在命名构造函数中创建文件

我有一个通过命名构造函数创建文件的类，但当我使用phpspec测试它时，它不会创建文件。

我找不到原因，所以我想重新审视一下我的代码可能会有所帮助。

这是我的文件类：

<?php
namespace Acme;
class File
{
    /**
     * @var Path
     */
    private $path;
    /**
     * @var FileName
     */
    private $fileName;
    private function __construct(Path $path, FileName $fileName)
    {
        $this->path = $path;
        $this->fileName = $fileName;
    }
    public static function create(Path $path, FileName $fileName)
    {
        if (file_exists((string) $path . (string) $fileName)) {
            throw new 'DomainException('File already exists');
        }
        if (!touch((string) $path . (string) $fileName)) {
            throw new 'DomainException('Cannot create file');
        }
        return new self($path, $fileName);
    }
}

这是我的规格：

<?php
namespace spec'Acme;
use PhpSpec'ObjectBehavior;
use Prophecy'Argument;
use Acme'Path;
use Acme'FileName;
class FileSpec extends ObjectBehavior
{
    private $testPath;
    private $existingFileName = 'existingFile.extension';
    private $nonExistingFileName = 'nonExistingFile.extension';
    private $existingFilePath;
    private $nonExistingFilePath;
    function let()
    {
        $this->testPath = sys_get_temp_dir() . '/';
        $this->existingFilePath = $this->testPath . $this->existingFileName;
        $this->nonExistingFilePath = $this->testPath . $this->nonExistingFileName;
        // Creating existing file
        if (!touch($this->existingFilePath)) {
            throw new 'Exception('Cannot create existing file for testing');
        }
        // Removes non existing file
        if (file_exists($this->nonExistingFilePath)) {
            if (!unlink($this->nonExistingFilePath)) {
                throw new 'Exception('Cannot remove non existing file for testing');
            }
        }
    }
    function it_does_not_create_a_file_when_the_file_already_exists(Path $path, FileName $fileName)
    {
        $path->__toString()->willReturn($this->testPath);
        $fileName->__toString()->willReturn($this->existingFileName);
        $this->beConstructedThrough('create', [$path, $fileName]);
        $this->shouldThrow(new 'DomainException('File already exists'))->duringInstantiation();
    }
    function it_creates_a_new_file_if_file_does_not_exist(Path $path, FileName $fileName)
    {
        $path->__toString()->willReturn($this->testPath);
        $fileName->__toString()->willReturn($this->nonExistingFileName);
        $this->beConstructedThrough('create', [$path, $fileName]);
        assert(file_exists($this->nonExistingFilePath));
    }
}