Used to illustrate finding test points

InMemoryDirectory.java

public class InMemoryDirectory {
    private final List<Element> elements;

    public InMemoryDirectory() {
        this.elements = new ArrayList<>();
    }

    public void addElement(Element newElement) {
        this.elements.add(newElement);
    }

    public void generateIndex() {
        Element index = new Element("index");
        for (Element element : elements) {
            index.addText(element.getName() + "\n");
        }
        this.addElement(index);
    }

    public int getElementCount() {
        return this.elements.size();
    }

    public Element getElement(String name) {
        for (Element element : elements) {
            if (element.getName().equals(name)) {
                return element;
            }
        }
        return null;
    }
}