// validating/tests/CircularQueueTest.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
package validating;
import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;

public class CircularQueueTest {
 private CircularQueue queue = new CircularQueue(10);
 private int i = 0;
 @BeforeEach
 public void initialize() {
 while(i < 5) // Pre-load with some data
 queue.put(Integer.toString(i++));
 }
 // Support methods:
 private void showFullness() {
 assertTrue(queue.full());
 assertFalse(queue.empty());
 System.out.println(queue.dump());
 }
 private void showEmptiness() {
 assertFalse(queue.full());
 assertTrue(queue.empty());
 System.out.println(queue.dump());
 }
 @Test
 public void full() {
 System.out.println("testFull");
 System.out.println(queue.dump());
 System.out.println(queue.get());
 System.out.println(queue.get());
 while(!queue.full())
 queue.put(Integer.toString(i++));
 String msg = "";
 try {
 queue.put("");
 } catch(CircularQueueException e) {
 msg = e.getMessage();
 System.out.println(msg);
 }
 assertEquals(msg, "put() into full CircularQueue");
 showFullness();
 }
 @Test
 public void empty() {
 System.out.println("testEmpty");
 while(!queue.empty())
 System.out.println(queue.get());
 String msg = "";
 try {
 queue.get();
 } catch(CircularQueueException e) {
 msg = e.getMessage();
 System.out.println(msg);
 }
 assertEquals(msg, "get() from empty CircularQueue");
 showEmptiness();
 }
 @Test
 public void nullPut() {
 System.out.println("testNullPut");
 String msg = "";
 try {
 queue.put(null);
 } catch(CircularQueueException e) {
 msg = e.getMessage();
 System.out.println(msg);
 }
 assertEquals(msg, "put() null item");
 }
 @Test
 public void circularity() {
 System.out.println("testCircularity");
 while(!queue.full())
 queue.put(Integer.toString(i++));
 showFullness();
 assertTrue(queue.isWrapped());
 while(!queue.empty())
 System.out.println(queue.get());
 showEmptiness();
 while(!queue.full())
 queue.put(Integer.toString(i++));
 showFullness();
 while(!queue.empty())
 System.out.println(queue.get());
 showEmptiness();
 }
}
/* Output:
testNullPut
put() null item
testCircularity
in = 0, out = 0, full() = true, empty() = false,
CircularQueue =
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
0
1
2
3
4
5
6
7
8
9
in = 0, out = 0, full() = false, empty() = true,
CircularQueue =
[null, null, null, null, null, null, null, null, null,
null]
in = 0, out = 0, full() = true, empty() = false,
CircularQueue =
[10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
10
11
12
13
14
15
16
17
18
19
in = 0, out = 0, full() = false, empty() = true,
CircularQueue =
[null, null, null, null, null, null, null, null, null,
null]
testFull
in = 5, out = 0, full() = false, empty() = false,
CircularQueue =
[0, 1, 2, 3, 4, null, null, null, null, null]
0
1
put() into full CircularQueue
in = 2, out = 2, full() = true, empty() = false,
CircularQueue =
[10, 11, 2, 3, 4, 5, 6, 7, 8, 9]
testEmpty
0
1
2
3
4
get() from empty CircularQueue
in = 5, out = 5, full() = false, empty() = true,
CircularQueue =
[null, null, null, null, null, null, null, null, null,
null]
*/