PhpUnit测试|将代码移至设置

Question

我可以解释一下这个代码是如何重构的吗？期待将文件设置和请求触发器移动到设置部分，因为它不会一直改变。我一直在使用phpunit测试。

感谢任何帮助！

<?php

class OrdersControllerTest extends TestCase
{

    public function setUp()
    {
        $this->resetInstance();
    }

    public function testEmptyOrderUpload() {
        $filename = 'empty.pdf';
        $filepath = APPPATH.'tests/fixtures/'.$filename;
        $files = [
            'order_file' => [
                'name'     => $filename,
                'type'     => 'pdf',
                'tmp_name' => $filepath,
            ],
        ];
        $this->request->setFiles($files);
        $output = $this->request('POST', 'orders/upload');

        $this->assertContains(500, $result->errors);
    }

    public function testValidOrderUpload() {
        $filename = 'order.pdf';
        $filepath = APPPATH.'tests/fixtures/'.$filename;
        $files = [
            'order_file' => [
                'name'     => $filename,
                'type'     => 'pdf',
                'tmp_name' => $filepath,
            ],
        ];
        $this->request->setFiles($files);
        $output = $this->request('POST', 'orders/upload');

        $this->assertContains(444, $result->errors);
    }
}