public void TryGetParent_NullNode_ThrowsArgumentNullException()
{
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
Node <int> parent = null;
Assert.Throws <ArgumentNullException>("node", () => walker.TryGetParent(null, out parent));
}
public void TryGetParent_NullTreeWalker_ThrowsArgumentNullException()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a null ITreeWalker.
NodeWalker <int> walker = null;
Node <int> parent = null;
Assert.Throws <ArgumentNullException>("walker", () => walker.TryGetParent(tree, out parent));
}
public void TryGetParent_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>();
Node <int> parent = null;
bool result = walker.TryGetParent(tree, out parent);
Assert.False(result);
Assert.Null(parent);
}
public void TryGetParent_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 = null;
bool result = walker.TryGetParent(tree.Children[0], out parent);
Assert.True(result);
Assert.Equal(0, parent.Value);
}