test/built-ins/String/prototype/trim/15.5.4.20-2-42.js


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

/*---
es5id: 15.5.4.20-2-42
description: >
    String.prototype.trim - TypeError exception was thrown  when
    'this' is an object that both toString and valueOf wouldn't return
    primitive value.
---*/

        var toStringAccessed = false;
        var valueOfAccessed = false;
        var obj = {
            toString: function () {
                toStringAccessed = true;
                return {};
            },
            valueOf: function () {
                valueOfAccessed = true;
                return {};
            }
        };
assert.throws(TypeError, function() {
            String.prototype.trim.call(obj);
});
assert(valueOfAccessed, 'valueOfAccessed !== true');
assert(toStringAccessed, 'toStringAccessed !== true');