v8/test/mjsunit/harmony/array-sort-comparefn.js

// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Array.prototype.sort + TypedArray.prototype.sort: comparefn must be either a
// function or undefined.
// https://github.com/tc39/ecma262/pull/785

const types = [
  Array,
  Int8Array, Uint8Array,
  Int16Array, Uint16Array,
  Int32Array, Uint32Array,
  Uint8ClampedArray,
  Float32Array, Float64Array,
];

for (const type of types) {
  const array = new type();
  array[0] = 1;
  array[1] = 2;
  array[2] = 3;

  array.sort();
  array.sort(undefined);
  array.sort(() => {});

  assertThrows(() => { array.sort(null);     }, TypeError);
  assertThrows(() => { array.sort(true);     }, TypeError);
  assertThrows(() => { array.sort(false);    }, TypeError);
  assertThrows(() => { array.sort('');       }, TypeError);
  assertThrows(() => { array.sort(0);        }, TypeError);
  assertThrows(() => { array.sort(42);       }, TypeError);
  assertThrows(() => { array.sort([]);       }, TypeError);
  assertThrows(() => { array.sort(/./);      }, TypeError);
  assertThrows(() => { array.sort({});       }, TypeError);
  assertThrows(() => { array.sort(Symbol()); }, TypeError);
}

assertThrows(() => { Array.prototype.sort.call(null, 42); }, TypeError);
try {
  Array.prototype.sort.call(null, 42);
} catch (exception) {
  assertEquals(
    'The comparison function must be either a function or undefined',
    exception.message
  );
}