Okay, finally i solve this problem. What i do:

libs.toml:

kotlinx-coroutines = "1.10.1" kotlinx-coroutines-test = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-test", version.ref = "kotlinx-coroutines" }

gradle:

implementation(libs.kotlinx.coroutines.test)

main.kt(desktop app):

Dispatchers.setMain(Dispatchers.Swing)