Add comment and another test that invokes multiprocessing

Author: marcharper

src/axelrod_fortran/player.py

@@ -114,6 +114,10 @@ def strategy(self, opponent):
         return actions[original_action]
 
     def _release_shared_library(self):
+        # While this looks like we're checking that the shared library file
+        # isn't deleted, the exception is actually thrown in the manager
+        # thread closes before the player class is garbage collected, which
+        # tends to happen at the end of a script.
         try:
             shared_library_manager.release(self.original_name, self.index)
         except FileNotFoundError:

tests/test_player.py

@@ -1,11 +1,12 @@
 from ctypes import c_int, c_float, POINTER, CDLL
 import itertools
+import random
 
 import pytest
 
 from axelrod_fortran import Player, characteristics, all_strategies
 from axelrod import (Alternator, Cooperator, Defector, Match, MoranProcess,
-                     Game, basic_strategies, seed)
+                     Game, basic_strategies, seed, Tournament)
 from axelrod.action import Action
 
 
@@ -180,8 +181,17 @@ def test_no_warning_for_normal_interaction(recwarn):
 
 
 def test_multiple_copies(recwarn):
+    """Test that multiple copies of a strategy doesn't cause any errors."""
     players = [Player('ktitfortatc') for _ in range(5)] + [
         Player('k42r') for _ in range(5)]
     mp = MoranProcess(players)
     mp.play()
-    mp.populations_plot()
+    assert len(recwarn) == 0
+
+
+def test_small_tournament(recwarn):
+    players = [Player(name) for name in all_strategies]
+    players = random.sample(players, 20)
+    tournament = Tournament(players, repetitions=1)
+    results = tournament.play(processes=2)
+    assert len(recwarn) == 0