kotlin VS Kotest

### Curated list of people blogging and vlogging about Kotlin (with links) - Roman Elizarov — https://medium.com/@elizarov - Jake Wharton — https://jakewharton.com/ - Marcin Moskala (Kotlin Academy) — https://blog.kotlin-academy.com/ - Gábor Varadi (Zhuinden) — https://zhuinden.medium.com/ - Antonio Leiva — https://antonioleiva.com/ • YouTube: https://www.youtube.com/@AntonioLeiva - Donn Felker — https://www.donnfelker.com/ - Kaushik Gopal — https://kaush.co/ - Nate Ebel (Goobar) — YouTube: https://www.youtube.com/@Goobar - Rahul Pandey — YouTube: https://www.youtube.com/@rahulpn7 - Philipp Lackner — YouTube: https://www.youtube.com/@PhilippLackner • Site: https://pl-coding.com/ - Stevdza-San — YouTube: https://www.youtube.com/@StevdzaSan - Reso Coder — https://resocoder.com/ • YouTube: https://www.youtube.com/@ResoCoder - Code With Mitch (Mitch Tabian) — https://codewithmitch.com/ • YouTube: https://www.youtube.com/@mitchtabian - Igor Wojda — https://medium.com/@igorwojda - Alexey Soshin — https://soshin.dev/ - Kevin Galligan — https://kevingalligan.com/ • Company blog: https://touchlab.co/blog - John O’Reilly — https://johnoreilly.dev/ - Rick Clephas — https://rickclephas.com/ - Arkadii Ivanov — https://arkivanov.github.io/ ### Official channels and team sources (Kotlin-heavy) - Kotlin by JetBrains (talks, news) — YouTube: https://www.youtube.com/@Kotlin - JetBrains Kotlin Blog — https://blog.jetbrains.com/kotlin/ - Kotlinlang Blog — https://kotlinlang.org/blog - Talking Kotlin (podcast) — https://kotlinlang.org/podcast - Android Developers (Kotlin-first Android) — Blog: https://android-developers.googleblog.com • YouTube: https://www.youtube.com/c/AndroidDevelopers

All code examples in this article are written in Kotlin, leveraging its concise syntax, null safety, and seamless Java interoperability. Kotlin's expressive language features make the implementation more readable and maintainable compared to traditional Java approaches, while providing full compatibility with the Spring Boot ecosystem.

I've never heard of language lock in. The source is here: https://github.com/JetBrains/kotlin

Come in; the water is fine.

Doodle helps you create beautiful, modern apps entirely in Kotlin. Its render model is intuitive yet powerful, making it easy to achieve complex UIs with pixel level precision and layouts. This simplicity and power applies to everything from user input to drag and drop. Doodle lets you build and animate anything.

5. Kotlin: The Modern Java Alternative

Kotlin Official Website

Kotlin Official Website: Your one-stop shop for all things Kotlin, with comprehensive documentation, tutorials, and resources: https://kotlinlang.org/

Next, I selected the technologies and frameworks I want to focus on during this challenge. For frontend development, I'll be exploring Reactjs, Vue.js, Bootstrap, Next.js, and MUI. For backend development, I'll be diving into Express, Django, Node.js, PHP, and Firebase. Additionally, I'll be learning Kotlin, React Native, and Flutter for mobile development, and APIs, PostgreSQL, Cloud, and MongoDB for full stack projects.

Kotest - Testing framework

As you might know, Advent of Code will begin this Friday! If, like me, you want to have a go at solving the puzzles in Kotlin, I would like to share with you a little library I've developed to reduce boilerplate and solve the puzzles in a test-driven approach. It is based on Kotest, a modern and Kotlin-first test framework.

Kotlin testing with Kotest and MockK

As a matter of fact, in the previous examples, we have shifted a bit away from the TDD standards in the meaning that we test not only the operability of our code, but rather check if the code runs according to certain specifications (Given/When/Then). These specifications are our tests, and the syntactic sugar in the form of the possibility to give clear names to the tests using DisplayName and the grouping of the tests by a set of similar attributes helps us clearly formulate these specifications. There is an entire family of frameworks in different languages that allow us to create such specifications: for Java it is Spock, for Ruby—RSpec, and for Kotlin—Spek and Kotest frameworks. Below, I will go into more detail about them.

I've tried so many times. SO MANY. I love the idea of mutation testing. Even chatGPT couldn't help me. It just made up fake mutation testing frameworks to try. To me, pitest is dead. kotest is not mutation testing, but it's property testing is the next best thing I have found to revolutionize your unit tests.

The extensions are not particularly useful in this scenario because the described functionality can be incorporated into the Host class. On the other hand, they flourish in test frameworks like Kotest and enable the rapid development of useful add-ons like custom matchers. Extending third-party libraries with utility functions is another prevalent use case. In the next sections, we'll zero in on this specific aspect.

We're using Kotest for our unit tests and are quite happy with it.

Basic testing in Kotlin with Kotest built for kotlin specificatlly (upcoming)