diff --git a/backend/src/test/java/reviewme/api/ReviewApiTest.java b/backend/src/test/java/reviewme/api/ReviewApiTest.java
index d9262de09..9cc6f3227 100644
--- a/backend/src/test/java/reviewme/api/ReviewApiTest.java
+++ b/backend/src/test/java/reviewme/api/ReviewApiTest.java
@@ -3,6 +3,7 @@
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.ArgumentMatchers.nullable;
 import static org.springframework.restdocs.cookies.CookieDocumentation.cookieWithName;
 import static org.springframework.restdocs.cookies.CookieDocumentation.requestCookies;
 import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document;
@@ -118,7 +119,7 @@ class ReviewApiTest extends ApiTest {
 
     @Test
     void 리뷰_그룹_코드가_올바르지_않은_경우_예외가_발생한다() {
-        BDDMockito.given(reviewRegisterService.registerReview(any(ReviewRegisterRequest.class), anyLong()))
+        BDDMockito.given(reviewRegisterService.registerReview(any(ReviewRegisterRequest.class), nullable(Long.class)))
                 .willThrow(new ReviewGroupNotFoundByReviewRequestCodeException("ABCD1234"));
 
         FieldDescriptor[] requestFieldDescriptors = {
diff --git a/backend/src/test/java/reviewme/api/ReviewGroupApiTest.java b/backend/src/test/java/reviewme/api/ReviewGroupApiTest.java
index 8d2e38020..763fc13b3 100644
--- a/backend/src/test/java/reviewme/api/ReviewGroupApiTest.java
+++ b/backend/src/test/java/reviewme/api/ReviewGroupApiTest.java
@@ -2,8 +2,8 @@
 
 
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.nullable;
 import static org.springframework.restdocs.cookies.CookieDocumentation.cookieWithName;
 import static org.springframework.restdocs.cookies.CookieDocumentation.requestCookies;
 import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document;
@@ -31,7 +31,7 @@ class ReviewGroupApiTest extends ApiTest {
 
     @Test
     void 비회원용_리뷰_그룹을_생성한다() {
-        BDDMockito.given(reviewGroupService.createReviewGroup(any(ReviewGroupCreationRequest.class), anyLong()))
+        BDDMockito.given(reviewGroupService.createReviewGroup(any(ReviewGroupCreationRequest.class), nullable(Long.class)))
                 .willReturn(new ReviewGroupCreationResponse("ABCD1234"));
 
         String request = """
@@ -68,7 +68,7 @@ class ReviewGroupApiTest extends ApiTest {
 
     @Test
     void 회원용_리뷰_그룹을_생성한다() {
-        BDDMockito.given(reviewGroupService.createReviewGroup(any(ReviewGroupCreationRequest.class), anyLong()))
+        BDDMockito.given(reviewGroupService.createReviewGroup(any(ReviewGroupCreationRequest.class), nullable(Long.class)))
                 .willReturn(new ReviewGroupCreationResponse("ABCD1234"));
 
         CookieDescriptor[] cookieDescriptors = {