1 files changed, 140 insertions, 0 deletions
diff --git a/python/altgraph/altgraph_tests/test_graphutil.py b/python/altgraph/altgraph_tests/test_graphutil.py
new file mode 100644
index 0000000000..c1166237c1
--- /dev/null
+++ b/python/altgraph/altgraph_tests/test_graphutil.py
@@ -0,0 +1,140 @@
+import unittest
+from altgraph import GraphUtil
+from altgraph import Graph, GraphError
+
+class TestGraphUtil (unittest.TestCase):
+
+    def test_generate_random(self):
+        g =  GraphUtil.generate_random_graph(10, 50)
+        self.assertEqual(g.number_of_nodes(), 10)
+        self.assertEqual(g.number_of_edges(), 50)
+
+        seen = set()
+
+        for e in g.edge_list():
+            h, t = g.edge_by_id(e)
+            self.assertFalse(h == t)
+            self.assertTrue((h, t) not in seen)
+            seen.add((h, t))
+
+        g =  GraphUtil.generate_random_graph(5, 30, multi_edges=True)
+        self.assertEqual(g.number_of_nodes(), 5)
+        self.assertEqual(g.number_of_edges(), 30)
+
+        seen = set()
+
+        for e in g.edge_list():
+            h, t = g.edge_by_id(e)
+            self.assertFalse(h == t)
+            if (h, t) in seen:
+                break
+            seen.add((h, t))
+
+        else:
+            self.fail("no duplicates?")
+
+        g =  GraphUtil.generate_random_graph(5, 21, self_loops=True)
+        self.assertEqual(g.number_of_nodes(), 5)
+        self.assertEqual(g.number_of_edges(), 21)
+
+        seen = set()
+
+        for e in g.edge_list():
+            h, t = g.edge_by_id(e)
+            self.assertFalse((h, t) in seen)
+            if h == t:
+                break
+            seen.add((h, t))
+
+        else:
+            self.fail("no self loops?")
+
+        self.assertRaises(GraphError, GraphUtil.generate_random_graph, 5, 21)
+        g = GraphUtil.generate_random_graph(5, 21, True)
+        self.assertRaises(GraphError, GraphUtil.generate_random_graph, 5, 26, True)
+
+    def test_generate_scale_free(self):
+        graph = GraphUtil.generate_scale_free_graph(50, 10)
+        self.assertEqual(graph.number_of_nodes(), 500)
+
+        counts = {}
+        for node in graph:
+            degree = graph.inc_degree(node)
+            try:
+                counts[degree] += 1
+            except KeyError:
+                counts[degree] = 1
+
+        total_counts = sum(counts.values())
+        P = {}
+        for degree, count in counts.items():
+            P[degree] = count * 1.0 / total_counts
+
+        # XXX: use algoritm <http://stackoverflow.com/questions/3433486/how-to-do-exponential-and-logarithmic-curve-fitting-in-python-i-found-only-polyn>
+        # to check if P[degree] ~ degree ** G (for some G)
+
+        #print sorted(P.items())
+
+        #print sorted([(count, degree) for degree, count in counts.items()])
+
+        #self.fail("missing tests for GraphUtil.generate_scale_free_graph")
+
+    def test_filter_stack(self):
+        g = Graph.Graph()
+        g.add_node("1", "N.1")
+        g.add_node("1.1", "N.1.1")
+        g.add_node("1.1.1", "N.1.1.1")
+        g.add_node("1.1.2", "N.1.1.2")
+        g.add_node("1.1.3", "N.1.1.3")
+        g.add_node("1.1.1.1", "N.1.1.1.1")
+        g.add_node("1.1.1.2", "N.1.1.1.2")
+        g.add_node("1.1.2.1", "N.1.1.2.1")
+        g.add_node("1.1.2.2", "N.1.1.2.2")
+        g.add_node("1.1.2.3", "N.1.1.2.3")
+        g.add_node("2", "N.2")
+
+        g.add_edge("1", "1.1")
+        g.add_edge("1.1", "1.1.1")
+        g.add_edge("1.1", "1.1.2")
+        g.add_edge("1.1", "1.1.3")
+        g.add_edge("1.1.1", "1.1.1.1")
+        g.add_edge("1.1.1", "1.1.1.2")
+        g.add_edge("1.1.2", "1.1.2.1")
+        g.add_edge("1.1.2", "1.1.2.2")
+        g.add_edge("1.1.2", "1.1.2.3")
+
+        v, r, o =  GraphUtil.filter_stack(g, "1", [
+            lambda n: n != "N.1.1.1", lambda n: n != "N.1.1.2.3" ])
+
+        self.assertEqual(v,
+            set(["1", "1.1", "1.1.1", "1.1.2", "1.1.3",
+                "1.1.1.1", "1.1.1.2", "1.1.2.1", "1.1.2.2",
+                "1.1.2.3"]))
+        self.assertEqual(r, set([
+                "1.1.1", "1.1.2.3"]))
+
+        o.sort()
+        self.assertEqual(o,
+            [
+                ("1.1", "1.1.1.1"),
+                ("1.1", "1.1.1.2")
+            ])
+
+        v, r, o =  GraphUtil.filter_stack(g, "1", [
+            lambda n: n != "N.1.1.1", lambda n: n != "N.1.1.1.2" ])
+
+        self.assertEqual(v,
+            set(["1", "1.1", "1.1.1", "1.1.2", "1.1.3",
+                "1.1.1.1", "1.1.1.2", "1.1.2.1", "1.1.2.2",
+                "1.1.2.3"]))
+        self.assertEqual(r, set([
+                "1.1.1", "1.1.1.2"]))
+
+        self.assertEqual(o,
+            [
+                ("1.1", "1.1.1.1"),
+            ])
+
+
+if __name__ == "__main__": # pragma: no cover
+    unittest.main()