[fix]칵테일 다건조회 무한스크롤 버그 수정 (#268)

* fix : bugs of testCase, init data

* fix : bug

* fix : parameter name

* fix: bug

Author: lkw9241

src/main/java/com/back/domain/cocktail/service/CocktailService.java

@@ -43,21 +43,23 @@ public List<CocktailSummaryResponseDto> getCocktails(Long lastValue, Long lastId
         Pageable pageable = PageRequest.of(0, fetchSize);
         List<Cocktail> cocktails;
 
+        Long cursor = (lastValue != null) ? lastValue : lastId;
+
         switch (sortBy != null ? sortBy.toLowerCase() : "") {
             case "keeps":
-                cocktails = (lastValue == null)
+                cocktails = (cursor == null)
                         ? cocktailRepository.findAllOrderByKeepCountDesc(pageable)
-                        : cocktailRepository.findByKeepCountLessThanOrderByKeepCountDesc(lastValue, lastId, pageable);
+                        : cocktailRepository.findByKeepCountLessThanOrderByKeepCountDesc(cursor, lastId, pageable);
                 break;
             case "comments":
-                cocktails = (lastValue == null)
+                cocktails = (cursor == null)
                         ? cocktailRepository.findAllOrderByCommentsCountDesc(pageable)
-                        : cocktailRepository.findByCommentsCountLessThanOrderByCommentsCountDesc(lastValue, lastId, pageable);
+                        : cocktailRepository.findByCommentsCountLessThanOrderByCommentsCountDesc(cursor, lastId, pageable);
                 break;
             default:
-                cocktails = (lastValue == null)
+                cocktails = (cursor == null)
                         ? cocktailRepository.findAllByOrderByIdDesc(pageable)
-                        : cocktailRepository.findByIdLessThanOrderByIdDesc(lastValue, pageable);
+                        : cocktailRepository.findByIdLessThanOrderByIdDesc(cursor, pageable);
                 break;
         }