Added a test for updating separated set

Author: zhi-yi-huang

tests/TestSkeletonDiscovery.py

@@ -0,0 +1,18 @@
+from unittest import TestCase
+import numpy as np
+from causallearn.search.ConstraintBased.PC import pc
+import networkx as nx
+from causallearn.utils.cit import chisq, fisherz, gsq, kci, mv_fisherz, d_separation
+
+
+class TestSkeletonDiscovery(TestCase):
+    def test_sepset(self):
+        truth_DAG_directed_edges = {(0, 2), (1, 2), (2, 3), (2, 4)}
+
+        true_dag_netx = nx.DiGraph()
+        true_dag_netx.add_nodes_from(list(range(5)))
+        true_dag_netx.add_edges_from(truth_DAG_directed_edges)
+
+        data = np.zeros((100, len(true_dag_netx.nodes)))  # just a placeholder
+        cg = pc(data, 0.05, d_separation, True, 0, -1, true_dag=true_dag_netx)
+        assert cg.sepset[0, 2] is None