Added compatibility tests

demo-project-tests/build.gradle.kts

@@ -44,4 +44,4 @@ tasks.check {
     rootProject.allprojects {
         dependsOn(tasks.withType<CodeOwnersReportTask>())
     }
-}
+}

plugins/base-plugin/build.gradle.kts

@@ -2,6 +2,8 @@ plugins {
     alias(libs.plugins.kotlin.jvm)
     alias(libs.plugins.kotlin.samWithReceiver)
     alias(libs.plugins.gradle.pluginPublish)
+    `java-test-fixtures`
+    `plugin-compatibility-test`
     `maven-central-publish`
     jacoco
 }
@@ -24,8 +26,9 @@ dependencies {
     implementation(projects.matcher)
     implementation(libs.apache.bcel)
 
-    testImplementation(gradleTestKit())
-    testImplementation(libs.kotlin.test)
+    testFixturesImplementation(gradleTestKit())
+    testFixturesApi(platform(libs.junit.bom))
+    testFixturesApi("org.junit.jupiter:junit-jupiter-params")
 }
 
 gradlePlugin {
@@ -41,10 +44,6 @@ gradlePlugin {
     }
 }
 
-tasks.test {
-    workingDir(temporaryDir)
-}
-
 // makes sure to publish to mavenCentral first, before doing it to Plugins Portal
 tasks.publishPlugins {
     mustRunAfter(tasks.publishToSonatype)

plugins/base-plugin/src/compatibilityTest/kotlin/io/github/gmazzo/codeowners/CodeOwnersPluginCompatTest.kt

@@ -0,0 +1,3 @@
+package io.github.gmazzo.codeowners
+
+class CodeOwnersPluginCompatTest : CodeOwnersBaseCompatTest("io.github.gmazzo.codeowners")

plugins/base-plugin/src/testFixtures/kotlin/io/github/gmazzo/codeowners/CodeOwnersBaseCompatTest.kt

@@ -0,0 +1,119 @@
+package io.github.gmazzo.codeowners
+
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.params.ParameterizedTest
+import org.junit.jupiter.params.provider.EnumSource
+import java.io.File
+
+abstract class CodeOwnersBaseCompatTest(
+    private val pluginId: String,
+) {
+
+    @Suppress("EnumEntryName")
+    enum class Kind(val kotlin: Boolean, val android: Boolean) {
+        alone(false, false),
+        withKotlin(true, false),
+        withAndroid(false, true),
+        withBoth(true, true)
+    }
+
+    @ParameterizedTest(name = "{0}")
+    @EnumSource(Kind::class)
+    open fun `plugin can be applied with given classpath`(kind: Kind) {
+        val rootDir = File(kind.name)
+        rootDir.deleteRecursively()
+        rootDir.mkdirs()
+
+        val plugins = when (kind) {
+            Kind.alone -> "java"
+            Kind.withKotlin -> "id(\"org.jetbrains.kotlin.jvm\")"
+            Kind.withAndroid -> "id(\"com.android.application\")"
+            Kind.withBoth -> """
+                id("com.android.application")
+                id("org.jetbrains.kotlin.android")
+            """.trimIndent()
+        }
+
+        val buildFile = File(rootDir, "build.gradle.kts")
+        buildFile.writeText(
+            """
+            plugins {
+                $plugins
+                id("$pluginId")
+            }
+           
+            configurations.all {
+                exclude("io.github.gmazzo.codeowners", "jvm-core")
+                exclude("io.github.gmazzo.codeowners", "kotlin-core")
+            }
+            """.trimIndent()
+        )
+
+        if (kind.android) {
+            buildFile.appendText(
+                """
+                
+                android {
+                    namespace = "org.test"
+                    compileSdk = 30
+                    defaultConfig {
+                        minSdk = 21
+                        targetSdk = 30
+                    }
+                }
+                """.trimIndent()
+            )
+
+            File(rootDir, "src/main/AndroidManifest.xml")
+                .apply { parentFile.mkdirs() }
+                .writeText("<manifest/>")
+        }
+
+        File(rootDir, "settings.gradle.kts").writeText(
+            """
+            pluginManagement {
+                repositories {
+                    gradlePluginPortal()
+                    mavenCentral()
+                    google()
+                }
+            }
+            dependencyResolutionManagement {
+                repositories {
+                    mavenCentral()
+                    google()
+                }
+            }
+            
+            rootProject.name = "test"
+            
+            include(":app")
+            """.trimIndent()
+        )
+
+        File(rootDir, "CODEOWNERS").createNewFile()
+
+        val build = GradleRunner.create()
+            .withProjectDir(rootDir)
+            .withPluginClasspath("/$kind.classpath")
+            .withArguments("codeOwnersReport", "-s")
+            .build()
+
+        assertEquals(
+            if (kind.android) TaskOutcome.SUCCESS else TaskOutcome.NO_SOURCE,
+            build.task(":codeOwnersReport")?.outcome
+        )
+    }
+
+    fun GradleRunner.withPluginClasspath(fromResource: String) = apply {
+        withPluginClasspath(
+            javaClass.getResource(fromResource)!!.readText()
+                .splitToSequence(File.pathSeparatorChar)
+                .map(::File)
+                .toList()
+        )
+    }
+
+}

