public void GetParentOrDefault_NullNode_ThrowsArgumentNullException() { // Get a valid ITreeWalker. NodeWalker <int> walker = new NodeWalker <int>(); Assert.Throws <ArgumentNullException>("node", () => walker.GetParentOrDefault(null)); }
public void GetParentOrDefault_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.GetParentOrDefault(tree)); }
public void GetParentOrDefault_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.Null(walker.GetParentOrDefault(tree)); }
public void GetParentOrDefault_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.GetParentOrDefault(tree[0]); Assert.Equal(0, parent.Value); }