public void Test_ChangeGraphType()
{
GraphVizProcessor gvp = new GraphVizProcessor();
gvp.graph = new Graph(GraphType.Digraph, new Stmt_list());
gvp.AddEdge("a", "b");
if (!gvp.graph.ToCode().Contains("->"))
{
Assert.Fail("Edge type is not equal to grapf type before change.");
}
gvp.ChangeGraphType(GraphType.Graph);
if (!gvp.graph.ToCode().Contains("--"))
{
Assert.Fail("Edge type is not equal to graph type after change.");
}
}