/**
 * Tests pre-ES6 fallback symbol subset
 *
 *  Copyright (C) 2014 Free Software Foundation, Inc.
 *
 *  This file is part of GNU ease.js.
 *
 *  ease.js is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


require( 'common' ).testCase(
{
    caseSetUp: function()
    {
        this.Sut = this.require( 'util/symbol/FallbackSymbol' );
    },


    /**
     * Symbols are used to create an object fields that is accessible only
     * to the holder of a reference to the symbol used to create that field.
     * Since this fallback is intended to be used in environments that do
     * not support symbols, the alternative is to return a random string
     * that is highly unlikely to exist in practice.
     */
    'Constructor returns a generated string': function()
    {
        var result = this.Sut();

        this.assertOk( typeof result === 'string' );
        this.assertOk( result.length > 0 );
    },


    /**
     * The generated string should be unique for each call, making it
     * unlikely that its value can be guessed. Of course, this relies on the
     * assumption that the runtime's PRNG is reliable and that it has not
     * been maliciously rewritten.
     *
     * Note that we don't test the various implementation details, as that
     * is intended to be opaque (see SUT source for details).
     */
    'Generated string varies with each call': function()
    {
        var gen = {},
            i   = 32;

        while ( i-- )
        {
            var result = this.Sut();
            if ( gen[ result ] )
            {
                this.fail( result, '' );
            }

            gen[ result ] = true;
        }

        // this prevents the test from being marked as incomplete
        this.assertOk( 'passed' );
    },
} );