Kotlin (JS) and unit-testing

JavaScript
1

Hi there!

We have written two rich GUI applications using Kotlin and in-house web framework. So far we have managed without writing any unit-tests (thanks to the fact that Kotlin is such a great language), but they are sometimes greatly missed.

Is there anyone who knows a way to unit-test Kotlin code, without writing the tests in pure JS against Kotlin-generated JS?

1 Like
2

For sure you can use Karma and kotlin’s built-in qunit support. Works well with Maven 1.0.x and gradle plugin 1.1 latest snapshots. Which one do you use?

4

Hi Sergey and thanks for a promising answer :slight_smile:

I’m using Maven 3 and the kotlin-maven-plugin and Kotlin 1.0.5.

Do you mean that this only works with upcoming Kotlin 1.1?

5

Is there any examples of how to do this? I’ve been looking around without finding any.

6

Yes, there is. See here: https://github.com/Kotlin/kotlinx.html/tree/master/js

It works with 1.0.x as well

1 Like
7

Thanks so much! I will look at it soon.

8

Hi again! I’ve now finally started to test this out.

I’m now using Kotlin 1.0.6

I’ve created test code under src/test/kotlin and have karma setup files in src/test/karma, as in your kotlinx project.

The tests run, when I use maven, however when I try to compile the project through intelliJ, then the compiler does not recognise references to code in src/main/kotlin (production code) in the src/test/kotlin (test code).

Would you know what’s wrong? Known problem?

I also noticed that you’re kotlinx project does not compile in IntelliJ either (only using maven). Is that a known problem too? Or a setup problem on my side?

Thanks,
Jørund

9

After struggling a lot with this (and not owning IntelliJ Ultimate Edition, so I can’t use test-runners like Karma), I finally gave up and made a very hacky solution: I now use a Junit5 dynamic test that calls qunit-cls on the compiled tests and parses it’s output:

https://gist.github.com/fab1an/02a8f241509971ee20958c1d97705565

10

Here is a working example using IntelliJ community + Gradle + QUnit:
https://github.com/epabst/kotlin-showcase/tree/master/webclient

Here is a working example using IntelliJ community + Maven + JUnit and QUnit: