Automated functional tests of User Interfaces

This was a dialogue of the concepts behind the automation of indirect functional and integration testing via the events and controls of a User Interface (UI).

“NamePlateValidation has a good example of an automated UI functional test. It sends keystrokes into the UI via events (because each textbox control has a text change event on each keystroke, not just on Enter key or lostfocus or a button click.) For other screens, if there’s no event on individual keystrokes, setting the value of textbox.Text then sending the button click event is sufficient – generally, follow the events caused by the anticipated user process.

“Then, the test harness can check whether the UI controls that are supposed to update are actually updated with the expected values. Or if that immediate validation is not easily automated, the test harness can ask the user if it that area of the displayed UI looks good. (That should be done only when necessary.)

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“Why might it not be easily automated?

“Because timing of event results versus the test harness could be out of sequence – particularly if the event triggers a remote database query over VPN, and the test harness is running locally. The local harness can advance to its next step far faster than the UI responds to the data request. (It would be possible to build in a fixed delay or a notification event that indicates the UI is ready for validation… That would increase the duration required to run tests, so may not work well.)

“This technique is a combination of functional testing and integration testing. It still requires human hands-on for “look-and-feel” acceptance testing, but the UI data can be (mostly) automatically validated.”

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