Java/src/test/java/com/examplehub/datastructures/queue/QueueTest.java at list · letscode-17/Java · GitHub

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package com.examplehub.datastructures.queue;

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.Test;

class QueueTest {

  @Test
  void testQueue() {
    Queue<String> queue = new Queue<>(5);
    assertTrue(queue.empty());
    assertEquals(0, queue.size());
    assertEquals("[]", queue.toString());

    for (int i = 1; i <= 5; ++i) {
      queue.enqueue(i + "");
    }
    assertEquals(5, queue.size());
    assertTrue(queue.full());
    assertEquals("[1, 2, 3, 4, 5]", queue.toString());

    assertEquals("1", queue.dequeue());
    assertEquals("2", queue.dequeue());
    assertEquals("[3, 4, 5]", queue.toString());

    assertEquals("1", queue.enqueue("1"));
    assertEquals("2", queue.enqueue("2"));
    assertEquals("3", queue.front());
    assertEquals("2", queue.rear());
    assertTrue(queue.full());
    assertEquals("[3, 4, 5, 1, 2]", queue.toString());

    assertEquals("3", queue.dequeue());
    assertEquals("4", queue.dequeue());

    queue.clear();
    assertEquals(queue.size(), 0);
    assertTrue(queue.empty());
    assertEquals("[]", queue.toString());
  }
}