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Testing

Testing is central to creating working software. Here’s the canonical statement describing the importance of testing:

”Any program feature without an automated test simply doesn’t exist”.

(Kent Beck, Extreme Programming Explained: Embrace Change)

We can distinguish several kinds of testing:

Unit testing:

This applies to independent units of software: functions, classes, or modules. The unit is tested in isolation to confirm that it works correctly.

Integration testing

: This combines units to be sure they integrate properly.

System testing

: This tests an entire application or a system of interrelated applications to be sure that the suite of software components works properly. This is also called end-to-end testing or functional testing. This is often used for acceptance testing to confirm that software is fit for use.

Performance testing

: This ensures that a unit, subsystem...