### December 2010 ###

### Question 2 ###

import unittest
from list_to_lower import list_to_lower, BadTypeException

class TestListToLower(unittest.TestCase):

    def setUp(self):
        ''' Set up an empty list. '''

        self.my_list = []

    def tearDown(self):
        ''' Clean up.'''

        self.my_list = None

    def testListToLowerEmptyList(self):
        ''' Test list_to_lower on an empty list. '''

        assert list_to_lower(self.my_list) == []

    def testListToLowerTypicalList(self):
        ''' Test list_to_lower on a typical list of strings with mixed cases. '''

        self.my_list = ['Ab', 'aB', 'aabBb']
        assert list_to_lower(self.my_list) == ['ab', 'ab', 'aabbb']

    def testListToLowerBadTypes(self):
        ''' Test list_to_lower on a list that contains bad types (i.e. an int).
        '''

        self.my_list = ['a', 3]
        try:
            list_to_lower(self.my_list)
        except BadTypeException, error:
            assert error.message == 'Non-string object found.'
        except:
            assert False

if __name__ == '__main__':

    suite = unittest.TestLoader().loadTestsFromTestCase(TestListToLower)
    unittest.TextTestRunner(verbosity=2).run(suite)