Unit Test vs Integration Test | Major Difference between Unit Testing and Integration Test

Developing a quality software is considered incomplete without writing tests. Not only does the test assure the quality but it profoundly helps developers while refactoring or re-writing a piece of code. When it comes to testing, having well-planned and thorough testing throughout the software development cycle is very important. The most commonly used types of tests today are unit tests and integration tests.

Even though these two approaches are complementary, it’s important to understand the difference between unit testing vs integration testing.


UNIT TESTING

In programming, unit testing is a practice by which every single unit of source code is tested to decide if it is fit for use. A unit is the tiniest testable part of an application. In programming, a unit can be an individual function or procedure. Unit tests are generally created by programmers or sometimes by white box testers.The ultimate goal of unit testing is to separate each part of the program and show that the individual parts of the code are correct. Unit testing is also the core of an advanced software development process called test-driven development. The aim is to have the framing of a single unit roll out before its recognition.

Benefits of Unit Testing:

Facilitates change:

  1. Unit testing lets the programmer to restructure code at a later date, and make sure the code still works correctly Simplifies integration
  2. Unit testing may decrease the uncertainty in the units and can be used in a bottom-up testing style. By testing the parts of a program first and then testing the integration part easy , which also makes integration testing much easier.


INTEGRATION TESTING

The testing of a component or module of code to ensure it integrates correctly with other components or modules of code. In an Agile or DevOps exercise where continuous delivery pipelines are common, integration testing should be carried out as each module is completed or adjusted. To ensure that these other areas of the application are still functioning correctly, every feature of the application must be re-tested to make sure it’s functioning as designed. This end-to-end preventative testing is called regression testing. You can replace outer systems, but the application works in an integrated way. This approach can be used for the verification in a CI/CD pipeline.


UNIT TESTING AND INTEGRATION TESTING IN CI/CD

Unit testing and integration testing both play a crucial part in successful software development. Even though they are different yet related purposes, one cannot completely replace the other. They accompany each other perfectly. Automating tests in CI/CD pipelines is regarded as a best practice, if not mandatory according to most DevOps principles. Development teams must focus to create an efficient, reliable test layout for their projects, one that covers all appropriate code paths. Automation of tests in your CI/CD pipeline should be a high priority for your team. A fusion of testing methods can increase the test coverage and make your software as bug-free as it can be.


Unit Test vs Integration Test:

UNIT TESTING INTEGRATION TESTING
PURPOSE Testing the smallest units or modules individually Testing integration of two or more units/modules
Complexity Easy to write and execute More complex than unit testing
Major Attention Individual units/modules Integration of units/modules
Condition Checks for single component Checks for multiple components in combinations
Errors/Issues Covered Finds errors that occurs frequently Finds issues that occur while integrating two or more modules
Team Involved Performed by the developer performed by the tester


Conclusion:

Unit testing is the most basic part of CI/CD which allows faster development cycles and continuous deployment. In addition to this, it also helps to improve the overall code quality for each release. Integration testing is the most commonly preferred method of testing because it offers the well organized use of development and testing resources. Tests can be carried out on each module as soon as development on it is done. Developers can regularly test it very rapidly, making any necessary changes to the code immediately.



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About The Author

Shyam Mohan

DevOps Engineer

Shyam Mohan is a DevOps Engineer and he has 14+ years of experience in the areas of Software Development, Devops, CI/CD, Kubernetes, and he also guides companies to adopt CI/CD pipelines which will help them to automate their workflow.





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