如何测试回叫功能？ VUE / JEST

Question

我不知道如何测试updateTotal ...如果requestAxios是否成功返回回调函数updateTotal，但是我怎么监视呢？

...methods:{

     updateAll() {

          const updateTotal = (request) => {
              this.total = request.data.total
          }

          this.requestAxios(
             'get',
              '/api/',
              {},
              [updateTotal],
          )

       }
}...

requestAxios：

async requestAxios(
            method = 'get',
            url = '',
            objSend = {},
            successFunctions = [],
            errorsFunctions = [],
            formKey = 'form',
        ) {

        let request = ''

        if (method !== 'delete') {
            request = await axios[method](url, objSend, this.headerRequestJson)
                .then(response => this.responseRequestText(response))
                .catch(errors => this.responseRequestText(errors.response));
        } else {
            request = await axios.delete(url, {
                data: objSend,
                headers: this.headerRequestJson.headers,
            })
                .then(response => this.responseRequestText(response))
                .catch(errors => this.responseRequestText(errors.response));
        }

        if (request.status === 'success') {
            // success callback fn
            successFunctions.forEach((value) => {
                value(request, formKey)
            })
        } else {
            // errors callback fn
            errorsFunctions.forEach((value) => {
                value(request)
            })
            // adicionar erros nos campos
            this.addErrors(request, formKey);
        }
    },

我的尝试：

test('updateTotalFinancial: ', () => {
            const update = jest.fn()
            const response = {
                data: {
                    total: 100,
                },
            }
            const requestAxios = jest.fn(() => update(response))

            const wrapper = shallowMount(ModalUnderwriting, {
                store,
                localVue,
                methods: {
                    requestAxios,
                },

            })
            wrapper.setData({
               total: '0',
            })

            wrapper.vm.updateTotalFinancial()

首先期望成功，其次不是，不更新数据/变量total

expect(update).toBeCalled()
expect(wrapper.vm.total).toEqual(100)