Jest导入组件的模拟变量

Question

我正在尝试模拟我的应用程序组件中的一个变量(auth(，因为它正在进行条件呈现。我应该如何在不尝试导出变量本身的情况下执行此操作？几天来，我一直在尝试各种解决方案，但似乎无法涵盖，现在我陷入了困境。

App.js

import React from "react";
import { useRoutes } from "react-router-dom";
import Routing from "./routes";
import useAuth from "./hooks/useAuth";
import SplashScreen from "./components/splashScreen/SplashScreen";
const App = () => {
const content = useRoutes(Routing());
const auth = useAuth();
return (
<>
{auth.isInitialized ? content : <SplashScreen />}
</>
);
};
export default App;

App.test.js

import React from "react";
import { mount } from "enzyme";
import App from "./App";
import { BrowserRouter } from "react-router-dom";
describe("App Unit Tests", () => {
let wrapper;
beforeEach(() => {
wrapper = mount(
<BrowserRouter>
<App />
</BrowserRouter>
);
});
it("App should render", () => {
expect(wrapper.length).toEqual(1);
});
//Below fails 
it("should render splashscreen", () => {
jest.mock("./hooks/useAuth", () => ({
isInitialized: false,
}));
expect(wrapper.length).toEqual(1);
});
it("should render content", () => {
jest.mock("./hooks/useAuth", () => ({
isInitialized: true,
}));
expect(wrapper.length).toEqual(1);
});
});

Answer 1

您可以这样做：

jest.mock('./hooks/use-auth', () => ({
isInitialized: true
});

这基本上意味着use-auth返回具有inInitialized属性的对象

Answer 2

应该将useAuth挂钩模拟为具有isInitializedgetter的对象(比如mockUseAuth(，而不是auth。getter应该返回一个mockIsInitialized值，该值可以根据每个测试用例进行更改。类似这样的东西：

let mockIsInitialized = true;
let mockUseAuth = {
isAuthenticated: true
};
Object.defineProperty(mockUseAuth, 'isInitialized', {
get: jest.fn(() => mockIsInitialized)
});
jest.mock('./hooks/use-auth', () => {
return jest.fn(() => (mockUseAuth))
})
describe("App Unit Tests", () => {
let wrapper;
beforeEach(() => {
wrapper = mount(
<BrowserRouter>
<App />
</BrowserRouter>
);
});
it("App should render", () => {
expect(wrapper.length).toEqual(1);
});
it("should render splashscreen", () => {
mockIsInitialized = false;
expect(wrapper.length).toEqual(1);
});
it("should render content", () => {
mockIsInitialized = true;
expect(wrapper.length).toEqual(1);
});
});