public void GetLevel_NullNode_ArgumentNullExceptionThrown()
{
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetLevel' throws an 'ArgumentNullException' when the node is null.
Assert.Throws <ArgumentNullException>("node", () => walker.GetLevel(null, 0).ToArray());
}
public void GetLevel_NegativeDepth_ArgumentExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetLevel' throws an 'ArgumentNullException' when the node is null.
Assert.Throws <ArgumentException>("depth", () => walker.GetLevel(tree, -1).ToArray());
}
public void GetLevel_NullWalker_ArgumentNullExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a null ITreeWalker.
NodeWalker <int> walker = null;
// Assert that 'GetLevel' throws an 'ArgumentNullException' when the tree walker
// is null.
Assert.Throws <ArgumentNullException>("walker", () => walker.GetLevel(tree, 0).ToArray());
}
public void GetLevel()
{
// 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 that 'GetLevel' returns the correct elements.
Assert.Equal(
new int[] { 0 },
walker.GetLevel(tree, 0).Select(x => x.Value));
Assert.Equal(
new int[] { 1, 4 },
walker.GetLevel(tree, 1).Select(x => x.Value));
Assert.Equal(
new int[] { 2, 3, 5 },
walker.GetLevel(tree, 2).Select(x => x.Value));
Assert.Equal(
new int[] { 6 },
walker.GetLevel(tree, 3).Select(x => x.Value));
}