PhpSpreadsheet/tests/PhpSpreadsheet/ReferenceHelperTest.php

<?php

namespace PhpSpreadsheet\Tests;

use PhpSpreadsheet\ReferenceHelper;

class ReferenceHelperTest extends \PHPUnit_Framework_TestCase
{

    public function setUp()
    {
    }

    public function testColumnSort()
    {
        $columnBase = $columnExpectedResult = [
            'A','B','Z',
            'AA','AB','AZ',
            'BA','BB','BZ',
            'ZA','ZB','ZZ',
            'AAA','AAB','AAZ',
            'ABA','ABB','ABZ',
            'AZA','AZB','AZZ',
            'BAA','BAB','BAZ',
            'BBA','BBB','BBZ',
            'BZA','BZB','BZZ'
        ];
        shuffle($columnBase);
        usort($columnBase, array(ReferenceHelper::class,'columnSort'));
        foreach ($columnBase as $key => $value) {
            $this->assertEquals($columnExpectedResult[$key], $value);
        }
    }

    public function testColumnReverseSort()
    {
        $columnBase = $columnExpectedResult = [
            'A','B','Z',
            'AA','AB','AZ',
            'BA','BB','BZ',
            'ZA','ZB','ZZ',
            'AAA','AAB','AAZ',
            'ABA','ABB','ABZ',
            'AZA','AZB','AZZ',
            'BAA','BAB','BAZ',
            'BBA','BBB','BBZ',
            'BZA','BZB','BZZ'
        ];
        shuffle($columnBase);
        $columnExpectedResult = array_reverse($columnExpectedResult);
        usort($columnBase, array(ReferenceHelper::class,'columnReverseSort'));
        foreach ($columnBase as $key => $value) {
            $this->assertEquals($columnExpectedResult[$key], $value);
        }
    }
}