 100644
index 0000000000..cc025bd98e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/toSpliced/start-neg-infinity-is-zero.js
@@ -0,0 +1,24 @@
+// 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 treats negative Infinity as zero for start.
+info: |
+  Array.prototype.toSpliced ( start, deleteCount, ...items )
+
+  ...
+  2. Let len be ? LengthOfArrayLike(O).
+  3. Let relativeStart be ? ToIntegerOrInfinity(start).
+  4. If relativeStart is -∞, let actualStart be 0.
+  5. Else if relativeStart < 0, let actualStart be max(len + relativeStart, 0).
+  ...
+features: [change-array-by-copy]
+includes: [compareArray.js]
+---*/
+
+var result = [0, 1, 2, 3, 4].toSpliced(-Infinity, 2);
+assert.compareArray(result, [2, 3, 4]);
+
+reportCompare(0, 0);