public void CopyingCharacterNodeShouldCopyOriginalCharacter()
{
// Arrange
var target = new CharacterNode('a');
// Act
// RemoveNode returns a copy of the current node.
var result = target.RemoveNode(new CharacterNode('x'));
// Assert
CharacterNode characterNode = result.ShouldBeOfType <CharacterNode>();
characterNode.Character.ShouldBe(target.Character);
}