@Test
public void testSize() {
SPSCQueue<Integer> q = new SPSCQueue<>(100);
for (int i = 0; i < q.actualCapacity(); i++) {
assertTrue(q.add(i));
assertEquals(i + 1, q.size());
}
}
@Test
public void testPoll() {
SPSCQueue<Integer> q = new SPSCQueue<>(100);
for (int i = 0; i < q.actualCapacity(); i++) {
q.add(i);
}
for (int i = 0; i < 100; i++) {
assertEquals(i, (int) q.poll());
}
}
@Test
public void testPeek() {
SPSCQueue<Integer> q = new SPSCQueue<>(100);
assertNull(q.peek());
for (int i = 0; i < q.actualCapacity(); i++) {
q.add(i);
}
for (int i = 0; i < q.actualCapacity(); i++) {
assertEquals(i, (int) q.peek());
q.remove();
}
}
@Test
public void testElement() {
SPSCQueue<Integer> q = new SPSCQueue<>(100);
try {
q.element();
fail("element() on an empty queue");
} catch (NoSuchElementException ex) {
// expected
}
for (int i = 0; i < q.actualCapacity(); i++) {
q.add(i);
}
for (int i = 0; i < q.actualCapacity(); i++) {
assertEquals(i, (int) q.element());
q.remove();
}
}
@Test
public void testRemove() {
SPSCQueue<Integer> q = new SPSCQueue<>(100);
for (int i = 0; i < q.actualCapacity(); i++) {
q.add(i);
}
for (int i = 0; i < q.actualCapacity(); i++) {
assertEquals(i, (int) q.remove());
}
try {
q.remove();
fail("removed item from an empty queue");
} catch (NoSuchElementException ex) {
// expected
}
assertEquals(0, q.size());
}
@Test
public void testAdd() {
SPSCQueue<Integer> q = new SPSCQueue<>(100);
for (int i = 0; i < q.actualCapacity(); i++) {
assertTrue(q.add(i));
}
try {
q.add(123);
fail("more items than allowed added");
} catch (IllegalStateException ex) {
// expected
}
assertEquals(q.actualCapacity(), q.size());
}
