diff --git a/src/test/java/com/example/g8backend/service/AdminServiceImplTest.java b/src/test/java/com/example/g8backend/service/AdminServiceImplTest.java
new file mode 100644
index 0000000..f8e6229
--- /dev/null
+++ b/src/test/java/com/example/g8backend/service/AdminServiceImplTest.java
@@ -0,0 +1,38 @@
+package com.example.g8backend.service;
+
+import com.example.g8backend.entity.User;
+import com.example.g8backend.mapper.UserMapper;
+import com.example.g8backend.service.impl.AdminServiceImpl;
+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 static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+public class AdminServiceImplTest {
+    @Mock
+    private UserMapper userMapper;
+    @InjectMocks
+    private AdminServiceImpl adminService;
+
+    @Test
+    public void testGrantVip_Success() {
+        User user = new User();
+        user.setUserId(1L);
+        when(userMapper.selectById(1L)).thenReturn(user);
+
+        boolean result = adminService.grantVip(1L);
+        assertTrue(result);
+        assertEquals("vip", user.getUserLevel());
+    }
+
+    @Test
+    public void testGrantVip_UserNotFound() {
+        when(userMapper.selectById(1L)).thenReturn(null);
+        boolean result = adminService.grantVip(1L);
+        assertFalse(result);
+    }
+}
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