Below are some of the disadvantages
More code: In projects with high test coverage it’s possible to have more test code than functional code.
More to maintain: When there is more code, there is more to maintain.
No silver bullet: Unit tests don’t (and can’t) ensure that your code is free of bugs.
Takes longer: Writing tests takes time — time you could spend learning new exciting stuff on raywenderlich.com!
Below are some of the advantages however
Confidence: You can demonstrate that your code works.
Quick feedback: You can use unit tests to quickly validate code that is buried many layers deep in your app navigation — things that are cumbersome to test manually.
Modularity: Unit tests help keep you focused on writing more modular code.
Focus: Writing tests for micro features keep you focused on the small details.
Regression: Be sure that the bugs you fixed stay fixed — and aren’t broken by subsequent fixes.
Refactoring: Until Xcode gets smart enough to refactor your code on its own, you’ll need unit tests to validate your refactoring.
Documentation: Unit tests describe what you think the code should do; they serve as another way to document your code.
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