Described concisely and directly, Unit Tests is Quality Assurance (QA) for the core of your software. The main difference between Unit Tests and regular QA is that Unit Tests are not done by a user interacting with the software directly. In fact, they are done by a programmer with code.
The core of the software is the code that relates directly to that objective.The core is essential. If it does not function correctly, the software has no purpose.
Examples of software cores:
Hotel Booking Engine
In a controlled environment, QA tests every core function possibility, making sure nothing breaks and everything works as expected. The core is outlined clearly with every one of its cases for QA to test continuously.
For instance, take a basic calculator (a relatively simple, single page application) that uses 4 basic functions. At first, QA needs to test the calculator’s 4 basic functions. However, to ensure quality, QA needs to test every possible combination of functions at one time.
For a basic calculator application that has four functions, QA needs to run 15 tests continuously to ensure it works properly.Each scenario should be tested with its own input and all outputs need to be verified. Now imagine another a new function is added to the app, for example, the trigonometric function sine. You have to test all the above functions again, but this time with the sine code added.
With the addition of 1 function, the number of tests increases from 15 to 31. The addition of 1 function doubles the number of tests to perform and forces QA to repeat tests. A typical scientific calculator includes at least 13 functions: add, subtract, multiply, divide, percent, sine, cosine, tangent, square root, nth root, exponent, log, factorial.That yields a grand total of 8191 different test cases to perform!
This amount of QA is not feasible for a person to perform. Hence, unit tests. In addition, Unit Tests are QA for the software core done by machine calculations, therefore free of human errors.
|It (when)…||Code to be tested.|
|Should (then)…||Evaluation of results.|
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