PHP-错误：驱动程序可执行文件的路径必须由webdriver.gecko.driver系统属性设置

我正在使用PHP进行自动化功能单元测试.我想使用PHPStorm在登台环境上运行测试,并且我关注以下链接：https://www.sitepoint.com/using-selenium-with-phpunit/.我有完整的任务,直到以下代码：
我已经访问了此链接,但不适用于我. The path to the driver executable must be set by the webdriver.gecko.driver system property

<?PHP

/**
 * Created by PHPStorm.
 * User: Developer4
 * Date: 11/2/2016
 * Time: 1:41 PM
 */
class uatTest extends PHPUnit_Extensions_Selenium2TestCase
{
    public function setUp()
    {
        $this->setHost('localhost');
        $this->setPort(4444);
        $this->setbrowserUrl('https://www.facebook.com/');

        $this->setbrowser('firefox');
    }
    public function tearDown()
    {
        $this->stop();
    }
    public function validInputsProvider()
    {
        $inputs[] = [
            [
                'email'              => 'user',
                'pass'              => 'pass'
            ]
        ];
        return $inputs;
    }
    public function testFormSubmissionWithUsername()
    {
        $this->byName('email')->value('user');
        $this->byId('loginbutton')->submit();
        $email = $this->byName('email');
        $this->assertEquals('user', $email->value());
    }
}

当我的硒服务器正在运行时：

当我在PHPstorm上运行测试时,出现此错误

错误：

C:\wamp\bin\PHP\PHP5.6.25\PHP.exe C:/wamp/www/PHPUnit-and-Composer-Workflow/vendor/PHPunit/PHPunit/PHPunit --no-configuration uatTest C:\wamp\www\PHPUnit-and-Composer-Workflow\test\uatTest.PHP --teamcity
Testing started at 2:53 PM ...
PHPUnit 5.6.2 by Sebastian Bergmann and contributors.


The path to the driver executable must be set by the webdriver.gecko.driver system property; for more @R_617_4045@ion, see https://github.com/mozilla/geckodriver. The latest version can be downloaded from https://github.com/mozilla/geckodriver/releases
 C:\wamp\www\PHPUnit-and-Composer-Workflow\vendor\PHPunit\PHPunit-selenium\PHPUnit\Extensions\Selenium2TestCase\Driver.PHP:165
 C:\wamp\www\PHPUnit-and-Composer-Workflow\vendor\PHPunit\PHPunit-selenium\PHPUnit\Extensions\Selenium2TestCase\Driver.PHP:72
 C:\wamp\www\PHPUnit-and-Composer-Workflow\vendor\PHPunit\PHPunit-selenium\PHPUnit\Extensions\Selenium2TestCase\SessionStrategy\Isolated.PHP:67
 C:\wamp\www\PHPUnit-and-Composer-Workflow\vendor\PHPunit\PHPunit-selenium\PHPUnit\Extensions\Selenium2TestCase.PHP:296
 C:\wamp\www\PHPUnit-and-Composer-Workflow\vendor\PHPunit\PHPunit-selenium\PHPUnit\Extensions\Selenium2TestCase.PHP:337
 C:\wamp\www\PHPUnit-and-Composer-Workflow\vendor\PHPunit\PHPunit-selenium\PHPUnit\Extensions\Selenium2TestCase.PHP:314



Time: 823 ms, Memory: 3.50MB


ERRORS!
Tests: 1, Assertions: 0, Errors: 1.

Process finished with exit code 2

并在cmd上得到理解：

解决方法:

这是解决方案：

    java -Dwebdriver.gecko.driver="C:\Users\Developer4\Downloads\geckodriver-v0.11.1-win32\geckodriver.exe" -jar C:\wamp\bin\PHP

\PHP5.6.25\selenium-server-standalone-3.0.1.jar