PHPUnit Mock API with Zend\Db

MockDbAdapter.php

<?php
$date = new DateTime();

$mockStatement = $this->getMock('Zend\Db\Adapter\Driver\Pdo\Statement');
$mockStatement->expects($this->once())->method('execute')->with($this->equalTo(array(
    'timestamp' => $date->format(FormatterInterface::DEFAULT_DATETIME_FORMAT)
)));

$mockDbDriver = $this->getMockBuilder('Zend\Db\Adapter\Driver\Pdo\Pdo')
    ->disableOriginalConstructor()
    ->getMock();

$mockDbAdapter = $this->getMock('Zend\Db\Adapter\Adapter', array(), array($mockDbDriver));
$mockDbAdapter->expects($this->once())
    ->method('query')
    ->will($this->returnValue($mockStatement));