Integration tests are very similar to unit tests, and in most cases, novice programmers claim that they perform unit testing when they actually perform integration testing.
Integration tests drive the code but do not test the individual classes (units) in isolation, mocking everything that the class may use. Rather, they test the functionality of most of the classes that are needed to perform a test. This way, the integration test does test that the classes are able to work together and not only satisfy their own specifications but also ensure that these specifications work together.
In the integration test, the external world (like external services) and access to the database are mocked. That is because the integration ...
