cleaned up nodal_roles, added tests

Author: mb3152

brainx/tests/test_nodal_roles.py

@@ -0,0 +1,13 @@
+#test nodal roles 
+import unittest
+import networkx as nx
+from .. import nodal_roles as nr
+from .. import weighted_modularity as wm
+
+class TestNodalRoles(unittest.TestCase):
+	def test_participation_coefficient(self):
+		graph = nx.Graph()
+		graph.add_node(1)
+		partition = wm.WeightedPartition(graph)
+		with self.assertRaises(ValueError):
+			nr.participation_coefficient(partition)