Gaufrette\File::exists PHP Method

    public function exists()
    {
        return $this->filesystem->has($this->key);
    }

 public function testCreateAnDeleteFile()
 {
     $fs = $this->getFilesystem();
     $filename = uniqid('test_');
     $file = new File($filename, $fs);
     $this->assertFalse($file->exists());
     $file->setContent('Hello');
     $this->assertTrue($file->exists());
     $file->delete();
     $this->assertFalse($file->exists());
 }