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Like Jest, it executes tests in parallel, which can speed up test performance.ĪVA does not have an equivalent syntax of describe for grouping tests. Like lab, there are no magic global functions. AVAĪVA is a much more opinionated test runner. The only downside to lab is outside of the hapi community, lab is not very popular. Randomizing may uncover some obscure bugs in your code, such as leaking state or calling a promise or async function without awaiting the result. Another cool feature of lab is the ability to randomize the order of test execution.
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With code coverage, you can set a percentage threshold and the runner will fail if coverage doesn’t meet the minimum threshold. Lab includes code coverage, several reporters, the ability to load a custom reporter, and was one of the first JavaScript test runners to detect memory leaks. ✔ 2 ) should return 0 when adding zeros (0 ms ) ✔ 1 ) should return 4 when adding 2 + 2 (1 ms ) However, no globals mean there are no surprises when it comes to using the API. As a result, Lab requires more setup for every suite of tests to import the lab and code dependencies. In contrast to most other test runners, Lab does not add any global functions. Lab, the test runner, typically goes hand-in-hand with code, the BDD-style assertion library created for it. However, it works well on its own and with other Node.js frameworks. It was initially designed by Walmart Labs to work seamlessly with the hapi web framework. Lab is part of the hapi developer ecosystem. Plus, if you’re also creating UIs, Jest has the advantage of supporting popular UI frameworks like React, Angular, and Vue. There are a ton of library extensions, plugins, and other tools to customize Jest however you see fit. Jest has become hugely popular in the JavaScript community, and not just for React developers. ✓ should return 0 when adding zeros (1ms ) ✓ should return 4 when adding 2 + 2 (3ms ) Jest adds several global functions to help with setting up and running tests, such as describe, it, expect, and the jest object (used mostly for mocking). The downside of parallel execution is it can make debugging tests more difficult.įor anyone coming from a BDD-style of Mocha, Jest tests are pretty familiar looking. Jest also runs multiple test suites concurrently, which can speed up the overall testing process.
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Originally designed to make UI testing easier for React developers, it’s now a full standalone suite of tools for any type of JavaScript project (including Node.js) and includes features such as a built-in assertion library, code coverage, and mocking. Jest is a testing framework developed by Facebook.
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It has a large community following with lots of tools and plugins available to customize it to fit your needs. The features it lacks can be supplemented by other proven testing utilities, such as code coverage and mocking (simulated objects/integration).
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Here is the code for calc.js.īy itself, Mocha is a solid no-frills test runner. The sample test code is a simple calculator module named calc.js. At the heart of automated tests is a good test runner.įor each of the following test runners, I’ve included a sample set of tests so you can see the basic similarities and differences between these frameworks. With every code change and at various stages along the way to production, all available tests should run in an automated fashion. The foundation for testing is automation.
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The Best Tools for Running Node.js Automated Tests If you are looking for UI testing, take a peek at Storybook, Cypress, or Puppeteer. Note: Although some of the tools covered in this post support user interface (UI) tests and front-end integration tests, the focus here is on testing pure back-end Node.js code. In this post, we’ll look at the current tools available for Node.js for running automated tests along with a few testing utilities to complement a good testing discipline.
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Testing is an essential discipline for any non-trivial software project.