JSTests/test262/test/built-ins/Array/prototype/includes/tointeger-fromindex.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-array.prototype.includes
description: get the integer value from fromIndex
info: |
  22.1.3.11 Array.prototype.includes ( searchElement [ , fromIndex ] )

  ...
  4. Let n be ? ToInteger(fromIndex). (If fromIndex is undefined, this step
  produces the value 0.)
  5. If n ≥ 0, then
    a. Let k be n.
  ...
  7. Repeat, while k < len
    a. Let elementK be the result of ? Get(O, ! ToString(k)).
    b. If SameValueZero(searchElement, elementK) is true, return true.
    c. Increase k by 1.
  8. Return false.
---*/

var obj = {
  valueOf: function() {
    return 1;
  }
};

var sample = [42, 43];
assert.sameValue(sample.includes(42, "1"), false, "string [0]");
assert.sameValue(sample.includes(43, "1"), true, "string [1]");

assert.sameValue(sample.includes(42, true), false, "true [0]");
assert.sameValue(sample.includes(43, true), true, "true [1]");

assert.sameValue(sample.includes(42, false), true, "false [0]");
assert.sameValue(sample.includes(43, false), true, "false [1]");

assert.sameValue(sample.includes(42, NaN), true, "NaN [0]");
assert.sameValue(sample.includes(43, NaN), true, "NaN [1]");

assert.sameValue(sample.includes(42, null), true, "null [0]");
assert.sameValue(sample.includes(43, null), true, "null [1]");

assert.sameValue(sample.includes(42, undefined), true, "undefined [0]");
assert.sameValue(sample.includes(43, undefined), true, "undefined [1]");

assert.sameValue(sample.includes(42, null), true, "null [0]");
assert.sameValue(sample.includes(43, null), true, "null [1]");

assert.sameValue(sample.includes(42, obj), false, "object [0]");
assert.sameValue(sample.includes(43, obj), true, "object [1]");