Implementing TestNG listener to capture screenshot in TestNG parallel running mode

[sel.scone]

I am currently driving my Selenium-Webdriver tests using TestNG and I am planning to run them in parallel in the future using TestNG's parallel option.

Currently, my driver (firefox, ie, etc.) is created in @BeforeMethod. I would like to take a screenshot of my test if it fails. I know one way to do it is to have ITestResult as a parameter of your @AfterMethod, then in your @AfterMethod, check if the result is failure and take a screenshot using your driver if it is. However, I do not want to keep repeating that conditional check (whether test result is failure) in every one of my @AfterMethod (Imagine I have 20 test classes and each one of them has @AfterMethod). An idea I have is to implement ITestListener and take a screenshot in method onTestFailure().

However, I am not familiar with multi-threading at all, and currently my driver is not globally accessible/is instance-based (i.e. I don't have for example, a static method like DriverManager.getDriver() to access/get my driver). My question is, if I change my code and make my driver global, and use it to take a screenshot in the onTestFailure() method of my listener class, is the driver/my test/screenshot going to be all confused when I run my tests in parallel using TestNG?

Thanks a lot in advance! 

[Krishnan Mahadevan]

http://darrellgrainger.blogspot.in/2012/07/generating-screen-capture-when-using.html

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Thanks & Regards
Krishnan Mahadevan

"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/

[S N]

Thank you Kristnan! I already have that in my code - I can take screnshot with my driver.

However, I want my code to take a screenshot automatically when a test fails.

I am not sure if implementing TestNG's ITestListener is a solution at all if I am going to run tests in parallel using TestNG..
And basically, is it even possible to use a global driver and run tests in parallel, and the driver in different in each test? It doesn't sound possible at all to me.. Sorry if I ask this question because my brain is not functioning..

[S N]

and the driver *is* different in each test

[Krishnan Mahadevan]

When you are doing parallel runs you should work with a ThreadLocal. That would ensure that every thread gets its own copy of the WebDriver. 

Capturing screenshots on failure IMO should be done using EventFiringWebDriver because the code is a lot more cleaner and you are NOT polluting your listener with all the Webdriver references etc. 

Hope that helps. 

[S N]

I wish I could remove this useless thread...sorry I dont think my brain is working right now -__-.....I dont think implementing ITestListener will work in my case.

[S N]

Hey thanks! Let me look into EventFiringWebDriver. Really appreciate your help!

[Michael Wowro]

@Krishnan,

thx, especially for the hint with LocalThread

Yours Michael

[Michael Wowro]

... ThreadLocal ...

[Mark Collin]

I updated my Selenium Maven template today to use TestNG and take screenshots on failure using a listener.

 

The code for multi threaded runs at method level is in there but not finished yet (need to read in the number of threads from a maven property, coming soon)

 

https://github.com/Ardesco/Selenium-Maven-Template

[S N]

Wow Mark, thanks! I will stay tuned :)