PHPUnit ReflectionException Method suite does not exist

I'm using PHPUnit version 3.6.2, and always got

PHP ReflectionException: Method suite does not exist in /pathTo/pear/PHPUnit/Runner/BaseTestRunner.php on line 113

when running single test:

phpunit path/to/my/ClassToTest.php

PHPUnit installed using pear, and I'm using php 5.3.6

are any php configurations I should fix? или это просто что-то, что PHPUnit должен исправить.

the class

<?php

class ClassToTest extends PHPUnit_Framework_TestCase{

    public function testSomething(){
        $this->assertTrue(true);
    }

}