Reference no: EM133234678

The following interface describes a dual-priority stack. In this dual-priority stack, all pushed high-priority items are popped before any low-priority items, and all items with the same priority are popped in a last-in-first-out (LIFO) order. The push method throws an exception on null or invalid input, so all objects in the queue will be non-null and will have a valid priority. The pop method returns null if the queue is empty.

public class DualPriorityStack {

public enum ItemPriority { High, Low };

public void push(T item, ItemPriority priority);

public T pop();

public boolean isEmpty();

}

Based on the class specification and description above, use the intuitive test generation process discussed in the week 3 lecture (i.e. not using coverage criteria) to create a JUnit test for the pop method. Write JUnit Java code, but don't worry too much about the exact Java or JUnit syntax, instead focus on the test logic.