Performance Testing on CI: Integration of Locust and Jenkins

It is a raising question around performance testing people that how to integrate, super hero tool,Locust to Jenkins as a step to continues integration (CI) pipeline. There have been some solutions for this but they are not simple, plus you need to write own log writer to handle this problem. Actually there was a commit to save the result of the test but it has not been merged to Locust. With these commit we can integrate Locust to Jenkins.

Update Locust

This update is still open so you can not see it in latest Locust version yet. However you can use this by updating your local repository, or just change two files main.py and stats.py with the files in your local. For Window change the files in the following directory: C:\Python27\Lib\site-packages\locustio-0.7.3-py2.7.egga\locust\stats.py and for Unix-base OS change the files in the following directory: /Library/Python/2.7/site-packages/locust/stats.py. Alternatively, you can clone this commit from github and install by python setup.py install.

Fix the Bug of The Locust Update

It was committed on Jul 12, 2015 but it is still in review status and it has a bug. If they haven't solved it I have added just the following lines of code to fix it. You should find the store_stats(filename, stats)function in stats.py at line 499 and change it with the following function:

Add Build Parameters

Basically, with the performance, we should check the response time with pre-defined treshhold, if any failures and if any redirections. Therefore we need to add some steps to check the log file if these criteria are passed. Instead of defining performance criterias into code directly, I added there build parameters to check min_respons_time, max_response_time and avg_response_time, because these may changes over the time.

Run Locust

If you update your code, you can run your tests with adding new parameters --statsfile=result.log by that you will save the result into result.log file. This file will be present in workspace. The whole command should look like, for Windows I am adding a Window batch command:

C:\Python27\Scripts\locust.exe -f C:\Users\Administrator\Documents\performance\amazon.py --clients=20 --hatch-rate=1 --num-request=500 --no-web --only-summary --statsfile=result.log

Evaluate Test Result

To check the log file create a build step to with execute python script, to add this you need to add python code executer plugin. Then add the following code into this step:

Run the Job

Save the job and click "Build with Parameters", set the values for each then click the "Build" button.

Check the Job Result

Click build number and then click console log to the result of the job.

Selenium Error "Element is not currently interactable and may not be manipulated"

Selenium webdriver can drive different browsers like as Firefox, Chrome or Internet Explorer. These browsers actually cover the majority of internet users, so testing these browsers possibly covers the 90% of the internet users. However, there is no guaranty that the same automation scripts can work without a failure on these three browsers. For this reason, automation code should be error-prone for the browsers you want to cover. The following error is caught when the test script run for Chrome and Internet Explorer, but surprisingly there is no error for the Firefox. Selenium gives an error like below: Traceback (most recent call last): File "D:\workspace\sample_project\sample_run.py", line 10, in <module> m.login() File "D:\workspace\ sample_project \test_case_imps.py", line 335, in login driver.find_element_by_id("id_username").clear() File "C:\Python27\lib\site-packages\selenium-2.35.0-py2.7.egg\selenium\webdriver\r

Change Default Timeout and Wait Time of Capybara

One of the biggest challenge for automation is handling timeout problem. Most of the time, timeout is 60 seconds but it may sometimes not enough if you have badly designed asynchronous calls or the third party ajax calls. This makes handling timeout more complex. set large enough to tolerate network related problems. For Selenium based automation frameworks, like Capybara, default Webdriver timeout is set to Net::ReadTimeout (Net::ReadTimeout) Changing ReadTimeout If you have timeout problem for Capybara, it gives an error like above. This means that the page is not fully loaded in given timeout period. Even you can see that page is loaded correctly but webdriver wait until the Ajax calls finish. class BufferedIO #:nodoc: internal use only def initialize (io) @io = io @read_timeout = 60 @continue_timeout = nil @debug_output = nil @rbuf = '' end . . . . . def rbuf_fill beg

Create an Alias for Interactive Console Work: Selenium and Capybara

If you are working on shell most of the time Aliases are very helpfull and time saving. For testing purposes you can use Alias for getting ready your test suites. In this post, I want to explain both running Selenium and Capybara on console and creating aliases for each. This post is for Windows machines, if you are using Unix-like see this post . Creating Scripts for Selenium and Capybara First of all, it is assumed that you have installed Selenium and Capybara correctly and they work on your machines. If you haven't installed, you can see my previous posts. I am using the Selenium with Python and the Capybara with Ruby. You can use several different language for Selenium but Capybara works only with Ruby. Create scripts in a directory called scripts (in your home folder, like as ~/scripts ) for your automation tool as following, save them as capybara.rb, sel.py : Creating Aliases Depends on your favourite shell, you need to add the alias to .bashrc bash

Page-Object Pattern for Selenium Test Automation with Python

Page-object model is a pattern that you can apply it to develop efficient automation framework. With the page-model, it is possible to minimize maintenance cost. Basically page-object means that your every page is inherited from a base class which includes basic functionalities for every page. If you have some new functionalities that every page should have, you can simple add it to the base class. Base class is like the following: In this part we are creating pages which are inherited from base page. Every page has its own functionalities written as python functions. Some functions return to a new page, it means that these functions leave the current page and produce a new page. You should write as much as functions you need in the assertion part because this is the only part you can use the webdriver functions to interact with web pages . This part can be evaluate as providing data to assertion part. The last part is related to asserting your test cases against to the

Performance Testing on CI: Locust is running on Jenkins

For a successful Continuous Integration pipeline, there should be jobs for testing the performance of the application. It is necessary if the application is still performing well. Generally performance testing is thought as kinds of activities performed one step before going to live. In general approach it is true but don't forget to test your application's performance as soon as there is an testable software, such as an api end point, functions, and etc. For CI it is a good approach to testing performance after functional testing and just before the deployment of next stage. In this post, I want to share some info about Jenkins and Locust. In my previous post you can find some information about Locust and Jenkins. Jenkins operates the CI environment and Locust is a tool for performance testing. To run the Locust on Jenkins you need command line arguments which control the number of clients , hatch rate, running locust without web interface and there should be so

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