add test

Author: pjfanning

actor-tests/src/test/scala-jdk21-only/org/apache/pekko/util/RandomNumberGeneratorJava21Spec.scala

@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.pekko.util
+
+import com.typesafe.config.ConfigFactory
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.wordspec.AnyWordSpec
+
+class RandomNumberGeneratorJava21Spec extends AnyWordSpec with Matchers {
+
+  "RandomNumberGenerator (Java 21+)" should {
+
+    "support config" in {
+      val config = ConfigFactory.parseString(
+        """pekko.random.generator.generator-implementation = "Xoroshiro128PlusPlus"""")
+      val rng = RandomNumberGenerator.createGenerator(config)
+      rng shouldBe a[Jep356RandomNumberGenerator]
+      rng.nextInt(10) should (be >= 0 and be < 10)
+    }
+
+  }
+}

actor-tests/src/test/scala/org/apache/pekko/util/RandomNumberGeneratorSpec.scala

@@ -25,7 +25,9 @@ class RandomNumberGeneratorSpec extends AnyWordSpec with Matchers {
   "RandomNumberGenerator" should {
 
     "default to ThreadLocalRandom" in {
-      RandomNumberGenerator.get() shouldEqual ThreadLocalRandomNumberGenerator
+      val rng = RandomNumberGenerator.get()
+      rng shouldEqual ThreadLocalRandomNumberGenerator
+      rng.nextInt(10) should (be >= 0 and be < 10)
     }
 
   }

actor/src/main/scala/org/apache/pekko/util/RandomNumberGenerator.scala

@@ -53,7 +53,7 @@ private[pekko] object ThreadLocalRandomNumberGenerator extends RandomNumberGener
  * INTERNAL API
  */
 @InternalApi
-private[pekko] class Jep356RandomNumberGenerator(impl: String) extends RandomNumberGenerator {
+private[pekko] final class Jep356RandomNumberGenerator(impl: String) extends RandomNumberGenerator {
 
   // https://openjdk.org/jeps/356