Merge pull request #905 from Axelrod-Python/strategy-transformer-tests

Strategy transformer tests

axelrod/strategy_transformers.py

@@ -404,7 +404,7 @@ def joss_ann_wrapper(player, opponent, proposed_action, probability):
     action: an axelrod.Action, C or D
     """
     if sum(probability) > 1:
-        probability[:] = [i / sum(probability) for i in probability]
+        probability = tuple([i / sum(probability) for i in probability])
 
     remaining_probability = max(0, 1 - probability[0] - probability[1])
     probability += (remaining_probability,)

axelrod/tests/unit/test_strategy_transformers.py

@@ -145,6 +145,13 @@ def test_jossann_transformer(self):
             p1.play(p2)
         self.assertEqual(p1.history, [D, C, C, D, D])
 
+        probability = (0.6, 0.6)
+        p1 = JossAnnTransformer(probability)(axelrod.Cooperator)()
+        p2 = axelrod.Cooperator()
+        for _ in range(5):
+            p1.play(p2)
+        self.assertEqual(p1.history, [D, C, D, D, C])
+
     def test_noisy_transformer(self):
         """Tests that the noisy transformed does flip some moves."""
         random.seed(5)