posthog/jest.setup.fetch-mock.js

const { readFileSync } = require('fs')
const { DateTime } = require('luxon')
const { join } = require('path')

jest.mock('node-fetch', () => {
    const responsesToUrls = {
        'https://google.com/results.json?query=fetched': { count: 2, query: 'bla', results: [true, true] },
        'https://mmdb.posthog.net/': readFileSync(join(__dirname, 'tests', 'assets', 'GeoLite2-City-Test.mmdb.br')),
    }
    const headersToUrls = {
        'https://mmdb.posthog.net/': new Map([
            ['content-type', 'vnd.maxmind.maxmind-db'],
            ['content-disposition', `attachment; filename="GeoLite2-City-${DateTime.local().toISODate()}.mmdb"`],
        ]),
    }
    return jest.fn(
        (url) =>
            new Promise((resolve) =>
                resolve({
                    buffer: () => new Promise((resolve) => resolve(responsesToUrls[url]) || Buffer.from('fetchmock')),
                    json: () => new Promise((resolve) => resolve(responsesToUrls[url]) || { fetch: 'mock' }),
                    text: () => new Promise((resolve) => resolve(JSON.stringify(responsesToUrls[url])) || 'fetchmock'),
                    headers: headersToUrls[url],
                })
            )
    )
})