嘲笑节点模块中的特定类 [英] Mock a specific class from a node module in jest

问题描述

我只想模拟net节点模块中的Socket类(文档).

I would like to mock just the Socket class from the net node module (Docs).

我有一堂课，看起来像这样...

I have a class that looks something like this...

import { Socket } from 'net';

class Foo {
    protected socket: Socket;

    constructor() {
        this.socket = new Socket();
    }

    connect() {
        const connPromise = new Promise<undefined>(resolve => {
            this.socket.connect(80, '192.168.1.1', () => {
                // Do some stuff with local state

                resolve();
            });
        });

        return connPromise;
    }
}

我不确定如何模拟Socket类，因此可以为this.socket.connect提供模拟实现.

I am unsure how to mock the Socket class so I can provide the mock implementation for this.socket.connect.

import { Foo } from './foo';

// Can I just mock the Socket Class somehow?
jest.mock('net')

describe("Foo", () => {
    it('resolves on connect', () => {
        const tester = new Foo();

        expect(tester.connect()).resolves.toBeUndefined();
    })
})

如何控制this.socket.connect方法的实现?

推荐答案

尝试提供(编辑，因为我忘记了您不能从玩笑工厂的外部范围中引用函数:D)

(Edited because I forgot you could not reference functions from the outer scope within a jest factory :D)

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