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Thursday, September 25, 2014

Silencing ChromeDriver with WebDriver

While setting up a test environment today we decided to have the tests running on the same machine as the build radiator.

A build radiator takes up the entire display. It shows a green bar for each job on the build server. If someone checks in a change and it breaks a test, the bar turns red and everyone stops to fix the build.

The consequence of this is that the build radiator has to be visible to everyone in the room. Having a browser open on the display is not an option.

So we need to run our WebDriver tests without showing the browser or any other output. Our build server is running Linux. So we have WebDriver tests. We can run them from the command line using something like:
java org.testng.TestNG testng.xml
where testng.xml is a TestNG test suite example. When we run it as this we see the browser open and the tests executing. The tests were written using ChromeDriver. When we run this on the build radiator however, we don't want the browser opening. The solution is actually quite easy for Linux. We use an application called Xvfb:
xvfb-run --server-args="-screen 0 1600x1200x24" java org.testng.TestNG testng.xml
The command xvfb-run will run the application using the X Virtual FrameBuffer. The --server-args lets us pass arguments to the server. The "-screen 0" tells xvfb to use screen 0. The "1600x1200x24" tells xvfb to make the virtual display 1600 by 1200 with 24 bit depth. If your application has to work on 1024 by 768 and 16 bit colour then you can use "1024x768x16".

When you execute this you will not see the browser open. It almost seems like nothing is happening. The only thing you will see is the output from TestNG (a dot for a pass, an I for an ignore and an F for a failure) and the output from chromedriver. What if you want to look at the logs and see just the output from TestNG; not interlaced with output from chromedriver?

This requires a few changes to the creation of the WebDriver object. Normally, you might have something like:
System.setProperty("", "./chromedriver");
WebDriver driver = new WebDriver();
but this outputs chromedriver log information to the screen. You could use:
System.setProperty("", "./chromedriver");
System.setProperty("", "--disable-logging");
WebDriver driver = new WebDriver();
This will stop most the output but you will see the header for when chromedriver starts up:
Starting ChromeDriver (v2.9.248307) on port 9515
So how do you get rid of this? I was digging through the code for chromedriver (remember it is open source) and I found some code where it was checking for the property If this was set to true then it would run with the silent flag set to true. So I tried:
System.setProperty("", "./chromedriver");
System.setProperty("", "--disable-logging");
System.setProperty("", "true");
WebDriver driver = new WebDriver();
Sure enough that did it. Complete silence from chromedriver.