test: 연결 리스트 기반 큐 테스트 코드 작성

Author: ksundong

yoonexample/src/test/java/queue/QueueTest.java

@@ -78,4 +78,74 @@ class QueueTest {
     assertThat(queue.isEmpty()).isTrue();
     assertThat(queue.size()).isEqualTo(0);
   }
+
+  @Test
+  @DisplayName("연결_리스트_기반_큐_생성_테스트")
+  void 연결_리스트_기반_큐_생성_테스트() {
+    Queue<Integer> queue = new LinkedListQueue<>();
+
+    assertThat(queue).isNotNull();
+    assertThat(queue.isEmpty()).isTrue();
+    assertThat(queue.size()).isEqualTo(0);
+  }
+
+  @Test
+  @DisplayName("연결_리스트_기반_큐_생성_테스트")
+  void 연결_리스트_기반_큐_EmptyQueueException_테스트() {
+    Queue<Integer> queue = new LinkedListQueue<>();
+
+    assertThat(queue).isNotNull();
+    assertThat(queue.isEmpty()).isTrue();
+    assertThat(queue.size()).isEqualTo(0);
+    assertThatThrownBy(queue::dequeue).isInstanceOf(EmptyQueueException.class);
+    assertThatThrownBy(queue::peek).isInstanceOf(EmptyQueueException.class);
+  }
+
+  @Test
+  @DisplayName("연결_리스트_기반_큐_데이터_저장_테스트")
+  void 연결_리스트_기반_큐_데이터_저장_테스트() {
+    Queue<Integer> queue = new LinkedListQueue<>();
+
+    queue.enqueue(1);
+    queue.enqueue(2);
+    queue.enqueue(3);
+    queue.enqueue(4);
+    queue.enqueue(5);
+
+    assertThat(queue).isNotNull();
+    assertThat(queue.isEmpty()).isFalse();
+    assertThat(queue.size()).isEqualTo(5);
+  }
+
+  @Test
+  @DisplayName("연결_리스트_기반_큐_데이터_저장_후_제거_테스트")
+  void 연결_리스트_기반_큐_데이터_저장_후_제거_테스트() {
+    Queue<Integer> queue = new LinkedListQueue<>();
+
+    queue.enqueue(1);
+    queue.enqueue(2);
+    queue.enqueue(3);
+    queue.enqueue(4);
+    queue.enqueue(5);
+
+    assertThat(queue).isNotNull();
+    assertThat(queue.isEmpty()).isFalse();
+    assertThat(queue.size()).isEqualTo(5);
+    assertThat(queue.peek()).isEqualTo(1);
+    assertThat(queue.dequeue()).isEqualTo(1);
+    assertThat(queue.size()).isEqualTo(4);
+    assertThat(queue.peek()).isEqualTo(2);
+    assertThat(queue.dequeue()).isEqualTo(2);
+    assertThat(queue.size()).isEqualTo(3);
+    assertThat(queue.peek()).isEqualTo(3);
+    assertThat(queue.dequeue()).isEqualTo(3);
+    assertThat(queue.size()).isEqualTo(2);
+    assertThat(queue.peek()).isEqualTo(4);
+    assertThat(queue.dequeue()).isEqualTo(4);
+    assertThat(queue.size()).isEqualTo(1);
+    assertThat(queue.peek()).isEqualTo(5);
+    assertThat(queue.dequeue()).isEqualTo(5);
+    assertThat(queue.isEmpty()).isTrue();
+    assertThat(queue.size()).isEqualTo(0);
+  }
 }