I am not familiar with testing So I want to learn more in de

Question

I am not familiar with testing So I want to learn more in depth about this For that I need help and guidance Note I am doing tests with Kotlin for the first time I have not done testing in other languages before This is what I know What I have already done I have followed this I have seen few blogs on Mockk an Mokito I have seen that JUnit is present in Gradle project by default Problems when to use what why to choose one over the other cannot understand how to customize related stuff in the IDEA IDE etc

CLOVIS · Answer

Welcome to the world of testing Many approaches exist and no one agrees on which are the best When it comes to test frameworks for Kotlin my experience is that the only two viable options are either `kotlin test` recommended by JetBrains JUnit style or < CT0G9SD7Z|kotest> much much more powerful and feature complete I recommend you start by learning these two In my opinion the best explanation of test doubles mocks is this as well as this of the benefits of mocks Note that not everyone agrees mocks are a good idea but almost everyone agrees that mocks used just because everyone else uses mocks is actively harmful to your codebase The golden rules of testing are a test failure should be as close to a bug report as you can get it to reading the error message should tell you exactly what is broken and what needs to be fixed a test should fail for a specific reason if a function can fail for 9 reasons it should have 9 tests for failures + at least one test for the case where everything goes well most tests should test very specific things and a lot less tests should be used to test complete scenarios it is very important that if one thing changes with your software a very few number of tests fail those related to what you change The more tests break when you change things that aren t related to them the more tests will feel like a chore on the opposite if a single test fails per change you re sure that your change doesn t impact anything else and is thus safe for deploying

Dron Bhattacharya · Answer

I was having another problem I am not able to configure Gradle as I mostly rely on the project generated by the IDEA I don t even understand what to configure and why I was going through the Kotest website and felt like I should be knowing more about Gradle Can you refer me any resource for this purpose

Dron Bhattacharya · Answer

<https kotest io docs framework testing styles html> And I read this So before I write any test is there any theoretical aspect I have to learn

CLOVIS · Answer

Ahah I had the same problem Which platforms are you targetting

Dron Bhattacharya · Answer

Are you talking in Gradle context

CLOVIS · Answer

At the start of your build gradle file which Kotlin plugin are you using `kotlin jvm ` `kotlin js ` `kotlin multiplatform ` etc

CLOVIS · Answer

Or are you starting a new project from scratch

CLOVIS · Answer

In any case I recommend starting to play with Kotest using one of their example repositories <https github com orgs kotest repositories q=example amp type=all amp language= amp sort=> This way you re sure everything is configured well and you can take inspiration from the configuration later when you start using it in a real project

Dron Bhattacharya · Answer

< CLOVIS> `kotlin jvm ` and `kotlin multiplatform ` I think I don t know detailed difference between the two But this is what I want to achieve in long term At first I want to be capable of developing cli tools like git gradle vim Then I want to be capable of developing Desktop Utility apps like PowerToy Also I want to do server side programming I have experience in Node js and Express js kind of frameworks mainly JavaScript and python background But I don t have any prior familiarity with `tests`

Dron Bhattacharya · Answer

My build gradle file from a practice project ``` This file was generated by the Gradle init task This generated file contains a sample Kotlin application project to get you started For more details take a look at the Building Java amp JVM projects chapter in the Gradle User Manual available at <https docs gradle org 8 0 userguide building java projects html> plugins Apply the org jetbrains kotlin jvm Plugin to add support for Kotlin id org jetbrains kotlin jvm version 1 8 10 Apply the application plugin to add support for building a CLI application in Java application repositories Use Maven Central for resolving dependencies mavenCentral dependencies Use the Kotlin JUnit 5 integration testImplementation org jetbrains kotlin kotlin test junit5 Use the JUnit 5 integration testImplementation org junit jupiter junit jupiter engine 5 9 1 This dependency is used by the application implementation com google guava guava 31 1 jre implementation com github ajalt clikt clikt 3 5 1 testImplementation org junit jupiter junit jupiter 5 8 1 application Define the main class for the application mainClass set taskmanner AppKt tasks named lt Test gt test Use JUnit Platform for unit tests useJUnitPlatform ``` this is generated by `gradle init`

CLOVIS · Answer

First you can t add multiple `kotlin ` plugins in a single Gradle project `build gradle kts` You should choose one JVM creates a Java library or application meaning it will need the user to install Java to run It s the easiest to get started because it s the oldest so they had the time to fix most issues with it For CLI tools it s not great because the JVM is a bit slow to start ~0 3 0 5 seconds depending on your machine but it s still by far the best way to make your first attempt JS is for websites or other JS scripts You need a JavaScript executor to run it a web browser or NodeJS I guess you could create a NodeJS script like this but I do not recommend it if you re not very familiar with NodeJS already Plus Node is slower than the JVM Native is for native apps or libraries that do not need anything else to run on your machine It s the youngest platform by far and the hardest to use However it s the best platform for CLI apps so I recommend you make your first one or two on top of the JVM to understand how to do it and then try using Native Multiplatform is all of them It s the plugin to use when you want to create a single app that runs on multiple platforms It s harder to configure so I don t recommend starting with it but it s by far the most interesting in my opinion

CLOVIS · Answer

Yep your setup looks good for a JVM project I recommend you use it to get familiar with Kotlin so you can attempt something else later If you have trouble with Kotest specifically you can ask in < CT0G9SD7Z|kotest>

Dron Bhattacharya · Answer

Is there anything to explore in the gradle setup from a customization prospective

Humphrey · Answer

I usually work with spring boot and I generate my gradle projects from <http start spring io|start spring io> website You can start building and running without much knowledge of gradle

Marit van Dijk · Answer

If you use IntelliJ IDEA Ultimate you can do this from the IDE the Spring support is integrated