Unit tests and integration tests are tools, some tools are better at some tasks then others. The idea that a single tool is the only one you need is preposterou

Unit tests and integration tests are tools, some tools are better at some tasks then others. The idea that a single tool is the only one you need is preposterous. If you are writing a library write unit test, if your app mostly binds two libraries together unit tests are meaningless, write integration tests.