public void GetChildAt_NullNode_ThrowsArgumentNullException()
{
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
Assert.Throws <ArgumentNullException>("node", () => walker.GetChildAt((Node <int>)null, 0));
Assert.Throws <ArgumentNullException>("nodes", () => walker.GetChildAt((Node <int>[])null, 0).ToArray());
}
public void GetChildAt_IndexLessThanZero_ThrowArgumentOutOfRangeException()
{
// 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 <ArgumentOutOfRangeException>("index", () => walker.GetChildAt(tree, -1));
Assert.Throws <ArgumentOutOfRangeException>("index", () => walker.GetChildAt(EnumerableEx.Return(tree), -1).ToArray());
}
public void GetChildAt_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.GetChildAt(tree, 0));
Assert.Throws <ArgumentNullException>("walker", () => walker.GetChildAt(EnumerableEx.Return(tree), 0).ToArray());
}
public void GetChildAt_ValidIndex_ReturnsNode()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert.
Assert.Equal(1, walker.GetChildAt(tree, 0).Value);
Assert.Equal(
EnumerableEx.Return(1),
walker.GetChildAt(EnumerableEx.Return(tree), 0).Select(x => x.Value));
}
public void GetChildAt_InvalidIndex_ThrowsArgumentOutOfRangeException()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert.
Assert.Throws <ArgumentOutOfRangeException>("index", () => walker.GetChildAt(tree, 1));
}
public void GetChildAt_OfEnumerable_InvalidIndex_ReturnsEmptyArray()
{
// Get a valid tree.
var tree =
Node.Create(0).AddChildren(
Node.Create(1));
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert.
Assert.Equal(
Enumerable.Empty <Node <int> >(),
walker.GetChildAt(EnumerableEx.Return(tree), 1).ToArray());
}
public void GetLeaves(int[] testPath, int[] expected)
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Get a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
var node = tree;
foreach (int i in testPath)
{
node = walker.GetChildAt(node, i);
}
Assert.Equal(
expected,
walker.GetLeaves(node).Select(x => x.Value));
}
