修改了代码结构

src/test/java/com/greenorange/promotion/junit/PromoCodeServiceImplTest.java

@@ -0,0 +1,79 @@
+package com.greenorange.promotion.junit;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.greenorange.promotion.model.dto.CommonBatchRequest;
+import com.greenorange.promotion.model.entity.PromoCode;
+import com.greenorange.promotion.service.project.impl.PromoCodeServiceImpl;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Spy;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class PromoCodeServiceImplTest {
+
+    @Spy
+    @InjectMocks
+    private PromoCodeServiceImpl service;
+    // Spy + InjectMocks：使用真实的 PromoCodeServiceImpl，但可以 stub 它的 list(...) 和 removeByIds(...)
+
+    /**
+     * 当存在状态为“占用”的推广码时，应抛出异常并且不执行删除
+     */
+    @Test
+    void delBatchPromoCode_whenCodesInUse_shouldThrow() {
+        // Arrange
+        List<Long> ids = Arrays.asList(1L, 2L, 3L);
+        CommonBatchRequest req = new CommonBatchRequest();
+        req.setIds(ids);
+
+        // 模拟 list(...) 返回一个非空列表，表示有正在使用的推广码
+        PromoCode inUse = new PromoCode();
+        inUse.setId(2L);
+        inUse.setPromoCodeStatus(true);
+        doReturn(Collections.singletonList(inUse))
+            .when(service).list(any(LambdaQueryWrapper.class));
+
+        // Act & Assert
+        RuntimeException ex = assertThrows(RuntimeException.class,
+            () -> service.delBatchPromoCode(req));
+        assertTrue(ex.getMessage().contains("当前推广码正在使用中"));
+
+        // 验证 removeByIds(...) 从未被调用
+        verify(service, never()).removeByIds(anyList());
+    }
+
+    /**
+     * 当所有推广码都未被占用时，应正常调用 removeByIds 删除
+     */
+    @Test
+    void delBatchPromoCode_whenNoCodesInUse_shouldRemove() {
+        // Arrange
+        List<Long> ids = Arrays.asList(4L, 5L);
+        CommonBatchRequest req = new CommonBatchRequest();
+        req.setIds(ids);
+
+        // 模拟 list(...) 返回空列表，表示无任何占用的推广码
+        doReturn(Collections.emptyList())
+            .when(service).list(any(LambdaQueryWrapper.class));
+
+        // 模拟 removeByIds(...) 返回 true，表示删除成功
+        doReturn(true).when(service).removeByIds(ids);
+
+        // Act
+        service.delBatchPromoCode(req);
+
+        // Assert
+        // 验证 removeByIds(...) 被调用一次，且参数正是传入的 ids
+        verify(service, times(1)).removeByIds(ids);
+    }
+}