'Observe stdout from multiplatform kotlin commonTest code

I just want to see the output from a few simple println(...) in my Kotlin mulitplatform commonTest code. My build.gradle.kts looks a little like:

import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTarget

plugins {
    kotlin("multiplatform") version "1.3.61"
    kotlin("plugin.serialization") version "1.3.61"
}


kotlin {

   sourceSets {

        val commonMain by getting { ... }

        val commonTest by getting {
           dependencies {
              implementation("org.jetbrains.kotlin:kotlin-test-common")
              implementation("org.jetbrains.kotlin:kotlin-test-annotations-common")
           }
        }

        val jvmMain by getting { ... }

        val jvmTest by getting {
           dependencies {
              implementation(kotlin("test-junit"))
           }
        }

        // and so on ...

   }

}

Meanwhile in ~/src/commonTest/kotlin/my/company/library/CommonTest.kt:

package my.company.library

import kotlin.test.*

class CommonTest() {

   @Test
   fun testTrue() {
      println("Hello, test!")
      assertTrue(true)
   }

}

For the time being I'm running tests like this

./gradlew jvmTest

I want to see Hello, test! show up in the terminal. I don't mind typing a little extra on the command line.

Various answers around SO involving testLogging.showStandardStreams refer to the "standard" gradle test target, and I'm not sure how or if it actually interacts with the multiplatform test targets.

unit-testinggradlekotlinstdoutkotlin-multiplatform


Solution 1:[1]

You can make it work by adding this to your build.gradle.kts:

tasks.withType<Test> {
    testLogging {
        showStandardStreams = true
    }
}

Solution 2:[2]

Add the following to your gradle config:

iosTest {
    testLogging {
        events("PASSED", "FAILED", "SKIPPED")
        exceptionFormat = "full"
        showStandardStreams = true
        showStackTraces = true
    }
}

for JVM it would be similar but then under the block jvmTest.

Solution 3:[3]

In my case, this worked:

afterEvaluate {
    tasks.withType<AbstractTestTask> {
        testLogging {
            showStandardStreams = true
        }
    }
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Wilko
Solution 2 Werner Altewischer
Solution 3 BoD

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