test_tennis.py

import unittest

from tennis import tennis_score

test_case_data = \
{   "even_scores" :                     [("Love-All", 0, 0),
                                         ("Fifteen-All", 1, 1),
                                         ("Thirty-All", 2, 2),
                                        ],
    "early_games_with_uneven_scores" :  [("Love-Fifteen", 0, 1),
                                         ("Fifteen-Love", 1, 0),
                                         ("Thirty-Fifteen", 2, 1),
                                         ("Forty-Thirty", 3, 2), 
                                        ],
    "endgame_with_uneven_scores":       [("Advantage Player 1" 4, 3),
                                         ("Advantage Player 2" 5, 6),
                                         ("Advantage Player 1" 13, 12),
                                        ],

    "there_is_a_winner":                [("Win for Player 1", 4, 0),
                                         ("Win for Player 2", 2, 4),
                                         ("Win for Player 1", 6, 4), 
                                        ], 
}    


def tennis_test_template(*args):
    def foo(self):
        self.assert_tennis_score(*args)
    return foo

class TennisTest(unittest.TestCase):

    def assert_tennis_score(self, expected_score, player1_points, player2_points):
        self.assertEqual(expected_score, tennis_score(player1_points, player2_points))

for behaviour, test_cases in test_case_data.items():
    for tennis_test_case_data in test_cases:
        expected_output, player1_score, player2_score = tennis_test_case_data
        test_name = "test_{0}_{1}_{2}".format(behaviour, player1_score, player2_score)
        tennis_test_case = tennis_test_template(*tennis_test_case_data)
        setattr(TennisTest, test_name, tennis_test_case)