public void GetRoot_NullNode_ArgumentNullExceptionThrown()
{
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetRoot' throws an 'ArgumentNullException' when the node is null.
Assert.Throws <ArgumentNullException>("node", () => walker.GetRoot(null));
}
public void GetRoot_NullWalker_ArgumentNullExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a null ITreeWalker.
NodeWalker <int> walker = null;
// Assert that 'GetRoot' throws an 'ArgumentNullException' when the tree walker
// is null.
Assert.Throws <ArgumentNullException>("walker", () => walker.GetRoot(tree));
}
public void GetRoot()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// For each node in the tree assert the 'GetRoot' returns the root of the tree.
foreach (Node <int> node in walker.PreOrderTraversal(tree))
{
Assert.Equal(tree.Value, walker.GetRoot(node).Value);
}
}