Rewrite test-suites in kotlin

gradle/test-suites.gradle.kts

@@ -0,0 +1,79 @@
+import org.gradle.api.plugins.jvm.JvmTestSuite
+
+fun Project.addTestSuiteExtendingForDir(testSuiteName: String, parentSuiteName: String, dirName: String) {
+  testing {
+    suites {
+      create(testSuiteName, JvmTestSuite::class) {
+        sources {
+          java {
+            srcDirs("src/$dirName/java")
+          }
+          resources {
+            srcDirs("src/$dirName/resources")
+          }
+          if (project.plugins.hasPlugin("groovy")) {
+            groovy {
+              srcDirs("src/$dirName/groovy")
+            }
+          }
+          if (project.plugins.hasPlugin("org.jetbrains.kotlin.jvm")) {
+            kotlin {
+              srcDirs("src/$dirName/kotlin")
+            }
+          }
+          if (project.plugins.hasPlugin("scala")) {
+            scala {
+              srcDirs("src/$dirName/scala")
+            }
+          }
+        }
+      }
+    }
+  }
+
+  configurations {
+    val extendConf = { suffix: String ->
+      val config = named("${testSuiteName}${suffix}")
+      val parentConfig = named("${parentSuiteName}${suffix}")
+      if (parentConfig.isPresent) {
+        config.configure {
+          extendsFrom(parentConfig.get())
+        }
+      }
+
+      if (testSuiteName.matches(Regex(".*ForkedTest$"))) {
+        val nonForkedBaseConfName = testSuiteName.replaceFirst("Forked", "")
+        val nonForkedConfig = maybeCreate("${nonForkedBaseConfName}${suffix}")
+        config.configure {
+          extendsFrom(nonForkedConfig)
+        }
+      }
+    }
+
+    extendConf("CompileOnly")
+    extendConf("Implementation")
+    extendConf("RuntimeOnly")
+    extendConf("AnnotationProcessor")
+  }
+
+  tasks.register("${testSuiteName}Jar", Jar::class) {
+    dependsOn(tasks.named("${testSuiteName}Classes"))
+    from(sourceSets.named(testSuiteName).get().output)
+    archiveClassifier.set(testSuiteName)
+  }
+
+  // The project dependency definition cannot sit inside previous blocks. As of Gradle 8.8, configurations cannot be mutated after they have been used as part of the dependency graph.
+  // See: https://docs.gradle.org/current/userguide/upgrading_version_8.html#mutate_configuration_after_locking
+  // And related issue: https://github.com/gradle/gradle/issues/28867
+  dependencies {
+    add("${testSuiteName}Implementation", project(project.path))
+  }
+}
+
+fun Project.addTestSuiteForDir(testSuiteName: String, dirName: String) {
+  addTestSuiteExtendingForDir(testSuiteName, "test", dirName)
+}
+
+fun Project.addTestSuite(testSuiteName: String) {
+  addTestSuiteForDir(testSuiteName, testSuiteName)
+}