test: ArrayStack 테스트 코드 작성

Author: ksundong

yoonexample/src/test/java/stack/StackTest.java

@@ -0,0 +1,58 @@
+package stack;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+class StackTest {
+
+  @Test
+  @DisplayName("Array Stack의 생성 및 초기화")
+  void arrayStack의_생성_및_초기화() {
+    Stack<Integer> stack = new ArrayStack<>();
+
+    assertThat(stack).isNotNull();
+    assertThat(stack.isEmpty()).isTrue();
+    assertThat(stack.size()).isEqualTo(0);
+  }
+
+  @Test
+  @DisplayName("Array Stack에 데이터 5개 넣기")
+  void arrayStack에_데이터_5개_넣기() {
+    Stack<Integer> stack = new ArrayStack<>();
+
+    stack.push(1);
+    stack.push(2);
+    stack.push(3);
+    stack.push(4);
+    stack.push(5);
+
+    assertThat(stack).isNotNull();
+    assertThat(stack.isEmpty()).isFalse();
+    assertThat(stack.size()).isEqualTo(5);
+  }
+
+  @Test
+  @DisplayName("Array Stack에 데이터 5개 넣고 뺴기")
+  void arrayStack에_데이터_5개_넣고_빼기() {
+    Stack<Integer> stack = new ArrayStack<>();
+
+    stack.push(1);
+    stack.push(2);
+    stack.push(3);
+    stack.push(4);
+    stack.push(5);
+
+    assertThat(stack).isNotNull();
+    assertThat(stack.isEmpty()).isFalse();
+    assertThat(stack.size()).isEqualTo(5);
+    assertThat(stack.pop()).isEqualTo(5);
+    assertThat(stack.pop()).isEqualTo(4);
+    assertThat(stack.pop()).isEqualTo(3);
+    assertThat(stack.pop()).isEqualTo(2);
+    assertThat(stack.pop()).isEqualTo(1);
+    assertThat(stack.isEmpty()).isTrue();
+    assertThat(stack.size()).isEqualTo(0);
+  }
+}