hi! we’re trying to update our Multiplatform project to 1.9.0, and JS tests fail with ```TypeError a...

# kotest

[Alejandro Serrano Mena]

hi! we’re trying to update our Multiplatform project to 1.9.0, and JS tests fail with

TypeError at /Users/serras/arrow/arrow-libs/resilience/arrow-resilience/build/compileSync/js/test/testDevelopmentExecutable/kotlin/commonMainSources/libraries/stdlib/src/kotlin/time/Duration.kt:643

is there any known incompatibility with this version?

I’ve tried to use the latest Kotest snapshot, but without any success

[sam]

It's likely the 1.9 release broke things again with MPP.

[sam]

Every release tends to have something breaking since we're using compiler plugins which are experimental.

[sam]

I'll start on a 1.9 release (so Kotest 5.7.0) but it's likely to be 5-7 days away.

[Alejandro Serrano Mena]

that sounds great! 🙂 please let me know if I can be of any help

[Alejandro Serrano Mena]

do you prefer me to create an issue in the Kotest repo?

[Oliver.O]

Kotest on Kotlin 1.9 user here: I'm running a local build of Kotest at commit 3143993, which works like a charm. Could that TypeError be unrelated to Kotest?

[Alejandro Serrano Mena]

Kotest works for us in the rest of the modules, except those which use `Duration`…

[Oliver.O]

Hmm, this one worked for me:

import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.shouldBe
import kotlin.time.Duration
import kotlin.time.Duration.Companion.seconds

class DurationTest : FunSpec({
    test("one") {
        val totalDuration: Duration = 0.seconds
        totalDuration shouldBe 0.seconds
    }
})

[Oliver.O]

Test target was:

js {
        browser()
    }

Dependencies:

jsTestNpmAggregated - NPM configuration for compilation 'test' (target js (js)).
[...]
+--- org.jetbrains.kotlinx:kotlinx-datetime:{require 0.4.0; reject _} -> 0.4.0
|    \--- org.jetbrains.kotlinx:kotlinx-datetime-js:0.4.0
|         +--- org.jetbrains.kotlin:kotlin-stdlib-js:1.7.0 -> 1.9.0 (*)
|         +--- org.jetbrains.kotlinx:kotlinx-serialization-core:1.3.2 -> 1.5.1 (*)
|         \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.7.0 -> 1.9.0