plugins/build.gradle.kts

@@ -21,6 +21,15 @@ nexusPublishing {
 allprojects {
     group = "io.github.gmazzo.codeowners"
 
+    plugins.withId("jvm-test-suite") {
+        the<TestingExtension>().suites.withType<JvmTestSuite> {
+            useKotlinTest(libs.versions.kotlin)
+            dependencies {
+                implementation(platform(libs.junit.bom))
+            }
+        }
+    }
+
     plugins.withId("jacoco") {
         val jacocoTasks = tasks.withType<JacocoReport>()
 

plugins/buildSrc/build.gradle.kts

@@ -1,16 +1,22 @@
 plugins {
     `kotlin-dsl`
+    alias(libs.plugins.buildConfig)
 }
 
 repositories {
     gradlePluginPortal()
 }
 
-dependencies {
-    fun plugin(dep: Provider<PluginDependency>) = with(dep.get()) {
-        create("$pluginId:$pluginId.gradle.plugin:$version")
-    }
+fun plugin(dep: Provider<PluginDependency>) = dep.map {
+    "${it.pluginId}:${it.pluginId}.gradle.plugin:${it.version}"
+}
 
+dependencies {
     implementation(plugin(libs.plugins.buildConfig))
     implementation(plugin(libs.plugins.dokka))
 }
+
+buildConfig {
+    buildConfigField("KOTLIN_PLUGIN", plugin(libs.plugins.kotlin.jvm))
+    buildConfigField("ANDROID_PLUGIN", plugin(libs.plugins.android.application))
+}

