1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArrayConstructors/from/BigInt/custom-ctor-returns-other-instance.js b/js/src/tests/test262/built-ins/TypedArrayConstructors/from/BigInt/custom-ctor-returns-other-instance.js
new file mode 100644
index 0000000000..616faeccbe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArrayConstructors/from/BigInt/custom-ctor-returns-other-instance.js
@@ -0,0 +1,54 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-%typedarray%.from
+description: >
+  Custom constructor can return any TypedArray instance with higher or same
+  length
+info: |
+  %TypedArray%.from ( source [ , mapfn [ , thisArg ] ] )
+
+  ...
+  7. If usingIterator is not undefined, then
+    a. Let values be ? IterableToList(source, usingIterator).
+    b. Let len be the number of elements in values.
+    c. Let targetObj be ? TypedArrayCreate(C, «len»).
+  ...
+  10. Let len be ? ToLength(? Get(arrayLike, "length")).
+  11. Let targetObj be ? TypedArrayCreate(C, « len »).
+  ...
+includes: [testBigIntTypedArray.js]
+features: [BigInt, Symbol.iterator, TypedArray]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var sourceItor = [1n, 2n];
+  var sourceObj = {
+    0: 0n,
+    1: 0n,
+    length: 2
+  };
+
+  var result;
+  var custom = new TA(2);
+  var ctor = function() {
+    return custom;
+  };
+
+  result = TypedArray.from.call(ctor, sourceItor);
+  assert.sameValue(result, custom, "using iterator, same length");
+
+  result = TypedArray.from.call(ctor, sourceObj);
+  assert.sameValue(result, custom, "not using iterator, same length");
+
+  custom = new TA(3);
+
+  result = TypedArray.from.call(ctor, sourceItor);
+  assert.sameValue(result, custom, "using iterator, higher length");
+
+  result = TypedArray.from.call(ctor, sourceObj);
+  assert.sameValue(result, custom, "not using iterator, higher length");
+});
+
+reportCompare(0, 0);