test(posts): null cursor 회귀 테스트 추가 (168671b)

listPublishedKeyset 에 cursor=null·categoryId=null 전달 시
posts-list 뷰 정상 반환 검증.
isNull() matcher 로 null 파라미터가 매퍼에 실제 전달됨을 명시.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K3FeMrbtxfTScjrwUukyHD

src/test/java/com/pandoli365/bibimbap/controller/PostControllerTest.java

@@ -29,6 +29,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.isNull;
 import static org.mockito.Mockito.lenient;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
@@ -232,6 +233,21 @@ class PostControllerTest {
         assertThat(model.getAttribute("nextCursorId")).isNull();
     }
 
+    /** 회귀(168671b): cursor=null·categoryId=null → PSQLException 없이 "posts-list" 반환. */
+    @Test
+    void list_nullCursorAndCategory_returnsPostsView() {
+        PostController controller = controller();
+        when(postsMapper.listPublishedKeyset(isNull(), isNull(), isNull(), eq(PAGE_SIZE + 1)))
+                .thenReturn(List.of());
+        lenient().when(postCategoriesMapper.listActive()).thenReturn(List.of());
+        Model model = new ExtendedModelMap();
+
+        String view = controller.list(null, null, null, model);
+
+        assertThat(view).isEqualTo("posts-list");
+        assertThat(model.getAttribute("hasNext")).isEqualTo(false);
+    }
+
     // ==== helpers ====
 
     private PostController controller() {