slack(article): send message when article is fetched

Author: gracefulBrown

backend/src/main/resources/application-test.yml

@@ -43,3 +43,8 @@ application:
 
 manager:
   role: GUEST
+
+slack:
+  article:
+    token: token
+    channel: channel

backend/src/test/java/wooteco/prolog/article/application/ArticleServiceTest.java

@@ -47,6 +47,9 @@ class ArticleServiceTest {
     @Mock
     private MemberService memberService;
 
+    @Mock
+    private SlackService slackService;
+
     @InjectMocks
     private ArticleService articleService;