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Please let me know what you think. Writing test cases for performance testing requires a different mindset to writing functional test cases.
Fortunately it is not a difficult mental leap. This article should give you enough information to get you up and running.
First, lets set out some background and define some terms that are used in performance testing. Just as with a functional test case, it outlines test steps that should be performed, and the expected result for each step.
Virtual users do not run test scripts using the Graphical User Interface like a functional test case that has been automated with tools like WinRunner, QuickTest, QARun or Rational Robot ; they simulate a real user by sending the same network traffic as a real user would.
A single workstation can run multiple virtual users. It outlines how many times an hour they will be run, how many users will run each test script, and when each test script will be run.
The aim of a scenario is to simulate real world usage of a system. Writing a test case for performance testing is basically writing a simple Requirements Specification for a piece of software the test script. Just as with any specification, it should be unambiguous and as complete as possible.
Every test case will contain the steps to be performed with the application and the expected result for each step. As a performance tester will generally not know the business processes that they will be automating, a test case should provide more detail than may be included in a functional test case intended for a tester familiar with the application.
It is important that the test case describes a single path through the application. Adding conditional branches to handle varying application responses, such as error messages, will greatly increase script development time and the time taken to verify that the test script functions as expected.
If a test script encounters an error that it does not expect, it will usually just stop. If the Project Manager decides that test scripts should handle errors the same way a real user would, then information should be included on how to reproduce each error condition, and additional scripting time should be included in the project plan.
The main reason a user may be presented with a different flow through the application is the input data that is used. Each test case will be executed with a large amount of input data.
Defining data requirements is a critical part of planning for a performance test, and is the most common area to get wrong on a first attempt. It is very easy to forget that certain inputs will present the user with different options.
The other important data issues to identify are any data dependencies and any potential problems with concurrency. Is it important that data is used in some business functions before they are used in others?
And, will data modified by virtual users cause other virtual users to fail when they try to use the same data? The test tool can partition the data used by each virtual user if these requirements can be identified.
It can be difficult for a performance tester to debug test script failures with little knowledge of the application, especially if the failures only occur when multiple virtual users are running at once. Any test cases provided to a performance tester should clearly define the start and end points for any transaction timings that should be included in the test results.
It is important to remember that the test script is only creating the network traffic that would normally be generated by the application under test.
This means that any operations that happen only on the client do not get simulated and therefore do not get included in any transaction timing points. Starting the client application takes 10 seconds and logging in takes 5 seconds but, since only the login is sending network traffic to the server, the transaction timing point will only measure 5 seconds.
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.On the night of February 26, , in Sanford, Florida, United States, George Zimmerman fatally shot Trayvon Martin, a year-old African American high school student.
Zimmerman, a year-old mixed race Hispanic man, was the neighborhood watch coordinator for his gated community where Martin was visiting his relatives at the time of the shooting.
A feisty herd of B.C. mountain goats seeking a salt fix from the highway has been thwarted by crafty ministry wildlife specialists. Continue reading →.
Since his death in the Elvis world has experienced various tabloid fuelled stories which have gained varying degrees of public and fan interest. Shelby Allen was 17 years old when she was found dead in the bathroom of the Liberman home near Redding. Her alcohol content was at the time of her death.
According to testimony, Kayli Liberman—then 16—propped up her friend’s head against a toilet and closed the bathroom door behind her, after Shelby consumed 15 shots of vodka. In , the District Attorney, Memphis Police Department (MPD), Shelby County Sheriff's Office (SCSO) and Tennessee Bureau of Investigation (TBI) signed a memorandum of understanding changing the manner in which officer involved death investigations are conducted and handled.
During Sugar’s lifetime, he managed every aspect of the business, but after his death in October, , the new board of directors failed in hiring a suitable business manager, until , when they hired Shelby Givens (Sugar’s granddaughter).