[Gradle] Add an integration test for KT-59256

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt

@@ -1269,4 +1269,15 @@ open class Kapt3IT : Kapt3BaseIT() {
             }
         }
     }
+
+    @DisplayName("KT-59256: kapt generated files are included into the test runtime classpath")
+    @GradleTest
+    @Disabled("The fix is not yet provided")
+    fun testKaptGeneratedInTestRuntimeClasspath(gradleVersion: GradleVersion) {
+        project("kapt-in-test-runtime-classpath".withPrefix, gradleVersion) {
+            build("test") {
+                assertFileInProjectExists("build/tmp/kapt3/classes/main/META-INF/services/com.example.SomeInterface")
+            }
+        }
+    }
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/kapt-in-test-runtime-classpath/build.gradle

@@ -0,0 +1,16 @@
+plugins {
+    id("org.jetbrains.kotlin.jvm")
+    id("org.jetbrains.kotlin.kapt")
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version")
+    implementation("com.google.auto.service:auto-service:1.0-rc3")
+    kapt("com.google.auto.service:auto-service:1.0-rc3")
+    testImplementation'junit:junit:4.13.2'
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/kapt-in-test-runtime-classpath/src/main/kotlin/service.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package com.example
+
+import com.google.auto.service.AutoService
+import javax.annotation.processing.AbstractProcessor
+import javax.annotation.processing.Processor
+import javax.annotation.processing.RoundEnvironment
+import javax.lang.model.element.TypeElement
+import javax.tools.Diagnostic.Kind.MANDATORY_WARNING
+
+interface SomeInterface
+
+@AutoService(SomeInterface::class)
+class SomeService : SomeInterface

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kapt2/kapt-in-test-runtime-classpath/src/test/kotlin/test.kt

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package com.example
+
+import org.junit.Test
+import java.util.ServiceLoader
+
+class Tests {
+    @Test
+    fun testServiceLoading() {
+        ServiceLoader.load(SomeInterface::class.java).singleOrNull() ?: error("Cannot load SomeInterface implementation, perhaps the service declaration couldn't be found")
+    }
+}