Fixtures problem - cakephp 2.0 unit-testing

I cant find answer how to work with fixtures, i'm working in big project and my task is to start writing tests to all system controllers nad models but i cant handle with fixtures they still give me pdo errors ; / for e.x. my fixture to UserRoleHistoryFixture.php looks this way:

<?php

    class UserRoleHistoryFixture extends CakeTestFixture {

        public $name = 'UserRoleHistory';

        public $import = array('model' => 'UserRoleHistory', 'records' => false, 'connection' => 'test');

}

im using its this way: 

class UserTest extends CakeTestCase {

    public $fixtures = array('app.user', 'app.user_role', 'app.session',

        'app.users_activity', 'app.user_role_history'

        );

    public $controllerName = 'Users';

    public $autoRedirect = false;

    public function setUp() {

        parent::setUp();

        $this->loadFixtures('User');
}

my every fixture looks this way, as it was shown on cakebook http://book.cakephp.org/2.0/en/development/testing.html i have no idea what to do now, so im asking for help.

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