JSTests/test262/test/built-ins/TypedArray/prototype/reduce/callbackfn-detachbuffer.js

// 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%.prototype.reduce
description: >
  Instance buffer can be detached during loop
info: |
  22.2.3.20 %TypedArray%.prototype.reduce ( callbackfn [ , initialValue ] )

  %TypedArray%.prototype.reduce is a distinct function that implements the same
  algorithm as Array.prototype.reduce as defined in 22.1.3.19 except that the
  this object's [[ArrayLength]] internal slot is accessed in place of performing
  a [[Get]] of "length".

  22.1.3.19 Array.prototype.reduce ( callbackfn [ , initialValue ] )

  ...
  8. Repeat, while k < len
    ...
    c. If kPresent is true, then
      ...
      i. Let accumulator be ? Call(callbackfn, undefined, « accumulator, kValue,
      k, O »).
  ...
includes: [detachArrayBuffer.js, testTypedArray.js]
features: [TypedArray]
---*/

testWithTypedArrayConstructors(function(TA) {
  var loops = 0;
  var sample = new TA(2);

  assert.throws(TypeError, function() {
    sample.reduce(function() {
      if (loops === 1) {
        throw new Test262Error("callbackfn called twice");
      }
      $DETACHBUFFER(sample.buffer);
      loops++;
    }, 0);
  });

  assert.sameValue(loops, 1, "callbackfn called only once");
});