请教一下，本地做单元测试报500错误怎么解决？

[vsiryxm]

我在本地配置的PHP环境，做了一个hosts解析www.pz.com指向127.0.0.1，
通过浏览器可以访问：http://www.pz.com/v1/demo/index，然后单元测试下来，老是报500错误：
D:\web\puzzlebid>php think unit
PHPUnit 5.7.27 by Sebastian Bergmann and contributors.

F 1 / 1 (100%)

Time: 1.1 seconds, Memory: 4.25MB

There was 1 failure:

1. tests\DemoTest::testIndex
   A request to [http://www.pz.com/v1/demo/index] failed. Received status code [500
   ].

D:\web\puzzlebid\vendor\topthink\think-testing\src\InteractsWithPages.php:484
D:\web\puzzlebid\vendor\topthink\think-testing\src\InteractsWithPages.php:457
D:\web\puzzlebid\vendor\topthink\think-testing\src\InteractsWithPages.php:46
D:\web\puzzlebid\tests\v1\controller\DemoTest.php:18
D:\web\puzzlebid\vendor\phpunit\phpunit\src\Framework\TestCase.php:1062
D:\web\puzzlebid\vendor\phpunit\phpunit\src\Framework\TestCase.php:913
D:\web\puzzlebid\vendor\phpunit\phpunit\src\Framework\TestResult.php:686
D:\web\puzzlebid\vendor\phpunit\phpunit\src\Framework\TestCase.php:868
D:\web\puzzlebid\vendor\phpunit\phpunit\src\Framework\TestSuite.php:733
D:\web\puzzlebid\vendor\phpunit\phpunit\src\Framework\TestSuite.php:733
D:\web\puzzlebid\vendor\phpunit\phpunit\src\TextUI\TestRunner.php:517
D:\web\puzzlebid\vendor\phpunit\phpunit\src\TextUI\Command.php:186
D:\web\puzzlebid\vendor\topthink\think-testing\src\command\Test.php:42
D:\web\puzzlebid\thinkphp\library\think\console\Command.php:175
D:\web\puzzlebid\thinkphp\library\think\Console.php:631
D:\web\puzzlebid\thinkphp\library\think\Console.php:231
D:\web\puzzlebid\thinkphp\library\think\Console.php:168
D:\web\puzzlebid\thinkphp\library\think\Console.php:125

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

---

TestCase.php代码如下：
namespace tests;

class TestCase extends \think\testing\TestCase
{
protected $baseUrl = 'http://www.pz.com';
}

DemoTest.php代码如下：
namespace tests;

class DemoTest extends TestCase
{

public function testIndex()
{
    $this->visit('/v1/demo/index')->see('Hello,Demo!');
}

}

[vsiryxm]

PHP版本 5.6.15 (cli) (built: Oct 29 2015 12:40:34)

[liu21st]

你的think-testing扩展版本是多少

[vsiryxm]

怎么看扩展版本呀？

composer.json文件内容：

{
"name": "topthink/think-testing",
"license": "Apache-2.0",
"type": "think-testing",
"authors": [
{
"name": "yunwuxin",
"email": "448901948@qq.com"
}
],
"require": {
"topthink/think-installer": "~2.0",
"topthink/framework": "5.1.*",
"topthink/think-helper": "~1.0",
"phpunit/phpunit": "^5.0|^6.0",
"symfony/dom-crawler": "^2.8.8"
},
"autoload": {
"psr-4": {
"think\testing\": "src"
},
"files": [
"src/config.php"
]
}
}