'For convenience, we can pass a single preprocessor instance'

def test_preprocessors_can_be_passed_in_as_non_iterable(self):

    pp = Discretize()
    learner = DummyLearnerPP(preprocessors=pp)
    self.assertEqual(tuple(learner.active_preprocessors), (pp,), 'Preprocessors    should    be    able    to    be    passed    in    as    single    object    as    well    as    an    iterable    object')
