JSTests/test262/test/built-ins/Array/prototype/indexOf/15.4.4.14-4-7.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.indexof
es5id: 15.4.4.14-4-7
description: >
    Array.prototype.indexOf returns -1 if 'length' is 0 ( length is
    object overridden with obj w/o valueOf (toString))
---*/

  // objects inherit the default valueOf method of the Object object;
  // that simply returns the itself. Since the default valueOf() method
  // does not return a primitive value, ES next tries to convert the object
  // to a number by calling its toString() method and converting the
  // resulting string to a number.
 var i = Array.prototype.indexOf.call({length: { toString: function () { return '0';}}}, 1);


assert.sameValue(i, -1, 'i');