Re: [extremeprogramming] The principle behind How Test-Driven Development Works

The work process is different for TDD at the unit level than at the system
level (acceptance, story slice, business goal, etc.).  In TDD at the unit
level, a new tests is written after each time the code satisfies the
previous test (and is refactored), whereas at the system level, several
tests are normally written before implementation starts and rarely are new
tests added at the system level during implementation of a story.

Further clouding the issues are customer ownership (or at least intimate
participation) in system level tests, which is why there has been an
evolution of how system-level tests can be written in customer-readable
language.  This issue then got further clouded with the emergence of BDD to
the extent that many believe BDD is only for acceptance testing.

On Thu, Nov 21, 2019 at 7:34 AM Chris Riesbeck <[email protected]>
wrote:

> I prefer "test-driven" over "test-first". Tests define what needs to be
> accomplished, in tiny slices, in some executable "clear when it's done"
> form. There's TDD with unit tests at the code task level, there's TDD
> with acceptance tests at the user story level, and there's TDD with
> business goals at the product level, e.g., reduced user error or
> increased usage of some feature.
>
> --
> ................................................
> Christopher Riesbeck (he/him/his)
> Associate Professor, Computer Science
> McCormick School of Engineering, Northwestern University
> Director, MS in Computer Science
> Co-director, The Center for Computer Science and Learning Sciences
>
> Home page: https://users.cs.northwestern.edu/~riesbeck/
> Calendar: https://users.cs.northwestern.edu/~riesbeck/calendar-weekly.html
>
>
> 
>
>

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