<?php

/**
 * Hoa
 *
 *
 * @license
 *
 * New BSD License
 *
 * Copyright © 2007-2017, Hoa community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Hoa nor the names of its contributors may be
 *       used to endorse or promote products derived from this software without
 *       specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * POSSIBILITY OF SUCH DAMAGE.
 */

namespace Hoa\Math\Test\Unit\Combinatorics\Combination;

use Hoa\Math\Combinatorics\Combination\CartesianProduct as CUT;
use Hoa\Test;

/**
 * Class \Hoa\Math\Test\Unit\Combinatorics\Combination\CartesianProduct.
 *
 * Test suite of the cartesian product.
 *
 * @copyright  Copyright © 2007-2017 Hoa community
 * @license    New BSD License
 */
class CartesianProduct extends Test\Unit\Suite
{
    public function case_empty()
    {
        $this
            ->given($iterator = new CUT([]))
            ->when($result = iterator_to_array($iterator))
            ->then
                ->array($result)
                    ->isEqualTo([[null]]);
    }

    public function case_X()
    {
        $this
            ->given($iterator = new CUT([1, 2, 3]))
            ->when($result = iterator_to_array($iterator))
            ->then
                ->array($result)
                    ->isEqualTo([
                        [1],
                        [2],
                        [3]
                    ]);
    }

    public function case_X_Y()
    {
        $this
            ->given($iterator = new CUT([1, 2, 3], [4, 5, 6]))
            ->when($result = iterator_to_array($iterator))
            ->then
                ->array($result)
                    ->isEqualTo([
                        [1, 4],
                        [2, 4],
                        [3, 4],

                        [1, 5],
                        [2, 5],
                        [3, 5],

                        [1, 6],
                        [2, 6],
                        [3, 6]
                    ]);
    }

    public function case_X_Y_Z()
    {
        $this
            ->given($iterator = new CUT([1, 2, 3], [4, 5, 6], [7, 8, 9]))
            ->when($result = iterator_to_array($iterator))
            ->then
                ->array($result)
                    ->isEqualTo([
                        [1, 4, 7],
                        [2, 4, 7],
                        [3, 4, 7],
                        [1, 5, 7],
                        [2, 5, 7],
                        [3, 5, 7],
                        [1, 6, 7],
                        [2, 6, 7],
                        [3, 6, 7],

                        [1, 4, 8],
                        [2, 4, 8],
                        [3, 4, 8],
                        [1, 5, 8],
                        [2, 5, 8],
                        [3, 5, 8],
                        [1, 6, 8],
                        [2, 6, 8],
                        [3, 6, 8],

                        [1, 4, 9],
                        [2, 4, 9],
                        [3, 4, 9],
                        [1, 5, 9],
                        [2, 5, 9],
                        [3, 5, 9],
                        [1, 6, 9],
                        [2, 6, 9],
                        [3, 6, 9]
                    ]);
    }
}