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7 Reasons Why Unit Testing is Important

woodjessica profile image Jessica Wood ・3 min read

Unit testing is often associated with several difficulties because it doesn’t have a common opinion among development and management. But, it should be understood that it is a very important practice in software testing. Instead of considering how unit testing affects the overall software development time, teams should understand the advantages it assures to provide. By understanding the complete reasons why it is essential, it becomes easier to understand why unit testing is so important for achieving faster and quality applications.

Unit testing is one of the testing phases in the software development lifecycle (SDLC). It is the initial testing phase where the smallest components of the software are tested individually. This is a very important testing practice, where the developers perform unit testing by writing test cases to ensure that the code is working efficiently. This testing practice efficiently helps in identifying and resolving the bugs at the earliest and before they become expensive to resolve.

But, there are certain scenarios where enterprises prefer to skip this testing practice without knowing the actual benefits it provides in the SDLC process. Thus, it becomes very important for the teams to understand the reasons why unit testing is essential.

What is Unit Testing?

Unit testing is the initial software testing phase performed by developers. In this method, the developers test the smallest code of the application independently to ensure its functionality. The main objective of Unit testing is to isolate the written code and then test them for verifying their functionality.

Some teams ignore this test practice thinking it is time taking, but it is one of the major test practice for testing a software.

What are 7 reasons for performing Unit tests?

Bugs are identified faster: Unit testing is practiced at the early stage of the SDLC by developers. This way of performing unit testing before the integration practice will effectively help in identifying and resolving bugs at the early stage.

Documentation helps New Developers: Unit testing is practiced with a set of documentation. This way of having documentation will effectively help other developers in learning the functionality of a unit. With the unit test documentation, it will be easier to understand the Application Programming Interface (API).

Helps in saving time and money: By practicing unit testing at the early of SDLC, bugs are identified and resolved at the starting stage of development. In this manner, bugs are no more carried for other stages and get resolved at the earliest. This efficiently helps in saving the time and money for fixing the bugs. 

Simplifies Debugging process: With the practice of unit testing, the debugging process is effectively simplified. Thus, the debugging process can be performed only when there are any new changes made to the code. 

Enhances the Code Quality: During the unit testing practice, every line of code is well verified and then processed for the further integration process. In this way, the quality of code is balanced from the beginning itself by eliminating all the bugs and problems.

Reusable and reliable code: In the unit test practice, the smallest units of the code are tested in isolation and thus have their individual area of responsibility. This ultimately makes the code more reliable and assures to have reusable code.

Reduces Code Complexity: While developing applications, it is essential to develop code with less complexities; because the lesser complicated the code is, the easier it becomes in enhancing the code coverage. This can be achieved when teams effectively practice unit testing.


Unit Testing is the software testing phase that is performed at the early stage of the SDLC by developers. It is the first testing phase where developers write test cases to validate the code that is being written for app development. Considering this to be time-taking, a certain percentage of teams avoid practicing unit testing without knowing the actual benefits that are achieved with unit testing. The above-mentioned are 7 important reasons that clearly determine why the practice of unit testing is important in SDLC. Leverage unit testing services from next-gen QA testing services provider to make the software testing practice efficient from the initial step itself.

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