plexus使用（二）-测试组件
我们使用plexus测试用例代替junit测试用例，前者建立plexus容器接口以便部署时允许我们的组件执行。
需要注意的是，如果我们重载setUp()和tearDown()方法去添加一些通用功能或清理功能，那么我们需要确保调用super.xxx()方法，否则，我们就需要注意plexus容器实例的初始化和清除操作了。
以下是一个基本的组件测试用例：
package org.codehaus.plexus.tutorial;
import java.net.UnknownHostException;
import org.codehaus.plexus.PlexusTestCase;
/**
* Basic test.
*/
public class WebsiteMonitorTest extends PlexusTestCase {
/**
* sets up a Plexus container instance for running test.
*/
protected void setUp() throws Exception {
// call this to enable super class to setup a Plexus container test
// instance and enable component lookup.
super.setUp ();
}
/**
* Test if we are able to lookup and obtain our component instance from the
* container.
*
* @throws Exception
*/
public void testBasic() throws Exception {
WebsiteMonitor component = (WebsiteMonitor) lookup (WebsiteMonitor.ROLE);
assertNotNull (component);
}
/**
* Test an unkown host.
*
* @throws Exception
*/
public void testUnknownHost() throws Exception {
WebsiteMonitor component = (WebsiteMonitor) lookup (WebsiteMonitor.ROLE);
assertNotNull (component);
Exception e = null;
try {
component.monitor ("http://www.yadayadayda.com/");
} catch (Exception e1) {
e = e1;
}
assertNotNull (e);
assertEquals (true, (e instanceof UnknownHostException));
}
/**
* Test a page that does not exists.
*
* @throws Exception
*/
public void testNotOKCode() throws Exception {
WebsiteMonitor component = (WebsiteMonitor) lookup (WebsiteMonitor.ROLE);
assertNotNull (component);
Exception e = null;
try {
component.monitor ("http://www.google.co.nz/unknown_404_.html");
} catch (Exception e1) {
e = e1;
}
assertNotNull (e);
}
}
在eclipse中yunxing单元测试，如所料，出现异常了。以下是monitor的具体实现代码(我们更新DefaultWebsiteMonitor类继承org.codehaus.plexus.logging.AbstractLogEnabled代替了第一版的system.out来实例化容器的org.codehaus.plexus.logging.Logger)
public class DefaultWebsiteMonitor extends AbstractLogEnabled implements WebsiteMonitor {/*
* (non-Javadoc)
*
* @see org.codehaus.plexus.tutorial.WebsiteMonitor#monitor(java.lang.String)
*/
public void monitor(String website) throws Exception {
HttpClient client = new HttpClient ();
HttpMethod getMethod = new GetMethod (website);
getMethod.setFollowRedirects (false);
try {
int statusCode = client.executeMethod (getMethod);
if (statusCode < HttpStatus.SC_OK || statusCode >= HttpStatus.SC_MULTIPLE_CHOICES) {
if (getLogger ().isErrorEnabled ())
getLogger ().error ("HTTP request returned HTTP status code: " + statusCode);
throw new Exception ("HTTP request returned HTTP status code: " + statusCode);
}
if (getLogger ().isInfoEnabled ())
getLogger ().info ("HTTP request returned HTTP status code: " + statusCode);
} catch (UnknownHostException e) {
if (getLogger ().isErrorEnabled ())
getLogger ().error ("Specified host '" + website + "' could not be resolved.");
throw e;
}
}
}