diff --git a/src/test/java/com/involutionhell/backend/events/service/EventServiceTests.java b/src/test/java/com/involutionhell/backend/events/service/EventServiceTests.java
new file mode 100644
index 0000000..e3270d9
--- /dev/null
+++ b/src/test/java/com/involutionhell/backend/events/service/EventServiceTests.java
@@ -0,0 +1,164 @@
+package com.involutionhell.backend.events.service;
+
+import com.involutionhell.backend.events.model.Event;
+import com.involutionhell.backend.events.repository.EventInterestRepository;
+import com.involutionhell.backend.events.repository.EventRepository;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.*;
+
+/**
+ * EventService 单元测试。
+ * 主要验证对 EventRepository 和 EventInterestRepository 的委托逻辑。
+ */
+@ExtendWith(MockitoExtension.class)
+class EventServiceTests {
+
+    @Mock
+    private EventRepository eventRepository;
+
+    @Mock
+    private EventInterestRepository interestRepository;
+
+    @InjectMocks
+    private EventService eventService;
+
+    // ────────────────────────────────────────────────────────────────────────
+    // ── EventRepository 委托测试 ─────────────────────────────────────────────
+    // ────────────────────────────────────────────────────────────────────────
+
+    @Test
+    void listPublic_delegatesToRepository() {
+        Event e1 = new Event(1L, "T1", "", null, null, null, null, null, null, null, "published", null, null, null);
+        when(eventRepository.findPublic()).thenReturn(List.of(e1));
+
+        List<Event> result = eventService.listPublic();
+
+        assertThat(result).hasSize(1).contains(e1);
+        verify(eventRepository).findPublic();
+    }
+
+    @Test
+    void listAllForAdmin_delegatesToRepository() {
+        Event e1 = new Event(1L, "T1", "", null, null, null, null, null, null, null, "draft", null, null, null);
+        when(eventRepository.findAllForAdmin()).thenReturn(List.of(e1));
+
+        List<Event> result = eventService.listAllForAdmin();
+
+        assertThat(result).hasSize(1).contains(e1);
+        verify(eventRepository).findAllForAdmin();
+    }
+
+    @Test
+    void findById_delegatesToRepository() {
+        Event e1 = new Event(1L, "T1", "", null, null, null, null, null, null, null, "published", null, null, null);
+        when(eventRepository.findById(1L)).thenReturn(Optional.of(e1));
+
+        Optional<Event> result = eventService.findById(1L);
+
+        assertThat(result).isPresent().contains(e1);
+        verify(eventRepository).findById(1L);
+    }
+
+    @Test
+    void create_delegatesToRepository() {
+        Event draft = new Event(null, "New", "", null, null, null, null, null, null, null, "draft", null, null, null);
+        Event created = new Event(1L, "New", "", null, null, null, null, null, null, null, "draft", null, Instant.now(), Instant.now());
+        when(eventRepository.insert(draft)).thenReturn(created);
+
+        Event result = eventService.create(draft);
+
+        assertThat(result).isEqualTo(created);
+        verify(eventRepository).insert(draft);
+    }
+
+    @Test
+    void update_delegatesToRepository() {
+        Event updateData = new Event(1L, "Updated", "", null, null, null, null, null, null, null, "published", null, Instant.now(), null);
+        Event updated = new Event(1L, "Updated", "", null, null, null, null, null, null, null, "published", null, Instant.now(), Instant.now());
+        when(eventRepository.update(updateData)).thenReturn(updated);
+
+        Event result = eventService.update(updateData);
+
+        assertThat(result).isEqualTo(updated);
+        verify(eventRepository).update(updateData);
+    }
+
+    @Test
+    void delete_delegatesToRepository() {
+        eventService.delete(1L);
+        verify(eventRepository).deleteById(1L);
+    }
+
+    // ────────────────────────────────────────────────────────────────────────
+    // ── EventInterestRepository 委托测试 ──────────────────────────────────────
+    // ────────────────────────────────────────────────────────────────────────
+
+    @Test
+    void countInterest_delegatesToRepository() {
+        when(interestRepository.countByEvent(100L)).thenReturn(42L);
+
+        long result = eventService.countInterest(100L);
+
+        assertThat(result).isEqualTo(42L);
+        verify(interestRepository).countByEvent(100L);
+    }
+
+    @Test
+    void countInterestByEventIds_delegatesToRepository() {
+        Set<Long> ids = Set.of(100L, 200L);
+        Map<Long, Long> expectedMap = Map.of(100L, 10L, 200L, 5L);
+        when(interestRepository.countByEventIds(ids)).thenReturn(expectedMap);
+
+        Map<Long, Long> result = eventService.countInterestByEventIds(ids);
+
+        assertThat(result).isEqualTo(expectedMap);
+        verify(interestRepository).countByEventIds(ids);
+    }
+
+    @Test
+    void countInterestByEventIds_emptyCollection_returnsEmptyMapAndDelegates() {
+        Set<Long> ids = Set.of();
+        when(interestRepository.countByEventIds(ids)).thenReturn(Map.of());
+
+        Map<Long, Long> result = eventService.countInterestByEventIds(ids);
+
+        assertThat(result).isEmpty();
+        verify(interestRepository).countByEventIds(ids);
+    }
+
+    @Test
+    void isInterested_delegatesToRepository() {
+        when(interestRepository.isInterested(100L, 1L)).thenReturn(true);
+        when(interestRepository.isInterested(100L, 2L)).thenReturn(false);
+
+        assertThat(eventService.isInterested(100L, 1L)).isTrue();
+        assertThat(eventService.isInterested(100L, 2L)).isFalse();
+
+        verify(interestRepository).isInterested(100L, 1L);
+        verify(interestRepository).isInterested(100L, 2L);
+    }
+
+    @Test
+    void markInterested_delegatesToRepository() {
+        eventService.markInterested(100L, 1L);
+        verify(interestRepository).add(100L, 1L);
+    }
+
+    @Test
+    void unmarkInterested_delegatesToRepository() {
+        eventService.unmarkInterested(100L, 1L);
+        verify(interestRepository).remove(100L, 1L);
+    }
+}