What are unit tests? Discover what they consist of and other matters of interest

Have you heard about unit testing? Do you really know what it consists of? Software unit tests are an essential component in the development of websites and mobile applications. That's why it's essential that you know the details about these tests.

In this article, we tell you everything about this topic. We will focus on what unit tests are, what they are for, and why they are important. We will also show you the advantages these tests offer. Keep reading!

What are unit tests?

Unit tests are a software verification method whose objective is to evaluate each individual unit of code in isolation. To clarify, a unit of code can be a function, a method, or even a line of code.

What are unit tests for?

Unit tests serve to ensure that each piece of the puzzle works correctly on its own before integrating them into the overall project. More specifically, they help detect and correct errors in early stages of development, thus guaranteeing the stability and reliability of the system.

Characteristics of unit tests

The characteristics of unit tests are diverse. Below, we show you some of the most important ones:

• Automation: This characteristic is essential for streamlining the code verification process. Automation also ensures that tests can be performed consistently, reducing the possibility of human errors.
• Repeatability: Constant repeatability gives developers confidence, as they can be sure that adjustments and improvements do not generate unexpected side effects.
• Isolation: Isolation facilitates the identification and correction of errors efficiently, without the complexity of interdependent problems.
• Speed: Unit tests are designed to execute quickly. This characteristic is essential for integrating tests into the developer's daily workflow.
• Continuous integration: This ensures that any code change is evaluated immediately, ensuring the stability and continuous functionality of the system.

Why is it important to perform unit tests?

It is important to perform unit tests for several reasons. First, with these we can reduce errors. By identifying and solving problems in an early stage, we prevent them from accumulating and becoming harder to solve later. Additionally, they facilitate collaboration in development teams by providing a common quality standard.

The 3 A's of unit testing

The 3 A's of unit testing are:

• Arrange: Prepare the test environment, establishing initial conditions and configuring necessary objects. At this point, the requirements that a certain code must meet are defined.
• Act: This is when the action in question is performed, i.e., the unit test is executed, giving us the results that we will need to analyse later.
• Assert: In this stage, the results are analysed to make decisions. If the result of the action is as expected, you ensure that the code works correctly.

Unit testing: tools to carry it out

Although unit testing can be done manually, the most common approach is to automate the procedure through tools. Some of the tools for carrying out unit testing are:

• xUnit
• Junit
• NUnit
• PHPUnit

Advantages of software unit tests

The advantages of software unit tests are numerous. In addition to preventing errors and improving collaboration, we can highlight other advantages:

• They speed up the development process.
• They facilitate the detection of unexpected changes.
• They improve code documentation by providing practical examples of how each unit should be used.

In summary, unit tests are very useful for software development, becoming an indispensable practice. Unit tests are synonymous with quality, stability, and code reliability, as they allow developers to build robust and successful projects. At Digizone Labs, mobile and web application developers, we are here to help. Contact us to turn your dream project into reality!