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Dragonflieslike this common clubtail with captured prey, are invertebrate pursuit predators.

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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.

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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.

How to write a performance test case

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.

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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.Few books take the country by storm so quickly, but that’s exactly what Andy Weir’s The Martian did.

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Devil In The Dark () The Horta was an example of Silicon life.; Now we are really sailing off into terra incognito. "Here be dragons" and all that. But if you have starships, you almost have to have aliens (Isaac Asimov's Foundation trilogy being the most notable exception).The "science" is called Astrobiology, the famous "science in search of a .

What process best describe the process of onboarding