Gwen and Selenoid reduced test execution from 50 minutes to 5

Thats 1000% (10 times) quicker than executing features in sequence!!

Gwen has always had the capability to make use of selenium grid which is particularly useful when running in parallel, and after discovering selenoid by the guys over at Aerokube I had to give it a shot.

Installing selenoid was a breeze with the configuration manager docker setup.  Once installed, selenoid downloads the last two driver versions of chrome, firefox and opera, and starts a grid ready to run tests.

Gwen comes with 235 features out of the box, ready for anyone to try.  These features cover a number of different scenarios including a challenge, navigating etsy, completing a todo, navigating blogs, and searching in google.    The features are also written using both imperative and declarative styles declarative-vs-imperative-gherkin.

Typically running 235 features takes 49 minutes and 33 seconds when running the features sequentially, however running these in parallel with selenoid took only 4 minutes and 41 seconds.  Both samples were run using a 34 core machine.


Gwen running 235 features sequentially
Gwen running 235 features in parallel

I have also included a screenshot of the running docker images, taken at a point in time where parallel was running full swing.

Thats all for now, hope you enjoyed a brief look into Selenoid and Gwen.


Configurable User Properties in gwen-web

One of the really cool features of gwen-web is the ability to load in different parameters at run time.  This allows you to run gwen-web against multiple environments without changing either the feature or the meta files.

Lets take one of the examples with gwen-web and   Below are two examples of how one could set the value.  The first example sets “the how old are you dropdown” to 21, the second example uses a property, in this case different files for two different environments to set the value.

Lets define how the dropdown can be found in the meta first.


And the heading should be “Step 2”
And the how old are you dropdown can be located by id “challenger_age”


When I select “21” in the how old are you dropdown

Now with the properties approach. Lets create two files, and The contents of the two files are below:

In addition we need to make a small modification to both the feature and the meta files


And the heading should be “Step 2”
And my age is defined by property “user.age”
And the how old are you dropdown can be located by id “challenger_age”

Now replace the strikethrough line with the new line in the feature


When I select “21” in the how old are you dropdown
When I select my age in the how old are you dropdown

Editting is complete. To run gwen-web with the environment specific age, simply type “gwen-web features/floodio/ -p -b -r devReport”, or alternatively you can run “gwen-web features/floodio/ -p -b -r sitReport”.

Remote WebDriver feature now available in gwen-web

For my first post, I will be talking about a new feature that has been added to gwen-web.  For those of you not familiar with gwen-web, its a web automation engine that runs inside our gwen interpreter and is used to automate the browser.  gwen-web is unique in that it allows automation of the web browser, using english(dsl) rather than coding or using visual record/playback. We believe this will remove some of the entry level requirements often associated with a coded tool.  For more information please head on over to our gwen github page

Remote WebDriver

Just recently we added the remote webdriver capability.  This means gwen-web can now connect to selenium grid and drive not just the local browser, but also a browser that is installed on a different os, or a browser that has a different version.

Setting up Remote WebDriver with gwen-web

So how do I setup gwen-web with selenium remote webdriver?  What I am going to walk you through is setting up a selenium grid, and attaching nodes to it.  Firstly download the selenium-server-standalone-2.45.0.jar (or most recent) from   Once this has been downloaded, you can start up selenium grid by running the following:

java -jar selenium-server-standalone-2.45.0.jar -role hub

Now lets make sure that its running by navigating to http://localhost:4444/grid/console.  You will notice that there are currently no browsers available.


Running selenium grid in this mode, means we need to register nodes against the grid.

Adding browsers to the current running grid

Lets start by downloading the latest version of chromedriver (specific for the OS) – from  (at the time of writing the blog chromedriver 2.15 is the latest)

Unzip chromedriver and note the path.

Now lets start up selenium-server-standalone as a node role, and register both the chrome driver and firefox driver.  Remembering firefox driver comes with the selenium-server-standalone.

java -jar selenium-server-standalone-2.45.0.jar 
-role node 
-hub http://localhost:4444/grid/register 
-browser browserName=firefox,version=37.0,maxInstances=5,platform=LINUX 
-browser browserName=chrome,version=42.0,maxInstances=5,platform=LINUX

Let me explain the parts above:

  1. java -jar selenium-server-standalone-2.45.0.jar  (standard selenium startup)
  2. (path to chromedriver including the executable)
  3. -role node (run the selenium-server-standalone as a node)
  4. -hub http://localhost:4444/grid/register  (this is the location of the grid that you started back under the previous heading “Setting up  Remote WebDriver with gwen-web”
  5. -browser browserName=firefox,version=37.0,maxInstance=5,platform=LINUX  (the browser, version label and the number of maximum instances to run on this node)  Note:  firefox requires the binary to be in the PATH, alternatively it would need to be specified using -Dwebdriver.firefox.bin
  6. -browser browserName=chrome,version=42.0,maxInstances=5,platform=LINUX.  (register that this node is capable of running chrome)

Testing the grid console

So how do we now confirm the currently registered browsers on the grid.   Navigate to http://localhost:4444/grid/console and now the console should show both firefox and chrome registered and waiting for a connection.


When I setup a grid, I typically like to confirm whether or not the browsers do indeed start up.  To do this I navigate to the node webdriver/hub   E.g.   (you can see the IP address of each node that is registered against this grid).


Then I create two sessions.  One for chrome and one for firefox.  If its working, both chrome and firefox will start.  Just delete the sessions once that has been confirmed.  If its not working, then you will need to go back and troubleshoot.  Typically its driver / binary path related.  If either browser pops up and then closes unexpectedly, make sure to keep both the selenium-server-standalone and the browser versions in sync.  The latest version of selenium-standalone may not work with a version of the browser that is 6 versions out of date.

Setting up gwen-web to work with selenium-grid

Once you have a working grid, gwen web only requires a small change to the file. (eg. edit ~/ and add the following line.)


This tells the gwen-web engine that it needs to communicate with selenium grid which will effectively use the RemoteWebDriver with different browser capabilities.

Running gwen-web with selenium-grid

To run gwen-web with two different browsers it is suggested that you remove gwen.web.browser property from the and pass it in as a “-D” system property.  The below example uses the floodio challenge sample with gwen-web.


bin/gwen-web -Dgwen.web.browser=chrome -b features/floodio -r reports/chrome
bin/gwen-web -Dgwen.web.browser=firefox -b features/floodio -r reports/firefox

Once gwen-web is running, navigate to the selenium node and you will see something like this

Screen Shot 2015-04-30 at 9.42.28 pm

and navigate to the grid localhost:4444/grid/console and you will now see both firefox and chrome running.

Screen Shot 2015-04-30 at 9.42.47 pm