Phpml\SupportVectorMachine\DataTransformer::testSet PHP Method

    public static function testSet(array $samples) : string
    {
        if (!is_array($samples[0])) {
            $samples = [$samples];
        }
        $set = '';
        foreach ($samples as $sample) {
            $set .= sprintf('0 %s %s', self::sampleRow($sample), PHP_EOL);
        }
        return $set;
    }

 public function testTransformSamplesToTestSet()
 {
     $samples = [[1, 1], [2, 1], [3, 2], [4, 5]];
     $testSet = '0 1:1 2:1 ' . PHP_EOL . '0 1:2 2:1 ' . PHP_EOL . '0 1:3 2:2 ' . PHP_EOL . '0 1:4 2:5 ' . PHP_EOL;
     $this->assertEquals($testSet, DataTransformer::testSet($samples));
 }