Add receiveOne to TestProbe in Typed #25914 (#25994)

Add receiveOne to TestProbe in Typed (#25914)

akka-actor-testkit-typed/src/main/scala/akka/actor/testkit/typed/internal/EffectfulActorContext.scala

@@ -13,7 +13,7 @@ import akka.annotation.InternalApi
 import akka.actor.testkit.typed.Effect
 import akka.actor.testkit.typed.Effect._
 
-import scala.concurrent.duration.{ Duration, FiniteDuration }
+import scala.concurrent.duration.FiniteDuration
 import scala.reflect.ClassTag
 import scala.compat.java8.FunctionConverters._
 

akka-actor-testkit-typed/src/main/scala/akka/actor/testkit/typed/internal/TestProbeImpl.scala

@@ -4,7 +4,6 @@
 
 package akka.actor.testkit.typed.internal
 
-import java.time
 import java.util.concurrent.atomic.AtomicInteger
 import java.util.concurrent.{ BlockingDeque, LinkedBlockingDeque }
 import java.util.function.Supplier
@@ -132,7 +131,7 @@ private[akka] final class TestProbeImpl[M](name: String, system: ActorSystem[_])
     expectMessage(max.asScala, hint, obj)
 
   private def expectMessage_internal[T <: M](max: Duration, obj: T, hint: Option[String] = None): T = {
-    val o = receiveOne(max)
+    val o = receiveOne_internal(max)
     val hintOrEmptyString = hint.map(": " + _).getOrElse("")
     o match {
       case Some(m) if obj == m ⇒ m.asInstanceOf[T]
@@ -141,13 +140,21 @@ private[akka] final class TestProbeImpl[M](name: String, system: ActorSystem[_])
     }
   }
 
+  override def receiveOne(): M = receiveOne(remainingOrDefault)
+
+  override def receiveOne(max: java.time.Duration): M = receiveOne(max.asScala)
+
+  def receiveOne(max: FiniteDuration): M =
+    receiveOne_internal(max.dilated).
+      getOrElse(assertFail(s"Timeout ($max) during receiveOne while waiting for message."))
+
   /**
    * Receive one message from the internal queue of the TestActor. If the given
    * duration is zero, the queue is polled (non-blocking).
    *
    * This method does NOT automatically scale its Duration parameter!
    */
-  private def receiveOne(max: Duration): Option[M] = {
+  private def receiveOne_internal(max: Duration): Option[M] = {
     val message = Option(
       if (max == Duration.Zero) {
         queue.pollFirst
@@ -172,20 +179,20 @@ private[akka] final class TestProbeImpl[M](name: String, system: ActorSystem[_])
     expectNoMessage_internal(settings.ExpectNoMessageDefaultTimeout.dilated)
 
   private def expectNoMessage_internal(max: FiniteDuration): Unit = {
-    val o = receiveOne(max)
+    val o = receiveOne_internal(max)
     o match {
       case None    ⇒ lastWasNoMessage = true
-      case Some(m) ⇒ assertFail(s"received unexpected message $m")
+      case Some(m) ⇒ assertFail(s"Received unexpected message $m")
     }
   }
 
   override protected def expectMessageClass_internal[C](max: FiniteDuration, c: Class[C]): C = {
-    val o = receiveOne(max)
+    val o = receiveOne_internal(max)
     val bt = BoxedType(c)
     o match {
       case Some(m) if bt isInstance m ⇒ m.asInstanceOf[C]
-      case Some(m)                    ⇒ assertFail(s"expected $c, found ${m.getClass} ($m)")
-      case None                       ⇒ assertFail(s"timeout ($max) during expectMessageClass waiting for $c")
+      case Some(m)                    ⇒ assertFail(s"Expected $c, found ${m.getClass} ($m)")
+      case None                       ⇒ assertFail(s"Timeout ($max) during expectMessageClass waiting for $c")
     }
   }
 
