A Deep Dive into Undici Mocking Support and Use Cases | HackerNoon

1/17/2022 1:00:00 PM

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'A Deep Dive into Undici Mocking Support and Use Cases' nodejs javascript

This post goes into detail into Undici's mocking support, which enables you to write fast and reliable unit tests.

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.

Unit-testing setupFirst, let’s set up a simple example of a client class that consumes a remote dog facts API. We will have two methods:getBreedsreturns a list of breeds andgetBreedImagesreturns a list of images, taking the breed as a parameter.const { request }=require('undici'); module.exports.getBreeds=async ()=> { const { body }=await request('https://dog.ceo/api/breeds/list/all'); const data=(await body.json()).message; return data; }; module.exports.getBreedImages=async (breed)=> { const { statusCode, body }=await request( `https://dog.ceo/api/breed/${breed}/images` ); let data=(await body.json()).message; if (statusCode==404) { let e=new Error(data); e.code='BreedNotFound'; throw e; } return data; };

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from Node.There probably isn’t a Suspension Deep Dive vehicle I’ve anticipated more than the 2021 Ford F-150 Raptor.Deep Ellum should have a noise limit of 92 decibels that covers roughly Good Latimer Expressway to Walton Street, according to the report’s recommendations, and 72 decibels for the rest of the area east toward Main Street.We must preserve the past but look to the future.

js TSC member Matteo Collina. Because Undici re-invents HTTP primitives and relies directly on sockets, our established mocking approaches like Nock . It was true before I laid hands on the 2022 Ford Bronco I looked at recently, and I had the same thought when the 2021 Ram 1500 TRX paid a visit about a year ago. Luckily, Undici comes with its own built-in mocks, so we can still write unit tests against it. The report also calls for doing more to educate the public on the city’s noise rules. This post goes into detail into Undici’s mocking support, walking you through specific use-cases and examples. For one, the new third-generation has a five-link coil-spring rear suspension, and that’s something not shared with any other F-150 or anything in the massive F-Series lineup. Unit-testing setup First, let’s set up a simple example of a client class that consumes a remote dog facts API. In its early history, Deep Ellum was an isolated commercial and even industrial corner of the city.

We will have two methods: getBreeds returns a list of breeds and getBreedImages returns a list of images, taking the breed as a parameter. This makes it different from the five-link coil-spring rear suspension on the Ram 1500 TRX, which is a revision of existing Ram 2500 Power Wagon link geometry – albeit with better shocks and other significant tweaks. They spent five months surveying residents and venue owners and measuring noise in the area for the report. const { request }=require('undici'); module.exports. I was able to absolutely wring a couple of different Raptors by the neck (the standard 35-inch tire version and the new 37-inch version) during my First Drive at Dumont Dunes, a sprawling off-highway vehicle (OHV) recreation area in California’s Mojave Desert.getBreeds=async ()=> { const { body }=await request('https://dog.” Along with music, vehicle traffic is also a big driver of the noise in the area.ceo/api/breeds/list/all'); const data=(await body. This new Raptor is not just an ass-kicker when driven hard in the open desert, it’s also an utterly livable daily-driver. For many months, the Deep Ellum Noise Task Force, supported by the Deep Ellum Foundation, has been working on solutions.

json()).message; return data; }; module. Ford has also fitted Fox internal bypass Live-Valve adaptive dampers and optimized them for the new suspension.m.exports.getBreedImages=async (breed)=> { const { statusCode, body }=await request( `https://dog. Like the Raptor before it, this third-gen Raptor rides on a wide-track double wishbone front suspension, but there are numerous revisions that have increased maximum wheel travel from 13 inches to 14 inches.ceo/api/breed/${breed}/images` ); let data=(await body. The CDC said 100 decibels can be the equivalent of an approaching subway train. This is not a place that is tucked away anymore.

json()). That truck had welded steel upper and lower wishbones, but here we can clearly see the upper wishbone (yellow arrow) is forged steel and the lower wishbone (green) is made of aluminum.message; if (statusCode==404) { let e=new Error(data); e.code='BreedNotFound'; throw e; } return data; }; Using Mocha as our testing framework of choice, here are three example unit tests that verify the expected functionality of those two methods. Another travel improvement stems from the reshaped and reoriented axis of the upper ball joint that now allows more angularity as the steering knuckle is turned through its full range of motion. An air conditioner produces about 60 decibels, the CDC said. const { getBreeds, getBreedImages }=require('./dog-client'); const assert=require('assert'); describe('DogClient', function () { describe('#getBreeds()', function () { it('should return an object containing list of breeds', async function () { const breeds=await getBreeds(); assert. This is similar to the last Raptor, but quite different from the regular F-150, which uses a tie-bar held to the top surface of the lower wishbone with two smaller bolts. on Friday and Saturday.

ok(breeds..hound); assert. Further outboard, the lower wishbone and the steering knuckle feature prominent nubs (green) that work together to act as a steering stop.ok(breeds.chihuahua); }); }); describe('#getBreedImages()', function () { it('should return an array of images for known breeds', async function () { const images=await getBreedImages('hound'); assert. These differ from the older IWE design, in that the electric actuation happens here at the hub using a control wire (red) that’s just below the vacuum line.ok(images[0]. That seems just fine given the history of this area of the city.

startsWith('https://')); assert. We’re not quite at full right lock in this picture, but we’re getting close to the point where they’ll touch.ok(images[0].endsWith('. They say the manufacturing process is so dialed in that they don’t need to build in adjustment, but I’m not buying that.jpg')); }); it('should throw an error for unknown breeds', async function () { try { const images=await getBreedImages('half-chimpanzee-half-elephant'); } catch (e) { assert.equal(e. The Fox shocks develop a base level of damping within the main body of the shock, with internal bypass holes we can’t see along its length to give the damper position sensitivity. We applaud the Deep Ellum Foundation for taking this effort so seriously and putting something forward that the council should review for adoption.

code, 'BreedNotFound'); } }); }); }); These tests work great, assuming the underlying web service https://dog.ceo/api is up and responding promptly. Layered on top of that is this computer-controlled live valve (yellow), which adds additional damping depending on conditions. However, as we all know, networks are frequently unpredictable, which can wreak havoc on unit tests, causing timeouts and false negatives. That’s where mocking comes in; assuming the responses coming from the web service are fairly stable, we can replace it with an in-memory mock, whose responses are always fast and predictable. Above right we can see the upper wishbone, but there’s a lot more going on than you might think. Undici’s mocking support Nock , work by intercepting HTTP requests using Node.

js built-in HTTP stack. This was done because the Raptor’s shocks are quite a bit longer, and this upper mount has to be considerably stronger. However, Undici seeks to evolve and re-imagine that stack, and therefore does not rely on any of its modules, but relies directly on raw sockets. That’s why frameworks like Nock do not work with Undici , and that’s why it needs its own mocking support. Inside, the front bump stop (yellow) is plain to see. You will likely want to grab the latest version of the Undici module, but anything above version 4 will do, since that’s when the mocking support first shipped. The basic entry point into the mocking system is the MockAgent . The 35-inch version should have a shorter stop that enables the full 14 inches of travel.