Unit Testing Zend_Http_Client Based Web Service Calls

WebService.php

<?php

namespace App\Service;

/**
 * Some web service client
 *
 * @author Lee Boynton
 */
class WebService
{
	/**
	 * @var \Zend_Http_Client
	 */
	private $client = false;
	
	/**
	 * @var string 
	 */
	private $uri;
	
	/**
	 * @param string $uri Web service API endpoint (single endpoint, this is an
	 * RPC style web service)
	 */
	public function __construct($uri)
	{
		$this->uri = $uri;
	}
	
	/**
	 * @return \Zend_Http_Client
	 */
	public function getHttpClient()
	{
		if (!$this->client)
		{
			$this->client = $this->getDefaultHttpClient();
		}
		
		$this->client->setUri($this->uri);
		return $this->client;
	}

	/**
	 * @param \Zend_Http_Client $client
	 */
	public function setHttpClient(\Zend_Http_Client $client)
	{
		$this->client = $client;
	}
	
	private function getDefaultHttpClient()
	{
		return new \Zend_Http_Client();
	}
	
	/**
	 * Call web service
	 * @return string Just return the body of the request
	 * @throws \RuntimeException If request fails
	 */
	public function callWebService()
	{
		$client = $this->getHttpClient();
		$client->setParameterGet('test', 'test');
		
		try
		{
			$response = $client->request();
		}
		catch(\Zend_Http_Client_Adapter_Exception $exception)
		{
			throw new \RuntimeException('Request failed', null, $exception);
		}
		
		return $response->getBody();
	}
}

WebServiceTest.php

<?php

namespace AppTest\Service;

use App\Service\WebService;

/**
 * Test class for App_Service_WebService
 *
 * @author Lee Boynton
 */
class WebServiceTest extends \PHPUnit_Framework_TestCase
{
	/**
	 * @var App\Service\WebService 
	 */
	protected $webService;
	
	/**
	 * @var \Zend_Http_Client_Adapter_Interface
	 */
	protected $adapter;
	
	public function setUp()
	{
		$this->webService = new WebService('http://fake');
		$this->adapter = new \Zend_Http_Client_Adapter_Test();
		$this->webService->getHttpClient()->setAdapter($this->adapter);
	}
	
	public function testCallWebServiceWhenSuccessful()
	{
		// web service call will return "ok"
		$this->adapter->setResponse(
			"HTTP/1.1 200 OK"         . "\r\n" .
			"Content-Type: text/html" . "\r\n" .
						    "\r\n" .
			'ok');
		
		$this->assertEquals('ok', $this->webService->callWebService());
	}
	
	public function testCallWebServiceWhenUnsuccessful()
	{
		$this->setExpectedException('RuntimeException');
		$this->adapter->setNextRequestWillFail(true);
		$this->webService->callWebService();
	}
}