setContents example

 elseif (\is_array($param)) {
            $defaults = [
                'name' => 'file.txt',
                'contents' => null,
                'mode' => null,
                'type' => null,
                'relativePath' => null,
                'relativePathname' => null,
            ];
            $defaults = array_merge($defaults, $param);
            parent::__construct($defaults['name']);
            $this->setContents($defaults['contents']);
            $this->setMode($defaults['mode']);
            $this->setType($defaults['type']);
            $this->setRelativePath($defaults['relativePath']);
            $this->setRelativePathname($defaults['relativePathname']);
        } else {
            throw new \RuntimeException(sprintf('Incorrect parameter "%s"', $param));
        }
    }

    public function isFile(): bool
    {