Add coverage for byteOffset with detached buffer in TypedArray.prototype.subarray

JSC doesn't handle this case correctly.

Author: anba

test/built-ins/TypedArray/prototype/subarray/byteoffset-with-detached-buffer.js

@@ -0,0 +1,45 @@
+// Copyright (C) 2025 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-%typedarray%.prototype.subarray
+description: >
+  Species constructor is called with the correct byte-offset value
+info: |
+  %TypedArray%.prototype.subarray ( start, end )
+
+  ...
+  13. Let srcByteOffset be O.[[ByteOffset]].
+  14. Let beginByteOffset be srcByteOffset + (startIndex × elementSize).
+  ...
+  16. Else,
+    ...
+    f. Let argumentsList be « buffer, 𝔽(beginByteOffset), 𝔽(newLength) ».
+  17. Return ? TypedArraySpeciesCreate(O, argumentsList).
+features: [TypedArray]
+includes: [testTypedArray.js, detachArrayBuffer.js]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var ab = new ArrayBuffer(2 * TA.BYTES_PER_ELEMENT);
+  var ta = new TA(ab, TA.BYTES_PER_ELEMENT, 1);
+  var result = new TA(0);
+
+  ta.constructor = {
+    [Symbol.species]: function(buffer, byteOffset, length) {
+      assert.sameValue(buffer, ab);
+      assert.sameValue(byteOffset, 2 * TA.BYTES_PER_ELEMENT);
+      assert.sameValue(length, 0);
+      return result;
+    }
+  };
+
+  var end = {
+    valueOf() {
+      $DETACHBUFFER(ab);
+      return 0;
+    }
+  };
+
+  assert.sameValue(ta.subarray(1, end), result);
+});