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How is regression testing performed in Java? Are there automated regression test frameworks or do you just write (JUnit) unit tests that help ensure against regressions?
Is there a way or set of best practices for coding unit tests so that they also serve the dual purpose of being regression tests, or do you need to keep regression tests separate from your unit tests?
JUnit is generally aimed for unit tests rather than full-scale functional testing (of which regression testing is an example if one is looking at the system as a whole).
However, it is not uncommon to use a separate test suit to perform “heavy” functional and integration tests that connect to actual backends, etc., and verify results against expectations.
One reason for the use of JUnit here is the ability to go from ‘mocked tests’ to actual functional tests using dependency injection. You could provide, for example, a mock collaborator in the lighter test, and an actual collaborator instance in the full functional test.