public void MustHaveEdges()
{
typeof(DirectedGraph)
.Invoking(_ => DirectedGraph.Of(
null, GraphFactory.CreateNodes()))
.Should().Throw <ArgumentNullException>()
.Which.ParamName.Should().Be("edges");
}
public void MustNotHaveDuplicateNodes()
{
typeof(DirectedGraph)
.Invoking(_ => DirectedGraph.Of(
GraphFactory.CreateEdges(),
GraphFactory.CreateNodes("A", "A")))
.Should().Throw <ArgumentException>()
.Which.ParamName.Should().Be("nodes");
}
public void CannotChangeItsSetOfEdges()
{
var edges = GraphFactory.CreateEdges("A-B").ToList();
var nodes = GraphFactory.CreateNodes("A", "B");
var graph = DirectedGraph.Of(edges, nodes);
graph.EdgeCount.Should().Be(1);
edges.Add(GraphFactory.CreateEdge("B-A"));
graph.EdgeCount.Should().Be(1);
}
public void CannotChangeItsSetOfNodes()
{
var edges = GraphFactory.CreateEdges("A-B");
var nodes = GraphFactory.CreateNodes("A", "B").ToList();
var graph = DirectedGraph.Of(edges, nodes);
graph.Nodes.Should().HaveCount(2);
nodes.Add(GraphFactory.CreateNode("C"));
graph.Nodes.Should().HaveCount(2);
}
public void MayHaveDuplicateEdges()
{
var graph = typeof(DirectedGraph)
.Invoking(_ => DirectedGraph.Of(
GraphFactory.CreateEdges("A-B", "A-B"),
GraphFactory.CreateNodes("A", "B")))
.Should().NotThrow()
.Subject;
graph.EdgeCount.Should().Be(2);
}