Adding test for alternator

Author: drvinceknight

axelrod/tests/test_alternator.py

@@ -0,0 +1,32 @@
+"""
+Test for the alternator strategy
+"""
+import unittest
+import axelrod
+
+class TestAlternator(unittest.TestCase):
+
+    def test_initial_strategy(self):
+        """
+        Starts by cooperating
+        """
+        P1 = axelrod.Alternator()
+        P2 = axelrod.Player()
+        self.assertEqual(P1.strategy(P2), 'C')
+
+    def test_effect_of_strategy(self):
+        """
+        Simply does the opposite to what the strategy did last time
+        """
+        P1 = axelrod.Alternator()
+        P2 = axelrod.Player()
+        P1.history = ['C', 'D', 'D', 'D']
+        P2.history = ['C', 'C', 'C', 'C']
+        self.assertEqual(P1.strategy(P2), 'C')
+        P1.history = ['C', 'C', 'D', 'D', 'C']
+        P2.history = ['C', 'D', 'C', 'C', 'C']
+        self.assertEqual(P1.strategy(P2), 'D')
+
+    def test_representation(self):
+        P1 = axelrod.Alternator()
+        self.assertEqual(str(P1), 'Alternator')