Is there a good quality guide on how to actually setup unit testing in Kotlin/JS for a multiplatform...

# multiplatform

[CLOVIS]

Is there a good quality guide on how to actually setup unit testing in Kotlin/JS for a multiplatform library? I've been following SO answers & stuff but the best I could find is 2 years old and very imprecise.

[russhwolf]

Is it not working for you out-of-the-box? JS updates since 1.3.40 changed the plugin setup significantly so a lot of stuff is there by default now. Probably just need a browser() or nodejs() call in your js{} target block.

[russhwolf]

For docs, multiplatform setup isn't very different from the js-specific setup in https://kotlinlang.org/docs/reference/js-project-setup.html, except you do your js stuff in js instead of target and your dependencies move to the standard mpp location instead of top-level

[Jeff]

@russhwolf I am trying to do testing with coroutines in JS.

internal actual fun <T> runTest(block: suspend () -> T): dynamic {
    return promise { block() }
}

promise isn't being resolved. Should I add a library?

[russhwolf]

For coroutine testing in js there's a setup descrubed in this youtrack ticket: https://youtrack.jetbrains.com/issue/KT-22228

[russhwolf]

Oh that's what you're doing

[russhwolf]

Not sure off-hand why that wouldn't work for you but make sure you have the kotlinx.coroutines dependencies added correctly

[Jeff]

Yes I do. This is my gradle
https://github.com/jeffnyauke/Mpesa-Kotlin-Multiplatform/blob/master/build.gradle.kts

[russhwolf]

the js stuff is all commented-out there

[russhwolf]

and you'll need kotlinx-coroutines-core-js in your js sources when you uncomment it

[Jeff]

Sorry. Check it again. I've pushed the latest code. It's not working even with that dependency.

[russhwolf]

You need core-js, not core-common

[russhwolf]

We've also drifted way off of the original thread here. Sorry Clovis

[Jeff]

val jsTest by getting {
    dependencies {
        implementation(kotlin("test-js"))

        api("io.ktor:ktor-client-mock-js:$ktorVersion")
        api("org.jetbrains.kotlinx:kotlinx-coroutines-core-js:$coroutinesVersion")
    }
}

Its core-js

[Jeff]

The only promise that comes up is Promise with capital P. But the one I am trying to use is small p

[russhwolf]

I'm not sure then. Sorry.

[CLOVIS]

Thanks a lot @russhwolf, I didn't realize you could do that... Glad the ecosystem is becoming so simple!

[Jeff]

Thanks. Got it to work!

import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.promise

internal actual fun <T> runTest(block: suspend () -> T): dynamic {
    return GlobalScope.promise { block() }
}