Using kotest, this test fails on JavaScript with K...

# kotest

[rocketraman]

Using kotest, this test fails on JavaScript with Kotlin 1.9.20 with a TypeError, but note if mapOf is changed to listOf it works. Also note, if I use kotlin.test instead of kotest, the test passes as well. This is clearly a bug somewhere, but I'm trying to figure out whether its a kotlin/js bug, or whether its a kotest bug. Thoughts? More details in 🧵. Here is a repo to play with locally: https://github.com/rocketraman/test-kt-duration-in-map

class DurationKoTest : FunSpec({
  test("Duration in map") {
    val tests = mapOf(
      15.seconds to 0L,
    )

    tests.forEach { (input, output) ->
      input.toLong(DurationUnit.DAYS) shouldBe output
    }
  }
})

[rocketraman]

Incidentally, it fails with the k2 compiler as well, in exactly the same way

[rocketraman]

And here is the error:

TypeError: _get_rawValue__5zfu4e(...).shr_9fl3wl_k$ is not a function
	at <global>._get_value__a43j40(/home/raman/source/test-kt-duration-in-map/compileSync/js/test/testDevelopmentExecutable/kotlin/src/kotlin/time/Duration.kt:37)
	at <global>.Duration__toLong_impl_shr43i(/home/raman/source/test-kt-duration-in-map/compileSync/js/test/testDevelopmentExecutable/kotlin/src/kotlin/time/Duration.kt:789)
	at protoOf.doResume_5yljmg(/home/raman/source/test-kt-duration-in-map/src/commonTest/kotlin/DurationKotest.kt:13)
	at protoOf.invoke_s5vbtx(test-kt-duration-in-map-test.934710764.js:71230)
	at slambda.$test(test-kt-duration-in-map-test.934710764.js:71272)
	at protoOf.doResume_5yljmg(/runner/work/kotest/kotest/kotest-framework/kotest-framework-api/src/commonMain/kotlin/io/kotest/core/spec/style/scopes/RootScope.kt:36)
	at protoOf.invoke_s5vbtx(test-kt-duration-in-map-test.934710764.js:10912)
	at <global>.l(test-kt-duration-in-map-test.934710764.js:10959)
	at protoOf.doResume_5yljmg(/runner/work/kotest/kotest/kotest-framework/kotest-framework-engine/src/commonMain/kotlin/io/kotest/engine/test/TestCaseExecutor.kt:91)
	at protoOf.invoke_peurmw(test-kt-duration-in-map-test.934710764.js:28107)

[Casey Brooks]

It also seems to work fine when run in the Playground https://pl.kotl.in/aSU4yVRrM

Also, it seems like the test break when the Map.Entry is destructured, but works fine if you access the key/value properties normally

// this works
tests.forEach {
    val input = it.key
    val output = it.value
    input.toLong(DurationUnit.DAYS) shouldBe output
}

// this fails with the same error
tests.forEach { 
    val (input, output) = it
    input.toLong(DurationUnit.DAYS) shouldBe output
}

[Casey Brooks]

Is Kotest 5.8.0 used in the sample repo compiled with Kotlin 1.9.20? That might be the source of the issue, if it’s using a different version of the Kotlin stdlib

[rocketraman]

I believe its 1.8.10

[rocketraman]

Using 1.8.10 in the repo above works -- the test passes. I guess its not a bug then -- as I understand it, Kotlin/JS does not yet offer compat between versions. Scary failure mode though.

[Casey Brooks]

Yeah, I think JS is the only target which doesn’t really have any real ABI guarantees yet, and you basically need all libraries on the same minor version. Native uses its own klib format, and JVM has classfiles, which I guess are much easier to maintain binary compatibility for than compiled JS