test: Deque 테스트 코드 작성

Author: ksundong

yoonexample/src/test/java/deque/DequeTest.java

@@ -0,0 +1,135 @@
+package deque;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+class DequeTest {
+
+  @Test
+  @DisplayName("덱의_생성_및_초기화_테스트")
+  void 덱의_생성_및_초기화_테스트() {
+    Deque<Integer> deque = new LinkedLIstDeque();
+
+    assertThat(deque).isNotNull();
+    assertThat(deque.size()).isEqualTo(0);
+    assertThat(deque.isEmpty()).isTrue();
+  }
+
+  @Test
+  @DisplayName("덱에_데이터_삽입_테스트")
+  void 덱에_데이터_삽입_테스트() {
+    Deque<Integer> deque = new LinkedLIstDeque();
+
+    deque.addFirst(3);
+    deque.addFirst(2);
+    deque.addFirst(1);
+    deque.addLast(4);
+    deque.addLast(5);
+    deque.addLast(6);
+
+    assertThat(deque).isNotNull();
+    assertThat(deque.size()).isEqualTo(6);
+    assertThat(deque.isEmpty()).isFalse();
+  }
+
+  @Test
+  @DisplayName("덱에_데이터_삽입_앞에서_삭제_테스트")
+  void 덱에_데이터_삽입_앞에서_삭제_테스트() {
+    Deque<Integer> deque = new LinkedLIstDeque();
+
+    deque.addFirst(3);
+    deque.addFirst(2);
+    deque.addFirst(1);
+    deque.addLast(4);
+    deque.addLast(5);
+    deque.addLast(6);
+
+    assertThat(deque).isNotNull();
+    assertThat(deque.size()).isEqualTo(6);
+    assertThat(deque.isEmpty()).isFalse();
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeFirst()).isEqualTo(1);
+    assertThat(deque.size()).isEqualTo(5);
+    assertThat(deque.getFirst()).isEqualTo(2);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeFirst()).isEqualTo(2);
+    assertThat(deque.size()).isEqualTo(4);
+    assertThat(deque.getFirst()).isEqualTo(3);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeFirst()).isEqualTo(3);
+    assertThat(deque.size()).isEqualTo(3);
+    assertThat(deque.getFirst()).isEqualTo(4);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeFirst()).isEqualTo(4);
+    assertThat(deque.size()).isEqualTo(2);
+    assertThat(deque.getFirst()).isEqualTo(5);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeFirst()).isEqualTo(5);
+    assertThat(deque.size()).isEqualTo(1);
+    assertThat(deque.getFirst()).isEqualTo(6);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeFirst()).isEqualTo(6);
+    assertThat(deque.size()).isEqualTo(0);
+    assertThat(deque.isEmpty()).isTrue();
+  }
+
+  @Test
+  @DisplayName("덱에_데이터_삽입_뒤에서_삭제_테스트")
+  void 덱에_데이터_삽입_뒤에서_삭제_테스트() {
+    Deque<Integer> deque = new LinkedLIstDeque();
+
+    deque.addFirst(3);
+    deque.addFirst(2);
+    deque.addFirst(1);
+    deque.addLast(4);
+    deque.addLast(5);
+    deque.addLast(6);
+
+    assertThat(deque).isNotNull();
+    assertThat(deque.size()).isEqualTo(6);
+    assertThat(deque.isEmpty()).isFalse();
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(6);
+    assertThat(deque.removeLast()).isEqualTo(6);
+    assertThat(deque.size()).isEqualTo(5);
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(5);
+    assertThat(deque.removeLast()).isEqualTo(5);
+    assertThat(deque.size()).isEqualTo(4);
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(4);
+    assertThat(deque.removeLast()).isEqualTo(4);
+    assertThat(deque.size()).isEqualTo(3);
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(3);
+    assertThat(deque.removeLast()).isEqualTo(3);
+    assertThat(deque.size()).isEqualTo(2);
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(2);
+    assertThat(deque.removeLast()).isEqualTo(2);
+    assertThat(deque.size()).isEqualTo(1);
+    assertThat(deque.getFirst()).isEqualTo(1);
+    assertThat(deque.getLast()).isEqualTo(1);
+    assertThat(deque.removeLast()).isEqualTo(1);
+    assertThat(deque.size()).isEqualTo(0);
+    assertThat(deque.isEmpty()).isTrue();
+  }
+
+  @Test
+  @DisplayName("덱이_비어있을_때_예외_처리_테스트")
+  void 덱이_비어있을_때_예외_처리_테스트() {
+    Deque<Integer> deque = new LinkedLIstDeque();
+
+    assertThat(deque).isNotNull();
+    assertThat(deque.size()).isEqualTo(0);
+    assertThat(deque.isEmpty()).isTrue();
+    assertThatThrownBy(deque::getFirst).isInstanceOf(EmptyDequeException.class);
+    assertThatThrownBy(deque::removeFirst).isInstanceOf(EmptyDequeException.class);
+    assertThatThrownBy(deque::getLast).isInstanceOf(EmptyDequeException.class);
+    assertThatThrownBy(deque::removeLast).isInstanceOf(EmptyDequeException.class);
+  }
+}