Jvm-test-suite - create common test sources for use in multiple test suites

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1

Using the jvm-test-suite gradle plugin, I would like to be able to create a common test source set for use in other test suites. I envision the structure to look like the following where the sources and resources from common can be used in unit, integration, functional, and performance:

project/
├─ src/
│  ├─ main/
│  ├─ test/
│  │  ├─ commonTest/
│  │  │  ├─ kotlin/
│  │  │  ├─ resources/
│  │  ├─ unitTest/
│  │  │  ├─ kotlin/
│  │  │  ├─ resources/
│  │  ├─ integrationTest/
│  │  │  ├─ kotlin/
│  │  │  ├─ resources/
│  │  ├─ functionalTest/
│  │  │  ├─ kotlin/
│  │  │  ├─ resources/
│  │  ├─ performanceTest/
│  │  │  ├─ kotlin/
│  │  │  ├─ resources/

So far I have tried the following, which I thought would provide the proper classpaths for each test suite:

@file:Suppress("UnstableApiUsage")

plugins {
    `jvm-test-suite`
}

// Register `commonTest` source set
sourceSets {
    register("commonTest") {
        java {
            compileClasspath += named("main").get().output
            runtimeClasspath += named("main").get().output
            srcDir("src/test/commonTest/kotlin")
        }
        resources {
            srcDir("src/test/commonTest/resources")
        }
    }
}

// Make `commonTestImplementation` extend from `testImplementation` so that we can use all dependencies that `testImplementation` uses
val commonTestImplementation by configurations.getting {
    extendsFrom(configurations.named("testImplementation").get())
}

configure<TestingExtension> {
    suites {
        val sourceSetMain = sourceSets.named("main").get()
        val sourceSetCommon = sourceSets.named("commonTest").get()

        // These might be able to just be variables instead of lazy evaluation
        val sourceSetMainClasspath = { sourceSetMain.compileClasspath + sourceSetMain.output }
        val sourceSetCommonClasspath = { sourceSetMain.compileClasspath + sourceSetMain.output }

        val test by getting(JvmTestSuite::class) {
            testType.set(TestSuiteType.UNIT_TEST)
            sources {
                // Add common test compile classpath and outputs to the `unitTest` suite?
                compileClasspath += sourceSetCommonClasspath()
                runtimeClasspath += output + compileClasspath
                java {
                    setSrcDirs(listOf("src/test/unitTest/kotlin"))
                    // I've also tried the following which only works when applied to only 1 test suite but not all. Same with the commented out resources portion directly below
                    // setSrcDirs(listOf("src/test/unitTest/kotlin", sourceSetCommon.java.srcDirs))
                }
                resources {
                    setSrcDirs(listOf("src/test/unitTest/resources"))
                    // setSrcDirs(listOf("src/test/unitTest/resources", sourceSetCommon.resources.srcDirs))
                }
            }
        }

        val functionalTest by registering(JvmTestSuite::class) {
            testType.set(TestSuiteType.FUNCTIONAL_TEST)
            dependencies {
                implementation(project())
            }
            sources {
                // Add common test compile classpath and outputs to the `unitTest` suite?
                compileClasspath += sourceSetCommonClasspath()
                runtimeClasspath += output + compileClasspath
                java {
                    setSrcDirs(listOf("src/test/functionalTest/kotlin"))
                }
                resources {
                    setSrcDirs(listOf("src/test/functionalTest/resources"))
                }
            }

            targets {
                all {
                    testTask.configure {
                        shouldRunAfter(test)
                    }
                }
            }
        }
    }
}

val functionalTestImplementation by configurations.getting {
    extendsFrom(configurations.named("testImplementation").get())
}

From this, I expect to be able to access common test sources in both the unit test (unitTest) directory and functional test (functionalTest) directory. However, this does not work as expected. Any thoughts/input are greatly appreciated!