webpack - 导入*为( Jasmine spyOn)不可写

Question

升级到babel 7.1.5后，当我使用import * as时，我的测试失败。

test.spec.js

import * as Helper from "../../../../src/renderer/modules/Helper";

describe('Testing', () => {
    it('Should import correctly', () => {
        console.log(Helper.test()) // a
        spyOn(Helper, 'test').and.returnValue('b');
    });
});

Helper.js

function test() {
    return 'a'
}

export {test}

错误

'Upgrade.spec.js (7:8)', 'a'

Error: <spyOn> : test is not declared writable or has no setter
Usage: spyOn(<object>, <methodName>)
    at <Jasmine>
    at UserContext.it (webpack:///./test/unit/specs/renderer/Upgrade.spec.js?:7:5)
    at <Jasmine>

Answer 1

来源：Can webpack 4 modules be configured as to allow Jasmine to spy on their members?

有一个spyOnProperty，通过将accessType参数设置为'get'可以将属性视为只读。

您的设置将如下所示

import * as mod from 'my/module';
//...
const funcSpy = jasmine.createSpy('myFunc').and.returnValue('myMockReturnValue');
spyOnProperty(mod, 'myFunc', 'get').and.returnValue(funcSpy);