public void GetChildrenByPredicate_NullNode_ArgumentNullExceptionThrown()
{
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetChildren' throws an 'ArgumentNullException' when the node is
// null.
Assert.Throws <ArgumentNullException>(
"nodes",
() => walker.GetChildren((IEnumerable <Node <int> >)null, (n) => true).ToArray());
Assert.Throws <ArgumentNullException>(
"node",
() => walker.GetChildren((Node <int>)null, (n) => true).ToArray());
}
public void GetChildrenByPredicate_NullPredicate_ArgumentNullExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetChildren' throws an 'ArgumentNullException' when the predicate
// is null.
Assert.Throws <ArgumentNullException>(
"predicate",
() => walker.GetChildren(new Node <int>[] { tree }, (Func <Node <int>, bool>)null).ToArray());
Assert.Throws <ArgumentNullException>(
"predicate",
() => walker.GetChildren(tree, (Func <Node <int>, bool>)null).ToArray());
}
public void GetChildrenByPredicate_NullWalker_ArgumentNullExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a null ITreeWalker.
NodeWalker <int> walker = null;
// Assert that 'GetChildren' throws an 'ArgumentNullException' when the tree
// walker is null.
Assert.Throws <ArgumentNullException>(
"walker",
() => walker.GetChildren(new Node <int>[] { tree }, (n) => true).ToArray());
Assert.Throws <ArgumentNullException>(
"walker",
() => walker.GetChildren(tree, (n) => true).ToArray());
}
public void GetChildrenByKey_NullNode_ArgumentNullExceptionThrown()
{
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetChildren' throws an 'ArgumentNullException' when the node is
// null.
Assert.Throws <ArgumentNullException>(
"nodes",
() => walker.GetChildren((IEnumerable <Node <int> >)null, default(Node <int>)).ToArray());
Assert.Throws <ArgumentNullException>(
"node",
() => walker.GetChildren((Node <int>)null, default(Node <int>)).ToArray());
Assert.Throws <ArgumentNullException>(
"nodes",
() => walker.GetChildren((IEnumerable <Node <int> >)null, default(Node <int>), EqualityComparer <Node <int> > .Default).ToArray());
Assert.Throws <ArgumentNullException>(
"node",
() => walker.GetChildren((Node <int>)null, default(Node <int>), EqualityComparer <Node <int> > .Default).ToArray());
}
public void GetChildrenByPredicate_PredicateTests()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Create test predicates and the expected results.
var testCases = new[]
{
new {
Predicate = new Func <Node <int>, bool>(i => i.Value % 2 == 0),
ExpectedResults = new int[] { 4 }
},
new {
Predicate = new Func <Node <int>, bool>(i => i.Value % 2 == 1),
ExpectedResults = new int[] { 1 }
},
new {
Predicate = new Func <Node <int>, bool>(i => i.Value >= 2),
ExpectedResults = new int[] { 4 }
},
};
// Assert that 'GetChildren' returns the expected results for each predicate.
foreach (var testCase in testCases)
{
Assert.Equal(
walker
.GetChildren(tree, testCase.Predicate)
.Select(x => x.Value),
testCase.ExpectedResults);
Assert.Equal(
walker
.GetChildren(new Node <int>[] { tree }, testCase.Predicate)
.Select(x => x.Value),
testCase.ExpectedResults);
}
}
public void GetChildrenByKey_NullKey_ArgumentNullExceptionThrown()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
// Assert that 'GetChildren' throws an 'ArgumentNullException' when the key
// is null.
Assert.Throws <ArgumentNullException>(
"key",
() => walker.GetChildren(new Node <int>[] { tree }, (Node <int>)null).ToArray());
Assert.Throws <ArgumentNullException>(
"key",
() => walker.GetChildren(tree, (Node <int>)null).ToArray());
Assert.Throws <ArgumentNullException>(
"key",
() => walker.GetChildren(new Node <int>[] { tree }, (Node <int>)null, EqualityComparer <Node <int> > .Default).ToArray());
Assert.Throws <ArgumentNullException>(
"key",
() => walker.GetChildren(tree, (Node <int>)null, EqualityComparer <Node <int> > .Default).ToArray());
}
public void GetChildrenByKey_ByKeyTests()
{
// Get a valid tree.
var tree = TestTreeFactory.GetSimpleTree();
// Create a valid ITreeWalker.
NodeWalker <int> walker = new NodeWalker <int>();
foreach (Node <int> node in walker.PreOrderTraversal(tree))
{
foreach (Node <int> key in walker.PreOrderTraversal(tree))
{
IEnumerable <Node <int> > result = walker.GetChildren(node, key).ToArray();
if (walker.GetChildren(node).Contains(key))
{
Assert.Equal(result, new Node <int>[] { key });
}
else
{
Assert.Empty(result);
}
}
}
}
