re: What are the alternatives to unit tests? VIEW POST

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Unit tests have the greatest ROI when either

  • the feature is business-critical and/or is very unlikely to change requirements (to guard against regressions)
  • the feature is an algorithm with plenty of edge-cases (to fascilitate develepment and guard against regressions)

On the other hand, unit tests have very low ROI when a feature is not business-critical and has requirements that change very frequently.

Note that the value of unit tests is like everything else: it depends.

As to alternatives, I’ve had cases where API tests (on a running test instance of the application) provided an immensely high ROI. Integration tests, in the sense of testing the collaboration of a chuck of your codebase, those have for me always had a low ROI, because of the effort in setting up while still only resembling actual production behaviour (due to the mocked parts).

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