Merge branch 'issue_440' into issue_533

Author: d-kad

src/pygambit/game.pxi

@@ -19,6 +19,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 #
+from collections import deque
 import io
 import itertools
 import pathlib

src/pygambit/strategy.pxi

@@ -115,4 +115,4 @@ class Strategy:
         action: c_GameAction = self.strategy.deref().GetAction(resolved_infoset.infoset)
         if not action:
             return None
-        return Action.wrap(action)
+        return Action.wrap(action)

tests/test_reduced_strategic_forms.py

@@ -0,0 +1,18 @@
+import pygambit as gbt
+
+
+def test_build_images_of_nodes_in_outcomes():
+    """Generate images in outcome of the nodes of a simple centipede game with 4 terminal nodes
+    """
+    g = gbt.read_efg("tests/test_games/e02.efg")
+    z1, z2, z3, z4 = g.outcomes
+    expected_images = {
+        g.root: {z1, z2, z3, z4},
+        g.root.children[0]: {z1},
+        g.root.children[1]: {z2, z3, z4},
+        g.root.children[1].children[0]: {z2},
+        g.root.children[1].children[1]: {z3, z4},
+        g.root.children[1].children[1].children[0]: {z3},
+        g.root.children[1].children[1].children[1]: {z4}
+    }
+    assert expected_images == g.compute_images()