javascript - Undefined 不是构造函数 Jasmine Enzyme Karma

Question

嘿，我一直在配置 karma + Jasmine + enzyme ，开始在我的项目的单元测试中工作，然后在执行我的第一个测试时，我得到了这个错误

TypeError:未定义不是构造函数(在 src/app/modules/Login/LoginComponent.spec.js 中评估 '(0, _jasmine.expect)(addLoan.length)')(第 80581 行)
src/app/modules/Login/LoginComponent.spec.js:80581:29
已加载@http://localhost:9876/context.js:151:17

然后这是我的测试代码:

import React from 'react';
import { expect } from 'jasmine';
import { shallow } from 'enzyme';
import ServicerComponent from './LoginComponent';

function setup() {
    const props = {
        error: {},
        onClick: () => {},
        emailOnChange: () => {},
        passwordOnChange: () => {},
    };

    return shallow(<ServicerComponent{...props} />);
}

describe('<ServicerComponent />', () => {
    const displayNames = {
        login: 'login',
    };
    let wrapper;

    beforeEach(() => {
        wrapper = setup();
    });

    it('should have a Login button', () => {
        const addLoan = wrapper.find({ name: displayNames.login });

        expect(addLoan.length).toBe(1);
    });
});

我也在使用: Jasmine :2.5.3 enzyme :2.7.1

Answer 1

您需要创建该类的安装实例

beforeEach(() => {
        wrapper = new setup();
    });