public void GetParent_NullNode_ThrowsArgumentNullException()
{
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
Assert.Throws <ArgumentNullException>("node", () => walker.GetParent(null));
}
public void GetParent_NullTreeWalker_ThrowsArgumentNullException()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a null ITreeWalker.
NodeWalker <int> walker = null;
Assert.Throws <ArgumentNullException>("walker", () => walker.GetParent(tree));
}
public void GetParent_NodeDoesNotHaveParent_ReturnsNull()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
Assert.Throws <InvalidOperationException>(() => walker.GetParent(tree));
}
public void GetParent_NodeHasParent_ReturnsNode()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
Node <int> parent = walker.GetParent(tree[0]);
Assert.Equal(0, parent.Value);
}