How to write a performance test case
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If no think time is included, virtual users will execute the steps of the test case as fast as they can, resulting in greater and unrealistic load on the system under test. Depending on the sophistication of the performance test tool, the user think time may be automatically excluded from the transaction timing points. Think times are generally inserted outside of any transaction timing points anyhow.
While a functional test case will be run once from start to finish, a performance test case will be run many times iterated by the same virtual user in a single scenario. Information on how the test steps will be iterated should be included in the test case.
For example, if a test case involves a user logging in and performing a search, and the entire test case is iterated by the virtual user; then a test scenario may be generating too many logins if the real users generally stay logged into the application.
When a script is iterated, consideration should be given to the non-obvious details of how it is iterated. A good example would be a test script simulating users using an Internet search engine. When the test script is iterated, simulating a new search operation, should the virtual user establish a new network connection and empty their cache or should every iteration simulate the same user conducting another search?
As all performance test tools have different default behaviours, a good performance tester should clarify this type of detail with business and technical experts. Some performance test tools make these details easier to change than others. If it is not practical to emulate all the attributes of the expected system traffic with a particular tool, then it should be noted as a limitation of the performance test effort, and a technical expert should assess the likely impact.
Hopefully this article has provided some insight into the extra considerations that must be given when writing a performance test case, rather than a functional test case. As with any software specification, a performance test case may need to be refined as questions are raised by the performance tester.
An example test case: Your performace test case topic is awsome, it does help me lots. However, I am wondering if there is a standard for software performance testing??? What I mean is some thing define how a high-quality software unit sould pass a performance test, for example, reaponse time must be. Hi Stuar, Your explanation about writing test cases are very good. Can you please tell me how to write test cases for regression testing.
As suppose there is an enhancement in the mid portion of the application and since we will be over with writing test cases how will we write the new test cases from the middle. Will it not be confusing. Please clarify this doubt. Hi Sutar, Very interesting to go through the details. Well I have been in Testing for over 5 years but have never got an opportunity to do performance testing, but here comes 1 now.
I am wondering if you could help me here. Please write in to me at ronak. This is kind of really urgent, hoping to talk to u soon. Your explanation is wonderful. This artical helped me a lot. I have a question on formance test planning. Please give your contact details phone number or mail id. Your explanation is wonderful for writing test case.
I would like to know that the created stress script for testing enviornment can be helpful for production environment??? If yes then how to replace the prod url with test url. I am working on the application where there are 3 environments and I have to create a script for each environment.
Now, I am looking forward to use the single script for all 3 enviornments. It will be great if you can help me out for the same. Your explanation about writing test cases are very good. Can you please tell me how to write test cases for DNS load testing.
Your article is very interesting and informative. I find it useful to my current line of field. I was just wondering if you also could write some examples as well as articles on test case specifications against scenarios in the near future. Hi, Your explanation is good.
I liked to ur way of presentation about the performance testin. I want You to give a good example of regression testing and functionality testing. Hi I need some of the real time test cases on an existing application.
Can you please provide me. I would be thankful if you do so. Do you think a career in performance testing might be suitable for me based on this?