Chrome Extension - Site Page Review - Message Handler test using jest.mock to mock underlying handlers

eventHandler.test.ts

/* eslint-disable @typescript-eslint/no-explicit-any */
import { MessageRate } from "../../types/message.types"
import { messageHandler } from "./eventHandler"
import { ratingMessageHandler } from "./onMessageHandlers/ratingMessageHandler"

jest.mock("./onMessageHandlers/ratingMessageHandler")

describe("messageHandler", () => {
    const sendResponseMock = jest.fn()

    beforeEach(() => {
        jest.clearAllMocks()
    })

    it('should delegate "rating" message to ratingMessageHandler and return true', () => {
        const message: Message<MessageRate> = {
            type: "rating",
            subType: "update",
            data: { url: "http://example.com", rate: 5 },
        }
        const sender = { tab: { id: 1 } }

        const result = messageHandler(message, sender as any, sendResponseMock)

        expect(ratingMessageHandler).toHaveBeenCalledWith(
            message,
            sendResponseMock,
        )
        expect(result).toBe(true)
    })

    it("Should respond synchronously and immediately to the content script when an incorrect message type is detected", () => {
        // ... Full example can be found on https://github.com/EduardoAC/site-review-extension/blob/master/src/serviceWorker/events/eventHandler.test.ts
    })

    it("Should respond synchronously if sender.tab is absent, immediately returning a response to the content script", () => {
        //... Full example can be found on https://github.com/EduardoAC/site-review-extension/blob/master/src/serviceWorker/events/eventHandler.test.ts
    })

    it("Should respond synchronously if message.type is missing, immediately returning a response to the content script", () => {
        //... Full example can be found on https://github.com/EduardoAC/site-review-extension/blob/master/src/serviceWorker/events/eventHandler.test.ts
    })
})

The code for messageHandler can be found at https://github.com/EduardoAC/site-review-extension/blob/master/src/serviceWorker/events/eventHandler.ts

The original test file can be found at https://github.com/EduardoAC/site-review-extension/blob/master/src/serviceWorker/events/eventHandler.test.ts