Question

import * as PlanReducer from '../../../reducers/planReducer';

describe('currentPlanReducer()', () => {

   beforeAll(() => {

      spyOn(PlanReducer, 'planReducer').and.callThrough();

   });
});

PlanRedcuer是：

export default function planReducer(state = INITIAL_STATE, action) {....}

它在测试期间抛出一个错误，计划redRedcuer不是一个方法，我试图导入其他类似的方法（这不是导出默认值）并且它有效。任何人都可以帮助我如何监视这个功能并进行测试吗？

Answer 1

您未将planReducer功能导出为planReducer，而是default。因此，在测试中你应该监视default属性：

spyOn(PlanReducer, 'default').and.callThrough();

或者，您可以将planReducer导出为default和planReducer：

const planReducer = function planReducer(state = INITIAL_STATE, action) {...}
export {planReducer}
export default planReducer

Answer 2

试试这个：import PlanReducer from '../../../reducers/planReducer';

如果您在planReducer中查看生成的javascript，您会看到'export default function planReducer'结果为“exports.default = planReducer;'

在测试/规范import * as PlanReducer from '../../../reducers/planReducer';生成的javascript中导致spyOn(planReducer, 'planReducer').and.callThrough();

但使用import PlanReducer from '../../../reducers/planReducer';会导致spyOn(app_1.default, 'planReducer').and.callThrough();引用默认导出。

spyOn功能不起作用 - 茉莉花

2 个答案: