Question

BDD has been touted as “TDD done right”.

However TDD is widely used with unit tests, rather than end-to-end integration tests.

Which kind of test is most appropriate for BDD?

• Should we write only integration tests?
• Should we also write unit tests?
  • If yes, should there be multiple unit-tests per scenario?
  • And what a unit test covers multiple scenarios? Is there a way to structure these tests when using a testing framework such as MSpec?

Answer 1

Which kind of test (integration tests, unit tests) is most appropriate for BDD?

I would use both in two nested loops as described in Behavior-Driven Development with SpecFlow and WatiN

* writing a failing integration tests
    * writing a failing unit test as part of the solution of the integration test
        * making the unittest pass
        * refactor
    * writing the next failing unit test as part of the integration test

    * unitl the integration test passes

* writing the next failing integration tests