Unit testing is a technique of testing different parts of your product that can work and be tested separately on early stages of development. They are usually written by developers to make sure that their code design matches requirements and behaves as expected. The main aim of unit tests is to analyze the system, define a unit, test it and fix found issues.One of the best approaches to unit testing is creating a test before the main development process starts - this is called test-driven development or a test first approach. Once tests are written development starts and the whole process is divided by segments. Each segment involves creating a unit, testing it and bug fixing. Once all issues are fixed and unit functions properly developer starts working on a next unit.
In some cases when a semi-independant feature is developed unit testing can be done by manual QA team and include testing of UI, UX and functional components.Unit testing is one of the basic components of test-driven development, however it can be easily integrated in any development methodology. It should be done before integration testing and allows to make sure separates units are functioning before testing interaction between them.
While having only one significant downside, which is a time consumption aspect of planning, writing and executing unit tests, this technique provides a greate range of advantages.
Contrary to popular belief unit testing does not mean writing twice as much code, or coding slower. It's faster and more robust than coding without tests once you've got the hang of it and DeviQA`s teams have great experience in providing unit testing services for projects of any complexity and size.
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