fix: 더미 Basket은 조회되지 않도록 수정

src/main/java/kr/allcll/seatfinder/basket/Basket.java

@@ -102,4 +102,12 @@ public Basket(Subject subject, String smtCd, String year, String curiNo, String
         this.rcnt = rcnt;
         this.totRcnt = totRcnt;
     }
+
+    public boolean isNotEmpty() {
+        return !isEmpty();
+    }
+
+    public boolean isEmpty() {
+        return this.rcnt == null || this.rcnt == 0;
+    }
 }

src/main/java/kr/allcll/seatfinder/basket/BasketService.java

@@ -56,7 +56,13 @@ private Specification<Subject> getCondition(
     public SubjectBasketsResponse getEachSubjectBaskets(Long subjectId) {
         Subject subject = subjectRepository.findById(subjectId)
             .orElseThrow(() -> new AllcllException(AllcllErrorCode.SUBJECT_NOT_FOUND));
-        List<Basket> baskets = basketRepository.findBySubjectId(subject.getId());
+        List<Basket> baskets = getBaskets(subject);
         return SubjectBasketsResponse.from(baskets);
     }
+
+    private List<Basket> getBaskets(Subject subject) {
+        return basketRepository.findBySubjectId(subject.getId()).stream()
+            .filter(Basket::isNotEmpty)
+            .toList();
+    }
 }

src/test/java/kr/allcll/seatfinder/basket/BasketApiTest.java

@@ -8,6 +8,8 @@
 import java.util.List;
 import kr.allcll.seatfinder.basket.dto.BasketsEachSubject;
 import kr.allcll.seatfinder.basket.dto.BasketsResponse;
+import kr.allcll.seatfinder.basket.dto.EachDepartmentBasket;
+import kr.allcll.seatfinder.basket.dto.SubjectBasketsResponse;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -59,4 +61,50 @@ void findAllBasket() throws Exception {
         // then
         assertThat(result.getResponse().getContentAsString()).isEqualToIgnoringWhitespace(expected);
     }
+
+    @Test
+    @DisplayName("특정 관심과목 조회의 요청과 응답을 확인한다.")
+    void findBasket() throws Exception {
+        // given
+        String expected = """
+            {
+                "eachDepartmentRegisters": [
+                    {
+                        "studentBelong": "본교생",
+                        "registerDepartment": "컴퓨터공학과",
+                        "eachCount": 10
+                    }
+                ]
+            }
+            """;
+
+        // when
+        when(basketService.getEachSubjectBaskets(1L)).thenReturn(
+            new SubjectBasketsResponse(List.of(
+                new EachDepartmentBasket("본교생", "컴퓨터공학과", 10)
+            ))
+        );
+        MvcResult result = mockMvc.perform(get("/api/baskets/1")).andExpect(status().isOk()).andReturn();
+
+        // then
+        assertThat(result.getResponse().getContentAsString()).isEqualToIgnoringWhitespace(expected);
+    }
+
+    @Test
+    @DisplayName("관심과목으로 등록한 학생이 없으면, 관심과목 조회에 빈 응답을 확인한다.")
+    void findBasketEmpty() throws Exception {
+        // given
+        String expected = """
+            {
+                "eachDepartmentRegisters": []
+            }
+            """;
+
+        // when
+        when(basketService.getEachSubjectBaskets(1L)).thenReturn(new SubjectBasketsResponse(List.of()));
+        MvcResult result = mockMvc.perform(get("/api/baskets/1")).andExpect(status().isOk()).andReturn();
+
+        // then
+        assertThat(result.getResponse().getContentAsString()).isEqualToIgnoringWhitespace(expected);
+    }
 }

src/test/java/kr/allcll/seatfinder/basket/BasketServiceTest.java

@@ -1,5 +1,6 @@
 package kr.allcll.seatfinder.basket;
 
+import static kr.allcll.seatfinder.support.fixture.BasketFixture.createEmptyBasket;
 import static kr.allcll.seatfinder.support.fixture.SubjectFixture.createSubjectWithDepartmentCode;
 import static kr.allcll.seatfinder.support.fixture.SubjectFixture.createSubjectWithDepartmentInformation;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -346,6 +347,22 @@ public void getEachSubjectBasketResponse() {
             );
     }
 
+    @Test
+    @DisplayName("과목에 대한 관심과목 담기한 인원이 없을 때는 빈 응답을 반환한다.")
+    public void emptyBasketResponse() {
+        // given
+        Subject subjectA = createSubjectWithDepartmentCode("컴공 과목A", "001234", "001", "김보예", "3210");
+        subjectRepository.save(subjectA);
+        Basket emptyBasket = createEmptyBasket(subjectA);
+        basketRepository.save(emptyBasket);
+
+        // when
+        SubjectBasketsResponse response = basketService.getEachSubjectBaskets(subjectA.getId());
+
+        // then
+        assertThat(response.eachDepartmentRegisters()).isEmpty();
+    }
+
     @Test
     @DisplayName("관심과목 인원이 0명 일 때의 동작을 확인한다.")
     public void emptyBasket() {

src/test/java/kr/allcll/seatfinder/support/fixture/BasketFixture.java

@@ -0,0 +1,18 @@
+package kr.allcll.seatfinder.support.fixture;
+
+import kr.allcll.seatfinder.basket.Basket;
+import kr.allcll.seatfinder.subject.Subject;
+
+public class BasketFixture {
+
+    /*
+        빈 Basket은 아래와 같이 생성됩니다.
+        0과 null로 초기화된 필드는 수정하면 안됩니다.
+        위 기준은 실제 API 요청으로 만들었습니다.
+     */
+    public static Basket createEmptyBasket(Subject subject) {
+        return new Basket(subject, null, null, "", "", null, null,
+            null, null, null, null, 99, 0, 0,
+            0, 99, null, 0);
+    }
+}