'A Deep Dive into Undici Mocking Support and Use Cases' nodejs javascript
Because Undici re-invents HTTP primitives and relies directly on sockets, our established mocking approaches like Nock
. Luckily, Undici comes with its own built-in mocks, so we can still write unit tests against it. This post goes into detail into Undici’s mocking support, walking you through specific use-cases and examples.First, let’s set up a simple example of a client class that consumes a remote dog facts API. We will have two methods:returns a list of images, taking the breed as a parameter.
const { request }=require; module.exports.getBreeds=async => { const { body }=await request; const data=).message; return data; }; module.exports.getBreedImages=async => { const { statusCode, body }=await request; let data=).message; if { let e=new Error; e.code='BreedNotFound'; throw e; } return data; };as our testing framework of choice, here are three example unit tests that verify the expected functionality of those two methods.
const { getBreeds, getBreedImages }=require; const assert=require; describe { describe', function { it { const breeds=await getBreeds; assert.ok; assert.ok; }); }); describe', function { it { const images=await getBreedImages; assert.ok); assert.ok); }); it { try { const images=await getBreedImages; } catch { assert.equal; } }); }); });is up and responding promptly.
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