'Fitters have to be able to pass the `use_default_preprocessors` and
preprocessors down to individual learners'

def test_correctly_sets_preprocessors_on_learner(self):

    pp = Randomize()
    fitter = DummyFitter(preprocessors=pp)
    fitter.use_default_preprocessors = True
    learner = fitter.get_learner(Fitter.CLASSIFICATION)
    self.assertEqual(learner.use_default_preprocessors, True, 'Fitter    did    not    properly    pass    the    `use_default_preprocessors`attribute    to    its    learners')
    self.assertEqual(tuple(learner.active_preprocessors), (pp,), 'Fitter    did    not    properly    pass    its    preprocessors    to    its    learners')
