add test

Author: peterbaumert

tests/test_models.py

@@ -111,6 +111,11 @@ def test_get_graph(self, fixturedir):
         print(str(graph))
         assert set(str(graph).splitlines()) == set(expected_graph)
 
+    def test_change_graph_direction(self, fixturedir):
+        workflows.SimpleWorkflow.rankdir = "TD"
+        graph = workflows.SimpleWorkflow.get_graph()
+        assert isinstance(graph, Digraph)
+
     def test_get_graph_svg(self, fixturedir):
         svg = workflows.SimpleWorkflow.get_graph_svg()
         assert isinstance(svg, SafeString)