Where does Selenium store the DOM, if at all? - selenium

I'm trying to understand the performance impacts of things like WebDriver.findBy(...). For example if I was using Selenium to drive a local Chrome instance:
WebElement betty = webDriver.findBy(By.id("betty"));
Does the Selenium library
a) have the DOM within the JVM to evaluate?
b) go to the local Chrome driver binary to evaluate?
c) go to the browser instance to evaluate?
And does the answer change for a Grid situation?

I found a nice technical guide that explains this.
The browser driver uses an HTTP SERVER which waits continuously for
new Selenium commands.
It has the following purposes:
read HTTP requests coming from the client (client = computer that executes the test automation scripts)
determines the series of steps needed for implementing the Selenium command
sends the implementation steps to the browser
gets the execution status from the browser
send the execution status back to the client
For each Selenium command of the automation script, a http request with a specific path is created.
When the automation script is executed, the first http request generates a new session that is specific to the browser where the automation scripts run.
The session id will be used for the http requests that correspond to all other
Selenium commands from the automation script.

Related

Jmeter with Selenium runs scenario Sequentially and not paralelly

We have a Junit Framework where in we have written the methods using Java/Selenium ( which occasionally we use for regression testing as well). Same methods we are mapping it to JMX file and then triggering the Jmeter to test our performance tests. all the methods have #Test annotation for Jmeter to detect.
I am launching Jmeter through command prompt with command
jmeter.bat -n -t c:\dev\test.jmx -Jusers = 3
Jmeter launches 3 browsers, but operation on Browser will happen only when i bring the browser to focus, that is username will enter in Browser 1 if its in focus , similarly in Browser 2 if its in focus. If not in focus then its failing that method. How can i overcome this problem.
Thanks in advance.
Well-behaved Selenium tests shouldn't require the browser to be in focus otherwise executing tests via Selenium Grid or in Headless mode won't be possible.
So my expectation is that the problem is not connected with JMeter, it's rather about your Selenium Java code which is relying on the browser to be in focus, please review your code and ensure that you're only using Selenium API (or Java API) for any browser manipulations including:
filling in forms
uploading files
downloading files
etc.
For instance if you're using any Robot class functions - these classes are a subject for refactoring.
The above issue got resolved once we started executing Chrome in headless mode. It is working fine now.

i want to run my jmeter web driver script for 100 user without open browser

when i was run jmeter webdriver script multiple browser is open and this condition not get accurate load testing report so how i get proper load testing report without open Browser?
As per WebDriver Tutorial
Note: It is NOT the intention of this project to replace the HTTP Samplers included in JMeter. Rather it is meant to compliment them by measuring the end user load time.
So you should not be using WebDriver Samplers to create the main load as browsers are very resource intensive and most probably you won't be able to kick off more than 5-10 browsers on a single machine.
If your requirement is to conduct the load testing using 100 real browsers - you will have to go for Distributed Testing
If you want to use existing Selenium tests as a basis for a protocol-based load test you should record them using JMeter's HTTP(S) Test Script Recorder. You can set the proxy for your WebDriver tests as follows:
So we have an option to run webdriver smaplers without opening the browsers if you are using chrome browser for this. You add jp#gc - Chrome Driver Config config element and there are 3 tabs in that those are "proxy", "chrome" and "Experimental". So you click on "chrome" tab and check the check box of Use Chrome headless mode. See the screenshot below.
In reality if you want to run webdriver samplers for more than 100 browser then I would suggest you that u use distributed test. Because browsers are resource consuming if you run around 4 browsers then your system starts hanging. so you cannot run 100 browsers. So go with Distributed testing in jmeter.

Selenium Golang binding without server

There are many selenium webdriver binding package of Golang.
However, I don't want to control browser throught server.
How can I control browser with Golang and selenium without selenium server?
You can try github.com/fedesog/webdriver which says in its documentation:
This is a pure go library and doesn't require a running Selenium driver.
I would characterize the Selenium webdriver as a client rather than a server. Caveat: I have used the Selenium webdriver (Chrome version) from .Net and I am assuming it is similar for Go.
The way Selenium works is that you will launch an instance of it from within code, and it creates a live version of the selected browser (i.e. Chrome) and your program retains control over it. Then you write code to tell the browser to navigate to a page, inspect the response, and interact with the browser by filling out form data, clicking on buttons, etc. You can see what is happening on the browser as the code runs, so it is easy to troubleshoot when the interaction doesn't go as planned.
I have used Selenium to upload tens of thousands of records to a website that has no API and only a graphical user interface. Give it a chance.

Executing the selenium tests from remote java application

We have are planning to design a system where we are planning to invoke the Selenium test that is present in a remote machine with url for testing. The selenium program should open 3 browsers for example IE, FF and Chrome and open the page and take a screenshot of it. Later These screenshots should be sent from this machine to the java application.
Is it possible to achieve this functionality ? If so could you please guide me on how to do this ?
Yes, you need to start a Selenium Grid/Node server on the remote machine that is configured to run all 3 browser types. That configuration isn't easy but it involves launching the grid from a .json config file. Then, your local program needs to just run the 3 tests either in 3 simultaneous threads, or one at a time using typical Selenium code.
Each test needs to define a Selenium Augmenter to get screenshots. There are lots of examples on Google.

steps for recording the selenium events on jmeter proxy

I am presently working on a project for which selenium scripts are prepared and i want my jmeter proxy should record the steps executed by selenium browser. I tried running selenium and jmeter proxy server on same port but while doing that proxy server of jmeter refuse to start on same port. I read somewhere that this is possible but i am not getting the steps needs to follow.
You should do the same what you will do for simple test recording through Jmeter proxy:
setup Jmeter HTTP Proxy Server;
start configured Jmeter Proxy;
configure and enable proxy settings in your test browser (used by selenium) to use Jmeter Proxy.
Then run your selenium tests as usual, via configured test browser - HTTP Proxy Server will record execution.
To exclude all the steps performed in the "selenium-server" window try to add the following to 'URL Patterns to Exclude' in HTTP Proxy Server settings:
^/selenium-server/.*
Useful point here is to separate recorded execution into different Thread Groups - e.g. separate Thread Group in Jmeter for each recorded selenium testcase.
Step-by-step guideline you may found here.
To tell the truth such the "re-recording" may appear not very useful and effective: JMeter is not a browser, and does not interpret the JavaScript in downloaded pages.
As per Jmeter wiki:
JMeter does not process Javascript or applets embedded in HTML pages.
JMeter can download the relevant resources (some embedded resources
are downloaded automatically if the correct options are set), but it
does not process the HTML and execute any Javascript functions.
If the page uses Javascript to build up a URL or submit a form, you
can use the Proxy Recording facility to create the necessary sampler.
If this is not possible, then manual inspection of the code may be
needed to determine what the Javascript is doing.
So if you need Jmeter possibilities to implement load/performance-testing based on existent Selenium functional scripts better for you then use run Selenium scripts from Jmeter.