public void Test_GetDepthFirstEnumerator()
{
GraphNode<string> rootGraphNode = new GraphNode<string>("root");
GraphNode<string> leftParentGraphNode = new GraphNode<string>("leftParent");
GraphNode<string> leftFirstChildGraphNode = new GraphNode<string>("leftFirstChild");
GraphNode<string> leftSecondChildGraphNode = new GraphNode<string>("leftSecondChild");
GraphNode<string> rightParentGraphNode = new GraphNode<string>("rightParent");
GraphNode<string> rightChildGraphNode = new GraphNode<string>("rightChild");
GraphNode<string> rightGrandChildGraphNode = new GraphNode<string>("rightGrandChild");
rootGraphNode.AddChild(leftParentGraphNode);
leftParentGraphNode.AddChild(leftFirstChildGraphNode);
leftParentGraphNode.AddChild(leftSecondChildGraphNode);
rootGraphNode.AddChild(rightParentGraphNode);
rightParentGraphNode.AddChild(rightChildGraphNode);
rightChildGraphNode.AddChild(rightGrandChildGraphNode);
GraphNode<string>[] expected = new[]
{
rootGraphNode,
leftParentGraphNode,
leftFirstChildGraphNode,
leftSecondChildGraphNode,
rightParentGraphNode,
rightChildGraphNode,
rightGrandChildGraphNode
};
Assert.That(expected.Zip(rootGraphNode.GetDepthFirstEnumerator(), (x, y) => x.Equals(y)).All(x => x), Is.True);
}