【PHPUnitに詳しい人教えて!】 コンストラクタのテスト方法 ref: http://qiita.com/items/3008

PDOTest.php

<?php
class PDOTest extends \PHPUnit_Framework_TestCase
{
    public function test__construct()
    {
        $pdo = $this
            ->getMockBuilder('\Suin\PDO')
            ->setMethods(array('_getDefaultAttributes'))
            ->disableOriginalConstructor()
            ->getMock();
        $pdo
            ->expects($this->once())
            ->method('_getDefaultAttributes')
            ->will($this->returnValue(array()));

        $pdo->__construct('mysql:host=127.0.0.1;dbname=testdb;charset=utf8;', 'root', 'root');
    }
}

コマンドライン

$ phpunit PDOTest.php 
PHPUnit 3.6.10 by Sebastian Bergmann.

E

Time: 0 seconds, Memory: 3.00Mb

There was 1 error:

1) Suin\PDOTest::test__construct
PDOException: You cannot serialize or unserialize PDO instances

/Users/suin/Desktop/PDOTest.php:44
/Users/suin/.phpenv/versions/5.4.0pear/bin/phpunit:46

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