php - I keep getting this error when I try input phpunit -

i keep getting error in command line on phpstorm when try use phpunit. can explain me? i'm new phpunit.

c:\xampp\php\phpunit.bat

warning: missing argument 3 phpunit_textui_testrunner::dorun(), called in c:\xampp\php\pear\phpunit\textui\command.php on line 176 , defined in c:\xampp\htdocs\tutorials\php_unit_testing\vendor\phpunit\phpunit\src\textui\testrunner.php on line 148

phpunit 5.3-dev sebastian bergmann , contributors.

fatal error: class 'controllers\core\web\pages' not found in c:\xampp\htdocs\tutorials\php_unit_testing\tests\app\controllers\core\web\pagestest.php on line 6

process finished exit code 255 @ 22:23:20. execution time: 186 ms.

here code xml file:

<?xml version='1.0' encoding='utf-8' ?>  <phpunit bootstrap="./vendor/autoload.php"      color="true"      converterrorstoexceptions="true"      convertnoticestoexceptions="true"      convertwarningstoexceptions="true"      stoponfailures="false"      syntaxcheck="false"     > <testsuites>         <testsuite name="tutorial unit tests">             <directory>./tests/</directory>         </testsuite> </testsuites> </phpunit> 

and code pages.php:

<?php    namespace controllers\core\web;   class pages{  public function rendor(){     return 'hello world';  }   public function return_true(){     return true;  }  public function return_array(){     return array('hello', 'world', 'this', 'is', 'an', 'array');  }  }  ?> 

and code pagestest.php:

<?php class pagestest extends phpunit_framework_testcase {  public function testrenderreturnshelloworld(){       $pages = new \controllers\core\web\pages();      $expected = 'hello word';       $this->assertequals($expected, $pages->rendor());  } } ?> 

it doesn't you're loading in library. typically have create alternate autoload.php file , include in phpunit bootsrap value. this:

<phpunit bootstrap="./autoload.php" ...

  #./auotload.php   $loader = require_once __dir__ . '/vendor/autoload.php';   $loader.add('directory_of_code', 'path/to/that/directory');    return $loader;