/**
* Verfiy that our remove method correctly removes the elements with the highest priority,
* decrements the size, and correctly sorts the elements
*/
public void testRemove() {
A.add("A");
A.add("C");
A.add("E");
A.add("A");
A.add("U");
A.add("B");
A.add("Z");
assertEquals(A.size(), 7);
assertEquals(A.peek(), "Z");
assertEquals(A.remove(), "Z");
assertEquals(A.size(), 6);
assertEquals(A.peek(), "U");
assertEquals(A.remove(), "U");
assertEquals(A.size(), 5);
assertEquals(A.peek(), "E");
assertEquals(A.remove(), "E");
assertEquals(A.size(), 4);
assertEquals(A.peek(), "C");
assertEquals(A.remove(), "C");
assertEquals(A.size(), 3);
assertEquals(A.peek(), "B");
assertEquals(A.remove(), "B");
assertEquals(A.size(), 2);
assertEquals(A.peek(), "A");
assertEquals(A.remove(), "A");
assertEquals(A.size(), 1);
assertEquals(A.peek(), "A");
assertEquals(A.remove(), "A");
assertEquals(A.size(), 0);
assertEquals(A.peek(), null);
assertEquals(A.remove(), null);
}
/**
* Verify that the add method adds the specified elements and increase the size accordingly,
* Moreover, make sure that the elements are sorted correctly according to their priority in this
* PQueue. Furthermore, we check that the add method throw NullPointerException if we add a null
* element
*/
public void testAdd() {
A.add("A");
assertFalse(A.isEmpty());
assertEquals(A.peek(), "A");
assertTrue(A.size() == 1);
A.add("D");
assertTrue(A.size() == 2);
assertEquals(A.peek(), "D");
A.add("E");
assertTrue(A.size() == 3);
assertEquals(A.peek(), "E");
A.add("C");
assertTrue(A.size() == 4);
assertEquals(A.peek(), "E");
A.add("F");
assertTrue(A.size() == 5);
assertEquals(A.peek(), "F");
A.add("F");
assertTrue(A.size() == 6);
assertEquals(A.peek(), "F");
try {
A.add(null);
fail("should throw NullPointerException()");
} catch (NullPointerException e) {
assertTrue(true);
}
}
/** Verify that the size() method correctly returns the number of elements in this PQueue */
public void testSize() {
assertTrue(A.size() == 0);
A.add("A");
assertTrue(A.size() == 1);
A.add("B");
A.remove();
assertTrue(A.size() == 1);
A.add("B");
A.add("C");
assertTrue(A.size() == 3);
A.add("E");
assertTrue(A.size() == 4);
A.add("F");
A.add("G");
assertTrue(A.size() == 6);
A.remove();
A.remove();
A.remove();
assertTrue(A.size() == 3);
A.remove();
assertTrue(A.size() == 2);
A.remove();
assertTrue(A.size() == 1);
A.remove();
assertTrue(A.size() == 0);
A.remove();
assertTrue(A.size() == 0);
}