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Continuous Integration, Delivery, and Deployment by Sander Rossel

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Integration tests

Checking whether an Add function really adds a and b is nice, but does not really give you an indication that the system as a whole works as well. As said, unit tests only test small and isolated units of code and should not interact with external components (external components are mocked). That is why you will want integration tests as well. Integration tests test whether the system as a whole operates as expected. We need to know whether a record can indeed be saved in and retrieved from a database, that we can request some data from an external service, and that we can log to some file on the filesystem. Or, more practically we can check whether the frontend that was created by the frontend team actually fits the backend ...

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