Kotlin 多平台：kotlinx.coroutines.test 库在 commonTest 模块中不可见

Question

我在将 kotlin 协程测试框架 kotlinx.coroutines.test 与针对 Android（以及未来的 ios）的多平台项目集成时遇到了困难

我的通用代码严重依赖协程，但我无法测试它们（看起来测试库不在类路径中）

build.gradle 通用模块：

plugins {
    id 'org.jetbrains.kotlin.multiplatform'
    id 'com.android.library'
    id 'kotlin-kapt'
}

android {
    defaultConfig {
        compileSdkVersion 28
        javaCompileOptions.annotationProcessorOptions.includeCompileClasspath = true
    }
    lintOptions {
        checkAllWarnings true
    }
}

def coroutinesVersion = "1.3.0-M2"
def mockKVersion = "1.9.3"

kotlin {
    targets {
        fromPreset(presets.android, 'android')
    }

    sourceSets {
        commonMain.dependencies {
            //Kotlin
            implementation "org.jetbrains.kotlin:kotlin-stdlib-common:$kotlin_version"
            implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version" //used in Log implementation
            implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core-common:$coroutinesVersion"
        }
        commonTest.dependencies {
            //Kotlin
            implementation "org.jetbrains.kotlin:kotlin-test-common:$kotlin_version"
            implementation "org.jetbrains.kotlin:kotlin-test-annotations-common:$kotlin_version"
            //Coroutines testing
            implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core-common:$coroutinesVersion"
            implementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:$coroutinesVersion"
            implementation "io.mockk:mockk-common:$mockKVersion"
        }
        androidMain.dependencies {
            implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
            implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutinesVersion"
        }
        androidTest.dependencies {
            implementation "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
            implementation "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
            implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutinesVersion"
            implementation "io.mockk:mockk:$mockKVersion"
        }
    }
}

/*
* Due to the current limitations, it requires that the Android target is created before the kapt dependencies are configured,
* which needs to be done in a top-level dependencies { ... } block rather than within Kotlin source sets dependencies.
*/
dependencies {
    implementation 'javax.annotation:javax.annotation-api:1.3.2'
    kapt 'com.google.auto.factory:auto-factory:1.0-beta6@jar'
    compileOnly "com.google.auto.factory:auto-factory:1.0-beta6"
}

commonTest 源集中的示例测试：

package some.package.common.test

import kotlin.test.Test
import kotlin.test.assertTrue

class SomeTest {

    @Test
    fun `should pass`() {
        //none of the kotlinx.coroutines.test content is available here (eg. runBlockingTest)
        assertTrue { 2 + 2 == 4 }
    }
}

Answer 1

实际上，他们看起来像是fixed it。现在，您应该可以在 commonTest 中使用 kotlinx.coroutines.test。 据我所知，使用新的 Kotlin 1.6 版本，您应该能够使用 this 在共享的 KMM 代码中运行您的测试

Answer 2

原来kotlinx.coroutines.test是一个JVM库，所以不能在通用模块中使用。

可能的解决方案：

• 在 Android（或其他 JVM 兼容）模块中编写测试并使用库
• 定义您自己的通用函数，该函数将使用 JVM/Native 实现的 runBlocking（请参阅 https://youtrack.jetbrains.com/issue/KT-22228）

---

//TestUtil.kt in commonTest source set
expect fun runBlocking(block: suspend () -> Unit)

//TestUtil.kt in androidTest source set
actual fun runBlocking(block: suspend () -> Unit) = kotlinx.coroutines.runBlocking { block() }

//example usage in commonTest source set
class Test {
    @Test
    fun shouldPass() = runBlocking {
        assertTrue { 2 + 2 == 4 }
    }
}