Tag Archives: firefox

Xlib: extension “RANDR” missing on display…

i got in the log of my selenium based integration test against firefox inside a Xvfb server. My first thought was of a missing library but the problem is caused by selenium:

“org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:”

was the line above and i had recently updated firefox on my ubuntu 12.01 server to version 15 by normal updates. The maven dependent selenium plugin version was still the same when i got the error. After updating to the latest version everything works as before:

 

		
			org.seleniumhq.selenium
			selenium-java
			2.24.1
			test
		

Running headless webdriver based selenium junit tests inside jenkins under ubuntu linux

My test setup is for a little wicket 1.5.x based web application with ui tests running during integration-test phase of maven 3.x. The problem here is that my ubuntu 12.01 server has only a console and no gnome or kde running like a desktop linux. Inside eclipse is a test, which starts a browser like firefox to run automated clicks, no problem. I decided to use the webdriver based selenium tests which can use several driver for the different browser. Each driver supports a different browser like chrome, internet explorer or firefox. My tests starts a firefox with explicit locale setting. The wicket application is i18n localized for english an german speaking customer. On the server is a jenkins ci installed with subversion polling to run automated tests during maven build. You can run the scenario with no problems as well under hudson as ci. The solution use xvfb a virtual xwindow system for firefox as desktop. It will automatically started and stopped by jenkins during a job build.

Software Installation on the server

Installation of xvfb

apt-get install xvfb gtk2-engines-pixbuf

Installation of fonts

apt-get install xfonts-base xfonts-75dpi xfonts-100dpi
apt-get install xfonts-scalable xfonts-cyrillic

Installation of tools for testing xvfb

apt-get install x11-apps imagemagick

Testing server installation

1. Console run server

Xvfb -ac :99 -screen 0 1280x1024x16

2. console start firefox

export DISPLAY=:99
firefox http://ralf.schaeftlein.com

3. console make a screenshot

xwd -root -display :99 | convert xwd:- capture.png

And see a result like this when you retrieve the file capture.png via ssh

 

 

 

 

 
 

Jenkins Configuration

Init.d Script for xvfb

Save content as file under /etc/inid.d/xvfb

XVFB=/usr/bin/Xvfb
XVFBARGS="$DISPLAY -ac -screen 0 1280x1024x16"
PIDFILE=/var/hudson/xvfb_${DISPLAY:1}.pid
case "$1" in
  start)
    echo -n "Starting virtual X frame buffer: Xvfb"
    /sbin/start-stop-daemon --start --quiet --pidfile $PIDFILE --make-pidfile --background --exec $XVFB -- $XVFBARGS
    echo "."
    ;;
  stop)
    echo -n "Stopping virtual X frame buffer: Xvfb"
    /sbin/start-stop-daemon --stop --quiet --pidfile $PIDFILE
    echo "."
    ;;
  restart)
    $0 stop
    $0 start
    ;;
  *)
  echo "Usage: /etc/init.d/xvfb {start|stop|restart}"
  exit 1
esac
exit 0

Set rights for jenkins running user on the script

chown jenkins:root /etc/init.d/xvfb
chmod ug+rwx /etc/init.d/xvfb

Add display environment variable to jenkins init.d script

export DISPLAY=:99

Create a new jenkins job

Create a new jenkins job for your web project stored in subversion

 Add to pre and post build step a shell script to start and stop xvfb

 

 

 

 

 

 

 

 

Configure maven pom of the web project

Define special tests in surefire to run as integration tests and jetty as integration application server

			
				org.apache.maven.plugins
				maven-surefire-plugin
				2.4.3
				
					true
				
				
					
						surefire-test
						test
						
							test
						
						
							false
							
								**/itest/**
							
						
					

					
						surefire-itest
						integration-test
						
							test
						
						
							false
							
								**/itest/**
							
						
					
				
			
			
				org.mortbay.jetty
				maven-jetty-plugin
				6.1.26
				
					10
					foo
					9998
					/${project.artifactId}
					true
					${basedir}/src/test/webapp/WEB-INF/web.xml
					
						
							9999
							60000
						
					
				
				
					
						start-jetty
						pre-integration-test
						
							run
						
						
							0
							true
						
					
					
						stop-jetty
						post-integration-test
						
							stop
						
					
				
			

Add dependency to selenium maven artifacts

		
			org.seleniumhq.selenium.client-drivers
			selenium-java-client-driver
			1.0.2
			test
		
		
			org.seleniumhq.selenium
			selenium-java
			2.21.0
			test
		

Record ui steps and write a selenium junit test

Install the selenium ide as firefox plugin

Start firefox and install the xpi file as new plugin. Restart firefox afterwards.

Record ui steps

  1. Open the menu, choose web developer and their selenium ide.
  2. Start inside eclipse the tomcat with your web application
  3. Open in firefox the web application
  4. Click  inside selenium ide on the red record button for start recording
  5. Click through your web application
  6. Click again on the red record button for stop recording
  7. Choose from menu “Export as testcase” and their “Junit4 (Webdriver backed)”
  8. Save file as test.java

Create an new selenium junit test file

  1. Copy the test.java into your eclipse project into the src/test/java folder
  2. Adopt the class definition and setup method like this
public class SeleniumTest {

	private Log log = LogFactory.getLog(getClass());

	protected Selenium selenium;

	@Before
	public void setUp() throws Exception {
		FirefoxProfile profile = new FirefoxProfile();
		// enable german language locale
		profile.setPreference("intl.accept_languages", "de-de,de");
		profile.setEnableNativeEvents(true);
		profile.layoutOnDisk();
		WebDriver driver = new FirefoxDriver(profile);
		String baseUrl = "http://localhost:9999/"; // port jetty surefire integration test
		selenium = new WebDriverBackedSelenium(driver, baseUrl);
	}

– insert java code –

  1. Check into subversion and control jenkins job console.

Centos 6.2 with Firefox 9 and Google Chrome 16

Centos recently published v6.2

 

Out of the box is Firefox 3.x and no Google Chrome installed.

Steps to install Google Chrome 16 (as root)

Steps to install Firefox 9 (as before as root).

To install the Virtual box Guest Additions:

  1. yum update
  2. yum install gcc
  3. yum install kernel-devel
  4. Mount Guest Additions iso image
  5. Run autostart on the cd
  6. Enter root password
  7. After install reboot vm

 

Get rid of annoying SHIFT-R and SHIFT-A hints on images

Either Vodafone and T-Mobile use hidden picture compressions and remove alt text inside web pages when you surf with a UMTS stick. The traffic goes through a transparent proxy with that “feature”. Pictures inside browsers have less quality. Most annoying for me is that if you browse on geocaching.com for Geocaches on a map. You see normally the name of the cache if your mouse goes over the cache icon on the map. With a mobile internet connection you see a hint that “Shift-R improves quality of that picture and SHIFT-A improves the quality of all picture on that page”. A solution for this is a firefox plugin called: “Modify Headers“. Go to the extras menu and open “Modify Headers” entry. Enter a new rule and in the first field (Name) “Cache-Control” and in the second field “no-cache” (Value). Save the rule and enable them. Restart the browser. Now reopen with firefox a page with pictures. Quality as with normal internet connections and no more annoying hints to improve quality. In geocaching.com maps will now the name of the cache presented as expected.