Importance of Unit Testing in Software Development

Software Testing is the most important phase of System Development Life Cycle and is defined as the investigation performed to check whether the actual results match the expected results and ensures the quality of the software. Software testing helps us to understand the risks of software implementation in the better way. Testing includes complete process of executing program and works for finding the bugs or the other defects coming in the software. With Testing, one can identify all the defects within the software. The main purpose of testing is to fix the software failures so that the final product when delivered will be bug free and possesses all the requirements provided by the client.

Introduction to Unit Testing:

Unit testing is the initial phase of testing where smallest modules of the software are tested individually. With this method of testing, to identify and fix the system issues is easy as tester and developer can isolate each module and identification of defects is done at the very early stage of the SDLC. The Unit testing possesses three phases. At the first phase, it initializes a small piece of an app. The addition of stimulus in the system is done under second phase of testing and in the final and third stage, it observes the resulting app performance. These three phases are called by names as arrange, act and assert commonly known as AAA. This testing approach helps the programmer to test the individual unit of the code to check whether it is working properly or not.

Some of the developers may perform minimal unit testing to save time but when unit testing is skipped, it is obviously lead to higher cost at the time of final system testing  i.e integration testing and also at the beta testing when the app is completed.

Benefits of Unit Testing:

Improved Code design:

The code design and quality automatically improves when unit testing is done, especially in test-driven developments (TDD). In test driven development, very minimum amount of code is required to make the test pass and very least bugs are found during integration phase of testing.

Identify Software Bugs at early stage:

In the software build process, by adding the unit testing or as part of the Continuous Integration process, as the code base grows larger, these tests run automatically. When a failure occurs, either the failure is caused by a bug in the code or a problem with the actual Unit Test. Either way, pinpointing the location of failure is easily traced. Unit testing is the best way to know about the failures in the software  early on so that development team is able to check and resolve the bug as early as possible.  So it must be added in your daily work routine.

Simplifies Integration:

Unit Testing assures the accurateness of the each module. Afterward, the individual Units are then integrated into an application. By testing every single module of the application via Unit Testing, later testing of the application during the Integration process is easier due to the verification of the individual Units.

Improves Team Work:

Unit testing improves team work as developers and testers review the logic of each other’s behind the code which makes team as agile and cohesive.

Ability to Reuse Code:

As unit testing helps to test every single module of the software and reduce test cost during integration testing phase. So in this way all modules are tested and developer can easily use the same code once again.

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