Figure 17-1. The recording screen of the Astra (Web design)
Figure 17-1. The recording screen of the Astra LoadTest application With Astra, as with most other web testing tools, each interaction with the web application can be recorded as a separate transaction. In Figure 17-1, each element in the tree view on the left-hand side of the screen represents a separate transaction that can be played back and have its performance metrics recorded. Once you start recording, all interaction between the client and the server is recorded, including request parameters and headers. You can then play back this recording and modify different parameters, such as the number of users executing the recording. Once you have the necessary test scripts, you can establish the baseline. The baseline measurement is normally taken with a single user using the application. Depending on whether you are conducting performance tests or are concentrating on load testing, the number of virtual users can vary. It’s typically a good idea to start with one user and scale upward. If the application is slow with a single user, it’s likely to be slow with multiple users. Figure 17-2 shows the testing script from Figure 17-1 running against the Storefront application with a single user. Figure 17-2. Testing the Storefront application with a single user
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