Unit testing vs. functional testing: What's the difference?
What is unit testing? It is a testing method where the smallest piece of code known as a unit is tested. A unit can be a method, subroutine, function etc. These units are also called as the individual components of a software application. Unit tests are written by developers for their code, in order to check whether the code is working correctly. A section of code is isolated and then its correctness is verified in this particular testing method. The cost of testing is reduced as defects in an application are found at the early stages of software development. What is functional testing? It is a type of software testing where the software system is validated against the functional requirements/specifications. Each function of the software application is thoroughly tested in this testing method. Appropriate input is provided and then output is verified against the functional requirements. This testing method checks the client/server communication, security, database, APIs...