如何监视可迭代对象

Question

我想监视一个简单 TypeScript 类的简单数组。但是，当我设置测试并运行它时，我收到一条错误消息“createDiscounts 不可迭代”，如何模拟可迭代？

这是代码：

       // discounts.ts
         export function createDiscounts {         
           discounts: number[] = [0.5, 0.4, 0.7, 0. 9]
           return discounts.entries()
    
          }

       export class ProcessDiscountedItemsService {
        
          applyDiscounts = (items: OrderItem) => {
          for(let [number, discount] of discounts){
            //do logic
          }
        }
      }

这是我对 createDiscounts 函数的尝试

        import * as DiscountUtil from '../discounts.ts'
        describe('Process discount', () => {
        
        const service = new ProcessDiscountedItemsService()
        it('process item discounts verify' () =>{
            const items = ....
            const spy = (jest.spyOn(DiscountUtil, 'createDiscounts')) as jest.Mock
            const iteratable = [0.5, 0.4, 0.7, 0. 9].entries()
            service.applyDiscounts(items)
        })
     })

Answer 1

我用mockImplementation替换了mockResolvedValueOnce，这解决了问题