Stage. It is the first step in any testing process. Functional testing is performed after the unit testing is done. User acceptance testing is the last step in the testing process and is done after the deployment of the software on the client side. Integration testing is done after the unit testing and functional testing are completed.
It requires more resources. The cost of unit testing is less as compared to system testing. The cost of system testing is high as compared to unit testing. The goal of unit testing is to validate the functional requirements. The goal of system testing is to check the system validation. It is performed by developers.
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functional test vs unit test
