1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/fill/absent-indices-computed-from-initial-length.js b/js/src/tests/test262/built-ins/TypedArray/prototype/fill/absent-indices-computed-from-initial-length.js
new file mode 100644
index 0000000000..e2ae779081
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/fill/absent-indices-computed-from-initial-length.js
@@ -0,0 +1,54 @@
+// |reftest| shell-option(--enable-arraybuffer-resizable) skip-if(!ArrayBuffer.prototype.resize||!xulRuntime.shell) -- resizable-arraybuffer is not enabled unconditionally, requires shell-options
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-%typedarray%.prototype.fill
+description: >
+  Absent start and end parameters are computed from initial length.
+info: |
+  %TypedArray%.prototype.fill ( value [ , start [ , end ] ] )
+
+  ...
+  2. Let taRecord be ? ValidateTypedArray(O, seq-cst).
+  3. Let len be TypedArrayLength(taRecord).
+  ...
+  5. Otherwise, set value to ? ToNumber(value).
+  6. Let relativeStart be ? ToIntegerOrInfinity(start).
+  ...
+  9. Else, let startIndex be min(relativeStart, len).
+  10. If end is undefined, let relativeEnd be len; else let relativeEnd be ? ToIntegerOrInfinity(end).
+  ...
+  13. Else, let endIndex be min(relativeEnd, len).
+  ...
+
+features: [TypedArray, resizable-arraybuffer]
+---*/
+
+let rab = new ArrayBuffer(1, {maxByteLength: 4});
+let ta = new Int8Array(rab);
+
+let value = {
+  valueOf() {
+    // Set buffer to maximum byte length.
+    rab.resize(4);
+
+    // Return the fill value.
+    return 123;
+  }
+};
+
+// Ensure typed array is correctly initialised.
+assert.sameValue(ta.length, 1);
+assert.sameValue(ta[0], 0);
+
+ta.fill(value);
+
+// Ensure typed array has correct length and only the first element was filled.
+assert.sameValue(ta.length, 4);
+assert.sameValue(ta[0], 123);
+assert.sameValue(ta[1], 0);
+assert.sameValue(ta[2], 0);
+assert.sameValue(ta[3], 0);
+
+reportCompare(0, 0);