On Wed, Nov 17, 2010 at 12:19 AM, Luc Maisonobe <luc.maison...@free.fr>wrote:
> > In Mahout, we did this by having a static method in a utility class for > > getting a standard generator for either testing or normal operation. > This > > has turned out very well. > > It's a very good idea for production code, but I am not sure I > understand it's use for test code. Doesn't that induce problems when new > tests are included which change the running order of the tests or when > only one test is run ? No. The seed is constant. This means that the test gets the same results no matter what. Moreover, since the generator is obtained in the same way, and it is the utility method that checks to see if a test is being run, exactly the same production code paths are exercised in production and test mode. > In these cases the current state for the > generator will not be the same in each situation. Do tests reseed the > generator when they start ? > The utility returns a consistently seeded generator if running a test. The code using the generator just asks the utility class for a generator and doesn't know if it is seeded for a test or not.
