public void GetPrecedingSiblings_NullNode_ArgumentNullExceptionThrown()
{
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetPrecedingSiblings' throws an 'ArgumentNullException' when the node is null.
Assert.Throws <ArgumentNullException>("node", () => walker.GetPrecedingSiblings(null).ToArray());
}
public void GetPrecedingSiblings_NullWalker_ArgumentNullExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a null ITreeWalker.
NodeWalker <int> walker = null;
// Assert that 'GetPrecedingSiblings' throws an 'ArgumentNullException' when the tree walker
// is null.
Assert.Throws <ArgumentNullException>("walker", () => walker.GetPrecedingSiblings(tree).ToArray());
}
public void GetPrecedingSiblings(int[] path, int[] expectedResult)
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
foreach (int i in path)
{
tree = tree[i];
}
// For each node in the tree assert that 'GetPrecedingSiblings' returns the correct
// elements.
Assert.Equal(
expectedResult,
walker.GetPrecedingSiblings(tree).Select(x => x.Value));
}
