public void GetDescendantsShouldReturnAllDescendants()
{
// Arrange
// a+bc*
var charNodeA = new CharacterNode('a');
var charNodeB = new CharacterNode('b');
var charNodeC = new CharacterNode('c');
var quantifierPlus = new QuantifierPlusNode(charNodeA);
var quantifierStar = new QuantifierStarNode(charNodeC);
var grandchildren = new List <RegexNode> {
quantifierPlus, charNodeB, quantifierStar
};
var concatenationNode = new ConcatenationNode(grandchildren);
var target = new TestRegexNode(concatenationNode);
// Act
IEnumerable <RegexNode> result = target.GetDescendantNodes();
// Assert
result.Count().ShouldBe(6);
result.First().ShouldBe(charNodeA);
result.ElementAt(1).ShouldBe(quantifierPlus);
result.ElementAt(2).ShouldBe(charNodeB);
result.ElementAt(3).ShouldBe(charNodeC);
result.ElementAt(4).ShouldBe(quantifierStar);
result.Last().ShouldBe(concatenationNode);
}
public void GetDescendantsOnNodeWithNoChildrenShouldReturnEmptyIEnumerable()
{
// Arrange
var target = new TestRegexNode();
// Act
IEnumerable <RegexNode> result = target.GetDescendantNodes();
// Assert
result.ShouldBeEmpty();
}
