Unit Testing Is Very Critical For A Program
Computer programs are prone to various problems. So,,various tests are run to check any problems in the program. One of these tests is unit testing, which is done to check if the individual units of source code are working properly.
As stated above, unit testing is performed on individual units. In an application the smallest part which can be tested is called a unit. In case of a procedural programming, an individual program, function or procedure is called a unit. A method is the smallest unit in the case of an object-oriented programming. The method may belong to an abstract class, a base/super class or a derived/child class.
Unit testing is never performed by the end users. Instead, it is done by developers. Every test case is different from the other one. If a module has to be tested in isolation, then test harnesses and mock objects should be used.
Unit testing is a really beneficial process. The best part is it isolates each part of a program, and shows the correction of the individual parts. Apart from this, it provides various benefits. It facilitates change in a way the user can re-factor the code at a later date. The best thing is that unit testing ensures the module continues to work correctly. This process is known as regression testing. It is done in a way that the fault can easily be identified and fixed. It is done by writing down the test cases, for all functions and methods. Another benefit of unit testing is that it helps the developers eliminate any uncertainty in the units. It can also be used in a bottom-up testing style approach. It also makes it easy to perform an integration testing as the parts of a program are tested first, and then the sum of its parts is tested. The developers can obtain a living documentation of the system through unit testing. The unit test can also provide the developers with a very basic understanding of the unit API. This benefit is especially there for developers who want to know about the functionality provided by a unit. Another benefit is that the characteristics, critical to a unit's success, are embodied by unit testing. An appropriate or inappropriate use of a unit can also be indicated by these characteristics. The negative behaviors trapped by the unit are also indicated. These critical characteristics are automatically documented by unit testing. This solves the problem of documentation, although many developers do not entirely rely on this automatic documentation, done by the codes or the units themselves. Still, one thing is for sure, Unit testing, as a process, is very critical and very beneficial, for a program.
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