"Mark Wilden" <[EMAIL PROTECTED]> writes: > On Mon, Nov 24, 2008 at 10:29 AM, Pat Maddox <[EMAIL PROTECTED]> wrote: > > I disagree with the part about edge cases. Acceptance Tests are about > defining and verifying business value, and edge cases are supremely > valuable to businesses. What happens when an ATM user tries to withdraw > $1 more than he has available in his account? > > Withdrawing $1 more than available is an edge case, vulnerable to an > off-by-one error, and doesn't need to be shown to business, in my > opinion. Testing that is a means of detecting errors - it's not a > specification.
I respectfully disagree :) In my hypothetical example, the specification is what to do when someone withdraws more than they have in their account. Then when you write scenarios, the simplest thing you can do to show that is the edge case itself, which is in fact valuable. $1 over is (probably) the same as $100 over, and I think that $100 raises more questions than it answers. Why is it $100? Is there some business rule that charges a penalty if they go $100 over the limit, but not less? Pat _______________________________________________ rspec-users mailing list [email protected] http://rubyforge.org/mailman/listinfo/rspec-users