plugins/buildSrc/src/main/kotlin/plugin-compatibility-test.gradle.kts

@@ -0,0 +1,75 @@
+import buildSrc.BuildConfig
+
+plugins {
+    `java-gradle-plugin`
+}
+
+val compatibilityTest by testing.suites.registering(JvmTestSuite::class) {
+    dependencies {
+        implementation(testFixtures(project(":base-plugin")))
+    }
+    targets.configureEach {
+        testTask.configure {
+            javaLauncher = javaToolchains.launcherFor { languageVersion = JavaLanguageVersion.of(17) }
+            workingDir(temporaryDir)
+        }
+    }
+}
+
+val compatibilityTestSelfPlugin by configurations.creating
+val compatibilityTestKotlinPlugin by configurations.creating
+val compatibilityTestAndroidPlugin by configurations.creating
+
+dependencies {
+    compatibilityTestSelfPlugin(project)
+    compatibilityTestKotlinPlugin(BuildConfig.KOTLIN_PLUGIN)
+    compatibilityTestAndroidPlugin(BuildConfig.ANDROID_PLUGIN)
+}
+
+val collectPluginMetadata by tasks.registering(CollectDependencies::class) {
+    aloneClasspath.from(compatibilityTestSelfPlugin)
+    kotlinClasspath.from(compatibilityTestSelfPlugin, compatibilityTestKotlinPlugin)
+    androidClasspath.from(compatibilityTestSelfPlugin, compatibilityTestAndroidPlugin)
+    bothClasspath.from(compatibilityTestSelfPlugin, compatibilityTestKotlinPlugin, compatibilityTestAndroidPlugin)
+    outputDirectory.set(temporaryDir)
+}
+
+sourceSets.named(::compatibilityTest.name) {
+    resources.srcDirs(collectPluginMetadata)
+}
+
+tasks.check {
+    dependsOn(compatibilityTest)
+}
+
+@CacheableTask
+abstract class CollectDependencies : DefaultTask() {
+
+    @get:Classpath
+    abstract val aloneClasspath: ConfigurableFileCollection
+
+    @get:Classpath
+    abstract val kotlinClasspath: ConfigurableFileCollection
+
+    @get:Classpath
+    abstract val androidClasspath: ConfigurableFileCollection
+
+    @get:Classpath
+    abstract val bothClasspath: ConfigurableFileCollection
+
+    @get:OutputDirectory
+    abstract val outputDirectory: DirectoryProperty
+
+    @TaskAction
+    fun generateResources() {
+        val outDir = outputDirectory.get().asFile
+        outDir.deleteRecursively()
+        outDir.mkdirs()
+
+        File(outDir, "alone.classpath").writeText(aloneClasspath.asPath)
+        File(outDir, "withKotlin.classpath").writeText(kotlinClasspath.asPath)
+        File(outDir, "withAndroid.classpath").writeText(androidClasspath.asPath)
+        File(outDir, "withBoth.classpath").writeText(bothClasspath.asPath)
+    }
+
+}

plugins/jvm-core/build.gradle.kts

@@ -9,13 +9,6 @@ description = "CodeOwners Library"
 
 java.toolchain.languageVersion.set(JavaLanguageVersion.of(8))
 
-testing.suites.withType<JvmTestSuite> {
-    useKotlinTest(libs.versions.kotlin)
-    dependencies {
-        implementation(platform(libs.junit.bom))
-    }
-}
-
 publishing.publications {
     create<MavenPublication>("java") { from(components["java"]) }
 }

plugins/jvm-plugin/build.gradle.kts

@@ -5,6 +5,7 @@ plugins {
     alias(libs.plugins.kotlin.samWithReceiver)
     alias(libs.plugins.gradle.pluginPublish)
     com.github.gmazzo.buildconfig
+    `plugin-compatibility-test`
     `maven-central-publish`
     jacoco
 }
@@ -28,22 +29,16 @@ dependencies {
     implementation(projects.matcher)
 
     testImplementation(gradleKotlinDsl())
+    testImplementation(testFixtures(projects.basePlugin))
+
     testRuntimeOnly(plugin(libs.plugins.kotlin.jvm))
 
     pluginUnderTestImplementation(plugin(libs.plugins.android.application))
     pluginUnderTestImplementation(plugin(libs.plugins.kotlin.jvm))
 }
 
-testing.suites.withType<JvmTestSuite> {
-    useKotlinTest(libs.versions.kotlin)
-    dependencies {
-        implementation(platform(libs.junit.bom))
-    }
-    targets.all {
-        testTask {
-            workingDir(provider { temporaryDir })
-        }
-    }
+tasks.test {
+    workingDir(temporaryDir)
 }
 
 gradlePlugin {

plugins/jvm-plugin/src/compatibilityTest/kotlin/io/github/gmazzo/codeowners/CodeOwnersJVMPluginCompatTest.kt

@@ -0,0 +1,3 @@
+package io.github.gmazzo.codeowners
+
+class CodeOwnersJVMPluginCompatTest : CodeOwnersBaseCompatTest("io.github.gmazzo.codeowners.jvm")