feat: 그룹 유량제어 메트릭 API 추가

- GroupMetricDTO: allowed/rejectedPerSecond/rejectedThreshold/rejectRatio 등
- InflowGroupMetricService: DualInflowControlManager를 통한 메트릭 조회·초기화
  (getManager() protected 처리 — 단위 테스트 서브클래싱 지원)
- InflowGroupMetricController: 4개 엔드포인트
  GET  /{groupId}/metric, GET  /metric
  POST /{groupId}/metric/reset, POST /metric/reset
- 단위 테스트 2종 (Service 16건, Controller 8건) 전체 통과
- elink-online-common 서브모듈 포인터 업데이트

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/test/java/com/eactive/eai/manage/inflow/InflowGroupMetricControllerTest.java

@@ -0,0 +1,173 @@
+package com.eactive.eai.manage.inflow;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.util.ReflectionTestUtils;
+
+/**
+ * InflowGroupMetricController 단위 테스트.
+ *
+ * <p>Spring MVC를 기동하지 않고 컨트롤러를 직접 인스턴스화하여
+ * 응답 구조(success, data, count, message)를 검증한다.
+ */
+class InflowGroupMetricControllerTest {
+
+    private InflowGroupMetricController controller;
+    private InflowGroupMetricService mockService;
+
+    @BeforeEach
+    void setUp() {
+        controller  = new InflowGroupMetricController();
+        mockService = mock(InflowGroupMetricService.class);
+        ReflectionTestUtils.setField(controller, "metricService", mockService);
+    }
+
+    // -------------------------------------------------------------------------
+    // Helper
+    // -------------------------------------------------------------------------
+
+    private GroupMetricDTO makeDTO(String groupId, String groupName,
+                                   long allowed, long rejPs, long rejTh) {
+        GroupMetricDTO dto = new GroupMetricDTO();
+        dto.setGroupId(groupId);
+        dto.setGroupName(groupName);
+        dto.setActivate(true);
+        dto.setAllowed(allowed);
+        dto.setRejectedPerSecond(rejPs);
+        dto.setRejectedThreshold(rejTh);
+        long total = allowed + rejPs + rejTh;
+        dto.setTotalRequests(total);
+        dto.setRejectRatio(total > 0 ? (double)(rejPs + rejTh) / total * 100 : 0.0);
+        dto.setLastResetTime(System.currentTimeMillis());
+        return dto;
+    }
+
+    @SuppressWarnings("unchecked")
+    private Map<String, Object> body(ResponseEntity<?> response) {
+        return (Map<String, Object>) response.getBody();
+    }
+
+    // =========================================================================
+    // GET /{groupId}/metric
+    // =========================================================================
+
+    @Test
+    void getGroupMetric_found_successTrueAndDataPresent() {
+        GroupMetricDTO dto = makeDTO("G1", "결제그룹", 900, 60, 40);
+        when(mockService.getGroupMetric("G1")).thenReturn(dto);
+
+        ResponseEntity<?> response = controller.getGroupMetric("G1");
+        Map<String, Object> body = body(response);
+
+        assertEquals(200, response.getStatusCodeValue());
+        assertEquals(Boolean.TRUE, body.get("success"));
+        assertSame(dto, body.get("data"));
+        assertFalse(body.containsKey("message"), "성공 응답에 message 필드는 없어야 합니다");
+    }
+
+    @Test
+    void getGroupMetric_notFound_successFalseWithMessage() {
+        when(mockService.getGroupMetric("GHOST")).thenReturn(null);
+
+        ResponseEntity<?> response = controller.getGroupMetric("GHOST");
+        Map<String, Object> body = body(response);
+
+        assertEquals(200, response.getStatusCodeValue());
+        assertEquals(Boolean.FALSE, body.get("success"));
+        assertTrue(body.get("message").toString().contains("GHOST"),
+                "오류 메시지에 groupId가 포함되어야 합니다");
+    }
+
+    // =========================================================================
+    // GET /metric
+    // =========================================================================
+
+    @Test
+    void getAllGroupMetrics_returnsListAndCount() {
+        List<GroupMetricDTO> list = Arrays.asList(
+                makeDTO("G1", "그룹1", 100, 5, 0),
+                makeDTO("G2", "그룹2", 200, 0, 10)
+        );
+        when(mockService.getAllGroupMetrics()).thenReturn(list);
+
+        ResponseEntity<?> response = controller.getAllGroupMetrics();
+        Map<String, Object> body = body(response);
+
+        assertEquals(Boolean.TRUE, body.get("success"));
+        assertSame(list, body.get("data"));
+        assertEquals(2, body.get("count"));
+    }
+
+    @Test
+    void getAllGroupMetrics_emptyList_countZero() {
+        when(mockService.getAllGroupMetrics()).thenReturn(Collections.emptyList());
+
+        ResponseEntity<?> response = controller.getAllGroupMetrics();
+        Map<String, Object> body = body(response);
+
+        assertEquals(Boolean.TRUE, body.get("success"));
+        assertEquals(0, body.get("count"));
+    }
+
+    // =========================================================================
+    // POST /{groupId}/metric/reset
+    // =========================================================================
+
+    @Test
+    void resetGroupMetric_success_successTrueWithGroupId() {
+        when(mockService.resetGroupMetric("G1")).thenReturn(true);
+
+        ResponseEntity<?> response = controller.resetGroupMetric("G1");
+        Map<String, Object> body = body(response);
+
+        assertEquals(Boolean.TRUE, body.get("success"));
+        assertTrue(body.get("message").toString().contains("G1"),
+                "성공 메시지에 groupId가 포함되어야 합니다");
+    }
+
+    @Test
+    void resetGroupMetric_notFound_successFalseWithGroupId() {
+        when(mockService.resetGroupMetric("GHOST")).thenReturn(false);
+
+        ResponseEntity<?> response = controller.resetGroupMetric("GHOST");
+        Map<String, Object> body = body(response);
+
+        assertEquals(Boolean.FALSE, body.get("success"));
+        assertTrue(body.get("message").toString().contains("GHOST"),
+                "오류 메시지에 groupId가 포함되어야 합니다");
+    }
+
+    // =========================================================================
+    // POST /metric/reset
+    // =========================================================================
+
+    @Test
+    void resetAllGroupMetrics_alwaysSuccessTrue() {
+        doNothing().when(mockService).resetAllGroupMetrics();
+
+        ResponseEntity<?> response = controller.resetAllGroupMetrics();
+        Map<String, Object> body = body(response);
+
+        assertEquals(Boolean.TRUE, body.get("success"));
+        assertNotNull(body.get("message"));
+        verify(mockService).resetAllGroupMetrics();
+    }
+
+    @Test
+    void resetAllGroupMetrics_callsDelegateOnce() {
+        doNothing().when(mockService).resetAllGroupMetrics();
+
+        controller.resetAllGroupMetrics();
+
+        verify(mockService, times(1)).resetAllGroupMetrics();
+    }
+}