我的模拟上没有任何可用的jest.fn()方法，当使用es6导出/导入时

Question

我有一个猫鼬模型，设置如下，

模型.TS

export interface LocationInterface extends mongoose.Document {
name: string;
description: string;
}
export const Location = mongoose.model<LocationInterface>(
process.env.DB_CONTAINER || "Null",
locationSchema
);

然后我嘲笑它，

https://jestjs.io/docs/en/mock-function-api

//tests.ts

Import Location from ‘./model’;
Location.create = jest.fn();

然后我想确认它何时发送 json 响应，它收到的正常。

it("should return json body in response", () => {
Location.create.  // => no mockReturnValue method is avaliable here??

我已经尝试了以下方法，但它不起作用。 如何使用 Jest 模拟 ES6 模块导入？

jest.mock("./model", () => ({
Location: jest.fn()
}));

我尝试使用导出默认位置，这也不起作用。

我尝试了以下方法，但也没有奏效。

jest.mock("../../../src/models/location.model", () => Location.create);

我从 https://codewithhugo.com/jest-mock-spy-module-import/尝试了以下内容

import * as mockDB from "./model";
jest.mock('.model', () => ({
get: jest.fn(),
set: jest.fn()
}));

expect(mockDb.Location.create. // -> No Methods available

Answer 1

这篇博客文章解决了我所有的问题。

https://dev.to/terabaud/testing-with-jest-and-typescript-the-tricky-parts-1gnc

import { mocked } from "ts-jest/utils";
import Location from "/model";
jest.mock("../../../src/models/location.model", () => {
return jest.fn();
});
it("should recieve a code 201 and json response", async () => {
// Mock Response
mocked(Location.create).mockImplementation(
(): Promise<any> => {
return Promise.resolve(dummyRecord);
}
);
const response = await DatabaseService.createRecord(dummyRecord, Location);
expect(response).toStrictEqual({
code: 201,
data: dummyRecord
})
});