Yonatan Kra

Yonatan Kra

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Magic Trick to Write Effective Tests

The One Trick to Writing Effective Tests

February 20, 2023February 20, 2023 Yonatan KraLeave a Comment on The One Trick to Writing Effective Tests

How do you know your test is effective? How do you know your test protects you from breaking changes? And how can you do TDD without doing TDD? The best distillment of TDD taken from a TDD workshop in JFokus.…

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Improve Your Tests Like a Ninja

3 Simple Habits to Improve Your Tests

February 12, 2023February 12, 2023 Yonatan KraLeave a Comment on 3 Simple Habits to Improve Your Tests

How can tests be your best documentation? What small changes can improve the contract between your code and its consumers? Learn how to improve your tests from a real-world example.

Yes, we write them to ensure fewer things break before …

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Chrome Extension to style social media text

How to Build a Chrome Extension that will Make Your Facebook Posts Better?

August 31, 2022September 1, 2022 Yonatan KraLeave a Comment on How to Build a Chrome Extension that will Make Your Facebook Posts Better?

How to build a chrome extension, manipulate and interact with a page and publish it to the Chrome Web Store? Here’s how I created a Chrome extension that enables me to style the text in my posts and comments – …

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The Coupling Pitfall on Slack

What is the Coupling Pitfall and how to Avoid it?

July 31, 2022August 1, 2022 Yonatan KraLeave a Comment on What is the Coupling Pitfall and how to Avoid it?

How to avoid constant tests maintenance and regressions in your code? In this article, we will talk about a new term “the Coupling Pitfall”, what harm it is doing to your code, and a way to fix it.

What are

…
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Understanding Unit Tests in Javascript: 5 Frameworks

June 29, 2022June 29, 2022 Yonatan KraLeave a Comment on Understanding Unit Tests in Javascript: 5 Frameworks

When it comes to testing, checking a single function is different from testing a complete application at once. It helps to understand the flaws in any units of the application and allows the developers to take appropriate steps. 

How unit

…
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6 Lessons Learned from Using Playwright for UI Tests

April 27, 2022June 7, 2022 Yonatan KraLeave a Comment on 6 Lessons Learned from Using Playwright for UI Tests

Here are 6 practical lessons learned from a production incident, ui-test coverage (using playwright) and code review.

Today we had a small incident in production – one of my teammates found out a feature in one of our component doesn’t …

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A woman looking at Jest on Canvas picture

How to test HTML5 canvas with jest?

August 4, 2021December 12, 2021 Yonatan KraLeave a Comment on How to test HTML5 canvas with jest?

In this short article you will learn what you need to install in order to prepare a test environment for canvas operations with jest. After finishing the article, you will be ready for some canvas testing action!

In the past …

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How to create a workspace coverage report in nrwl/nx monorepo?

February 6, 2021August 10, 2021 Yonatan Kra3 Comments on How to create a workspace coverage report in nrwl/nx monorepo?

This is going to be a short one. I’m using nrwl/nx a LOT. I’m also testing a LOT. Lately I needed to add a coverage report to one of my nrwl/nx repositories. The coverage tool I was using needed the …

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Musings about tests as documentation

January 16, 2021August 10, 2021 Yonatan KraLeave a Comment on Musings about tests as documentation

This post originated from a non-english post on Linkedin. Here’s a translation of the original post:

Yes, it’s very important to me that the systems I develop are covered by tests.

In this approach I trust that external libraries that

…
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Publishing a Web Components Library

April 1, 2019June 18, 2022 Yonatan KraLeave a Comment on Publishing a Web Components Library

Once upon a time, in order to create web components, one had to resort to a front end framework like angular or react (yes yes, I’ve heard the “it’s only a lib” before from all the angularists in the crowd) …

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