diff --git a/planning.py b/planning.py
index 4bfa1d71a..a17677460 100644
--- a/planning.py
+++ b/planning.py
@@ -405,8 +405,8 @@ def __init__(self, pdll, negkb):
self.levels = [Level(pdll.kb, negkb)]
self.objects = set(arg for clause in pdll.kb.clauses + negkb.clauses for arg in clause.args)
- def __call__():
- expand_graph()
+ def __call__(self):
+ self.expand_graph()
def expand_graph(self):
last_level = self.levels[-1]
diff --git a/tests/test_planning.py b/tests/test_planning.py
index 3567ab445..4e012b207 100644
--- a/tests/test_planning.py
+++ b/tests/test_planning.py
@@ -69,3 +69,13 @@ def test_have_cake_and_eat_cake_too():
p.act(action)
assert p.goal_test()
+
+def test_graph_call():
+ pdll = spare_tire()
+ negkb = FolKB([expr('At(Flat, Trunk)')])
+ graph = Graph(pdll, negkb)
+
+ levels_size = len(graph.levels)
+ graph()
+
+ assert levels_size == len(graph.levels) - 1
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