Not clear checkModules instruction: Gradle Plugin fails with NPE

Describe the bug I found out very interesting feature — checkModules Gradle plugin from Koin. But unfortunately executing Gradle task “checkModules” leads to NPE. I’m sure the guide is not clear.

That’s the error:

C:\Development\Projects\Pet\Ubily>gradlew checkModules
Configuration on demand is an incubating feature.

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':checkModules'.
> java.lang.NullPointerException (no error message)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 693ms

To Reproduce

1. Define multimodule Android project.
2. Define Koin modules for each one.
3. Make sure it works correctly.
4. Apply next build.gradle file:

apply plugin: 'koin'

buildscript {
    ext.kotlin_version = '1.3.71'

    repositories {
        google ()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.koin:koin-gradle-plugin:2.1.5"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

1. Write JUnit Test:

@Category(CheckModuleTest::class)
class KoinModulesTest : KoinTest {

    @Test
    fun checkAllModules() = checkModules {
        modules(koinModules) // there are all modules of the project
    }

}

1. Then run command from Android Studio terminal: gradlew checkModules

Expected behavior Correct work of the command “checkModules”, without NPE.

Koin project used and used version (please complete the following information):

•   org.koin:koin-gradle-plugin:2.1.5
  

•   implementation "org.koin:koin-androidx-scope:2.1.5"
    implementation "org.koin:koin-androidx-viewmodel:2.1.5"
    testImplementation "org.koin:koin-test:2.1.5"

[kirich1409]

For Android projects to proper check DI graph, you need to run the test using Robolectric or run it on an Android device

[fmatosqg]

I think I found the reason, it may be because I have flavors on my sample module.

./gradlew checkAndroidModules . . . What went wrong: Could not determine the dependencies of task ‘:sample:checkAndroidModules’. Task with path ‘testDebugUnitTest’ not found in project ‘:sample’.

Sounds like a candidate for a separate issue, right?