4 replies

Mocking fetch with Jest for a Cloudlare Worker

Hi all - i'm trying to figure out something that potentially could be very simple.

I've got a Worker running on Cloudflare that pulls data from an external API, via fetch.

Inside my 'fetchData.ts' I have the following.

const response = await fetch(env.ENDPOINT, {
        method: "POST",
        headers: {
            Authorization: `Basic ${btoa(
                `someKey`
            )}]`,
            "Content-Type": "application/x-www-form-urlencoded"
        },
        body: "someBody"
    });

const response = await fetch(env.ENDPOINT, {
        method: "POST",
        headers: {
            Authorization: `Basic ${btoa(
                `someKey`
            )}]`,
            "Content-Type": "application/x-www-form-urlencoded"
        },
        body: "someBody"
    });

I'm trying to write a 'testData.test.ts' file to check that fetch was called with the correct args.

If I was working with a node environment i'd just mock out node-fetch and check what the mock was called with.

With the worker, fetch is global, so I have no idea what to mock.

Any help with this would be much appreciated

Cloudflare Developers•3y ago•

4 replies

jpbrown84

Mocking fetch with Jest for a Cloudlare Worker

const response = await fetch(env.ENDPOINT, {
        method: "POST",
        headers: {
            Authorization: `Basic ${btoa(
                `someKey`
            )}]`,
            "Content-Type": "application/x-www-form-urlencoded"
        },
        body: "someBody"
    });

const response = await fetch(env.ENDPOINT, {
        method: "POST",
        headers: {
            Authorization: `Basic ${btoa(
                `someKey`
            )}]`,
            "Content-Type": "application/x-www-form-urlencoded"
        },
        body: "someBody"
    });

Mocking fetch with Jest for a Cloudlare Worker

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