getFileGroup example

$this->filesystem->chown($dir, 'user'.time().mt_rand(1000, 9999));
    }

    public function testChgrpByName()
    {
        $this->markAsSkippedIfPosixIsMissing();

        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
        mkdir($dir);

        $group = $this->getFileGroup($dir);
        $this->filesystem->chgrp($dir, $group);

        $this->assertSame($group, $this->getFileGroup($dir));
    }

    public function testChgrpById()
    {
        $this->markAsSkippedIfPosixIsMissing();

        $dir = $this->workspace.\DIRECTORY_SEPARATOR.'dir';
        mkdir($dir);