You use unit testing to verify that specific system behaviors produce the intended results. The purpose is to create a robust codebase with minimal cost and provide documentation for high-level testing such as functional testing and integration testing. Functional tests help verify that the output produces the expected user requirements.
This testing does the verification process. Dynamic testing does the validation process. Static testing is about prevention of defects. Dynamic testing is about finding and fixing the defects. Static testing gives an assessment of code and documentation. Dynamic testing gives bugs/bottlenecks in the software system.
Unit vs. Integration Tests. Wikipedia says about unit testing: In computer programming, unit testing is a software testing method by which individual units of source code, sets of one or more
Functional testing confirms that every feature within the code works with no bugs or errors. This assures the testers that the requirement specification has been met and assures stakeholders that the product is developed accordingly. Functional testing is one of the most important testing techniques when software testing occurs.
Even today, creating (and running) "real-world" integration tests often is harder than just mocking dependencies away, due to the lack of good tooling support for such tests; too often, it's just easier to "cheat" and create a bunch of unit tests with mocking, rather than take the trouble of creating real tests that truly exercise the code in a
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functional test vs integration test
