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<?php
/**
* @copyright Copyright (c) 2017 Matthias Held <matthias.held@uni-konstanz.de>
* @author Matthias Held <matthias.held@uni-konstanz.de>
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
namespace OCA\RansomwareDetection\tests\Unit\Entropy;
use OCA\RansomwareDetection\Entropy\Entropy;
use OCP\ILogger;
use Test\TestCase;
class EntropyTest extends TestCase
{
/** @var \OCA\RansomwareDetection\Entropy\Entropy */
protected $entropy;
/** @var ILogger|\PHPUnit_Framework_MockObject_MockObject */
protected $logger;
public function setUp(): void
{
parent::setUp();
$this->logger = $this->createMock(ILogger::class);
$this->entropy = new Entropy($this->logger);
}
public function dataCalculateEntropy()
{
$tests = [];
$tests[] = ['foo', 0.918296];
$tests[] = ['1234567890', 3.321928];
return $tests;
}
/**
* @dataProvider dataCalculateEntropy
*
* @param string $data
* @param float $entropy
*/
public function testCalculateEntropy($data, $entropy)
{
$this->assertEquals(number_format($this->entropy->calculateEntropy($data), 6), $entropy);
}
public function dataSd()
{
$tests = [];
$tests[] = [[10, 2, 38, 23, 38, 23, 21], 12.298996];
$tests[] = [[10, 12, 23, 23, 16, 23, 21, 16], 4.898979];
$tests[] = [[-5, 1, 8, 7, 2], 4.673329];
return $tests;
}
/**
* @dataProvider dataSd
*
* @param string $data
* @param float $entropy
*/
public function testSd($data, $sd)
{
$sum = 0.0;
$mean = 0.0;
$standardDeviation = 0.0;
foreach($data as $key => $value) {
$sum = $sum + pow($value, 2);
$mean = $this->invokePrivate($this->entropy, 'calculateMeanOfSeries', [$mean, $value, $key + 1]);
$standardDeviation = $this->invokePrivate($this->entropy, 'calculateStandardDeviationOfSeries', [$key + 1, $sum, $mean]);
}
$this->assertEquals(number_format($standardDeviation, 6), $sd);
}
}
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