public void WritesEmptyStrictGraph()
{
IStringWriter writer = new StringWriterAdapter();
GraphVizWriter g = new GraphVizWriter(writer, Mock.Of <IDotHelper>());
g.StartGraph(GraphMode.Graph, strict: true);
g.EndGraph();
string result = writer.GetStringBuilder().ToString().Trim();
string expected = "strict graph \"\" {" + Environment.NewLine + "}";
Assert.Equal(expected, result);
}