Can't you both be right? Another facet: unit tests are the living, useful documentation of the code. Starting on a team with a large legacy code base, unit test

Can't you both be right? Another facet: unit tests are the living, useful documentation of the code. Starting on a team with a large legacy code base, unit tests are the tutorial on the best practices of the API. This magnified if the "unit" tests include full functional test with an embeddable container (eg. OpenEJB). (apologies for parroting the gp)