JSJ 411: Unit Testing Jest with Daniel Caldas

JSJ 411: Unit Testing Jest with Daniel Caldas

Daniel Caldas is calling from Singapore. He currently works as a software engineer for Zendesk and has also worked in Portugal and Germany. He has worked primarily on the frontend with Node and JavaScript. He talks about his experience testing JavaScript, how he got started with Jest, and why he likes it. Daniel finds Jest very easy to use and straightforward. He likes that Jest has a single reference page for documentation. He feels that Jest is largely complete out of the box and has only made a small add on to get rid of Boilerplate in some tests.Daniel explains what a snapshot, how they work, and why he prefers fixtures over factories. He gives tips on how to set up your tests so that they are easy to follow. He finds it helps to structure your scenarios in the fixture description. He talks about gotchas in Jest. While Jest is largely easy to use, Jest has been around for a while and breaking changes do happen. It’s important to check what version your code base is using. While there are a lot of free sources around Jest online, he advises listeners to stick as close to the official documentation as possible, or to people associated with Jest, and to read recent stuff. As for conventions, Jest has pretty much everything out of the box and the built in conventions make it easy to navigate any project that uses Jest.Daniel talks about some of the features available in Jest, converting observables into promises, and tricks he has used to make tests easier to put together. He talks about his method for keeping his mocks and stubs straight. He advises listeners to have some organizational rules, such as starting the imports alphabetically, and to always follow those rules. He talks about how he runs tests and what environments he uses. While Jest is normally used for unit testing, Daniel has also used it for end to end tests, and he talks about his experience with an open source project doing both types in Jest. Daniel concludes the show by advising listeners starting with JavaScript and frontend, don’t think too much about the library you’re going to use because you’ll probably end up using Jest. It’s more important to have unit tests and a proper testing framework at the beginning than anything else. He also invites listeners to check out his open source work on Github.Panelists
  • Aimee Knight
  • AJ O’Neal
  • Charles Max Wood
**To receive your 40% OFF coupon for Manning Publications (good for all our products in all formats) visit us on Facebook - click on "Send A Message"and type "YES"**Guest
  • Danile Caldas
Sponsors
  • Sentry | Use the code “devchat” for $100 credit
LinksPicksAimee Knight:AJ O’Neal:Charles Max Wood:Daniel Caldas:Special Guest: Daniel Caldas.

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Episoder(735)

JSJ 262 Mozilla Firefox Developer Tools with Jason Laster

JSJ 262 Mozilla Firefox Developer Tools with Jason Laster

Join AJ, Aimee, and Joe as they discuss Mozilla Firefox Developer Tools with Jason Laster. Jason just started working at Mozilla since March. But even before that, he has been working on Chrome's dev tool extension called Marionette. That's when he discovered that the browser is an open source that anyone can play with. Now, he is working on a new debugger in Firefox. Tune in!Special Guest: Jason Laster. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

16 Mai 201736min

JSJ 261 HTTP 2 with Surma

JSJ 261 HTTP 2 with Surma

On today's episode, Charles, Aimee, and Cory discuss HTTP 2 with Surma. Alongside being part of the Chrome DevRel Team for Google, Surma works on different web app performance. He is also engaged in HTTP 2, interaction, UX, and spec work. Stay tuned to discover what HTTP 2 can do for you!Special Guest: Surma. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

9 Mai 20171h 2min

JSJ 260 Practical JavaScript with Gordon Zhu

JSJ 260 Practical JavaScript with Gordon Zhu

On today's episode, Charles, Joe, and Cory discuss Practical JavaScript with Gordon Zhu. Gordon is the founder of Watch and Code, and teaches the Practical JavaScript online course. His mission is to help beginners become developers through tutorials. Tune in!Special Guest: Gordon Zhu. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

2 Mai 201750min

JSJ 259 Clean Code JavaScript with Ryan McDermott

JSJ 259 Clean Code JavaScript with Ryan McDermott

On today's JavaScript Jabber Show, Charles, Joe, Aimee, Cory, and AJ discuss Clean Code JavaScript with Ryan McDermott. Ryan is a UX Engineer at Google and has been a professional developer for 5 years. He's focused on frontend Angular and backend node.js. Stay tuned to learn more about his current project with JavaScript!Special Guest: Ryan McDermott. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

25 Apr 201754min

JSJ 258 Development in a Public Institution with Shawn Clabough

JSJ 258 Development in a Public Institution with Shawn Clabough

On today's JavaScript Jabber Show, Charles and Aimee discuss Development in a Public Institution with Shawn Clabough. Shawn is a developer and developer manager at Washington State University. He works with the research office, and has been in the industry for 20 years. Tune in to this exciting episode!Special Guest: Shawn Clabough. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

18 Apr 201740min

JSJ 257 Graphcool with Johannes Schickling

JSJ 257 Graphcool with Johannes Schickling

On today's JavaScript Jabber Show, Charles, Aimee, and AJ discuss Graphcool with Johannes Schickling. Johannes is based in Berlin, Germany and is the founder of Graphcool, Inc. He also founded Optonaut, an Instagram for VR, which he sold about a year ago. Tune in to learn more about GraphQL and see what's in store for you!Special Guest: Johannes Schickling. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

11 Apr 201754min

JSJ 256 Wordpress and Wordpress API for JavaScript Developers with Roy Sivan

JSJ 256 Wordpress and Wordpress API for JavaScript Developers with Roy Sivan

On today's JavaScript Jabber Show, Charles, Aimee, Joe, and Cory discuss Wordpress and Wordpress API for JavaScript Developers with Roy Sivan. Roy is a WordPress (WP) developer at Disney Interactive. He has long been a fan of JavaScript and WP. During a WordCamp, the WP Founder announced the need for WP developers to learn JavaScript. But, what's in WP that developers should be interested about? Tune in to learn!Special Guest: Roy Sivan. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

4 Apr 201756min

JSJ 255 Docker for Developers with Derick Bailey

JSJ 255 Docker for Developers with Derick Bailey

On today's JavaScript Jabber Show, Charles Max Wood, AJ O'neal, Aimee Knight, Joe Eames, and Cory House discuss Docker for Developers with Derick Bailey. Derick is currently into Docker and has been doing a series on it at WatchMeCode. He is also writing an ebook titled Docker Recipes for Node.js Development which aims to provide solutions for things that concern Node.js. Stay tuned to learn more about Docker and the ebook which Derick is working on!Special Guest: Derick Bailey. Support this podcast at — https://redcircle.com/javascript-jabber/donationsPrivacy & Opt-Out: https://redcircle.com/privacyBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

28 Mar 20171h 20min

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