@@ -193,7 +200,7 @@ private[akka] final class TestProbeImpl[M](name: String, system: ActorSystem[_])
     val stop = max + now
     for (x ← 1 to n) yield {
       val timeout = stop - now
-      val o = receiveOne(timeout)
+      val o = receiveOne_internal(timeout)
       o match {
         case Some(m) ⇒ m
         case None    ⇒ assertFail(s"timeout ($max) while expecting $n messages (got ${x - 1})")
@@ -204,7 +211,7 @@ private[akka] final class TestProbeImpl[M](name: String, system: ActorSystem[_])
   override protected def fishForMessage_internal(max: FiniteDuration, hint: String, fisher: M ⇒ FishingOutcome): List[M] = {
     @tailrec def loop(timeout: FiniteDuration, seen: List[M]): List[M] = {
       val start = System.nanoTime()
-      val maybeMsg = receiveOne(timeout)
+      val maybeMsg = receiveOne_internal(timeout)
       maybeMsg match {
         case Some(message) ⇒
           val outcome = try fisher(message) catch {

akka-actor-testkit-typed/src/main/scala/akka/actor/testkit/typed/javadsl/Effects.scala

@@ -7,7 +7,6 @@ package akka.actor.testkit.typed.javadsl
 import java.time.Duration
 
 import akka.actor.typed.{ ActorRef, Behavior, Props }
-import akka.actor.testkit.typed.Effect
 import akka.util.JavaDurationConverters._
 
 /**

akka-actor-testkit-typed/src/main/scala/akka/actor/testkit/typed/javadsl/TestProbe.scala

@@ -132,7 +132,8 @@ abstract class TestProbe[M] {
   @InternalApi protected def within_internal[T](min: FiniteDuration, max: FiniteDuration, f: ⇒ T): T
 
   /**
-   * Same as `expectMessage(remainingOrDefault, obj)`, but correctly treating the timeFactor.
+   * Same as `expectMessage(remainingOrDefault, obj)`, but using the
+   * default timeout as deadline.
    */
   def expectMessage[T <: M](obj: T): T
 
@@ -203,7 +204,8 @@ abstract class TestProbe[M] {
   // FIXME awaitAssert(Procedure): Unit would be nice for java people to not have to return null
 
   /**
-   * Same as `expectMessageType(clazz, remainingOrDefault)`, but correctly treating the timeFactor.
+   * Same as `expectMessageType(clazz, remainingOrDefault)`,but using the
+   * default timeout as deadline.
    */
   def expectMessageClass[T](clazz: Class[T]): T =
     expectMessageClass_internal(getRemainingOrDefault.asScala, clazz)
@@ -221,8 +223,18 @@ abstract class TestProbe[M] {
   @InternalApi protected def expectMessageClass_internal[C](max: FiniteDuration, c: Class[C]): C
 
   /**
-   * Same as `receiveN(n, remaining)` but correctly taking into account
-   * the timeFactor.
+   * Receive one message of type `M` within the default timeout as deadline.
+   */
+  def receiveOne(): M
+
+  /**
+   * Receive one message of type `M`. Wait time is bounded by the `max` duration,
+   * with an [[AssertionError]] raised in case of timeout.
+   */
+  def receiveOne(max: Duration): M
+
+  /**
+   * Same as `receiveMessages(n, remaining)` but using the default timeout as deadline.
    */
   def receiveMessages(n: Int): JList[M] = receiveN_internal(n, getRemainingOrDefault.asScala).asJava
 

akka-actor-testkit-typed/src/main/scala/akka/actor/testkit/typed/scaladsl/TestProbe.scala

@@ -105,7 +105,7 @@ object TestProbe {
   protected def within_internal[T](min: FiniteDuration, max: FiniteDuration, f: ⇒ T): T
 
   /**
-   * Same as `expectMessage(remainingOrDefault, obj)`, but correctly treating the timeFactor.
+   * Same as `expectMessage(remainingOrDefault, obj)`, but using the default timeout as deadline.
    */
   def expectMessage[T <: M](obj: T): T
 
@@ -140,7 +140,7 @@ object TestProbe {
   def expectNoMessage(): Unit
 
   /**
-   * Same as `expectMessageType[T](remainingOrDefault)`, but correctly treating the timeFactor.
+   * Same as `expectMessageType[T](remainingOrDefault)`, but using the default timeout as deadline.
    */
   def expectMessageType[T <: M](implicit t: ClassTag[T]): T =
     expectMessageClass_internal(remainingOrDefault, t.runtimeClass.asInstanceOf[Class[T]])
@@ -154,8 +154,18 @@ object TestProbe {
   protected def expectMessageClass_internal[C](max: FiniteDuration, c: Class[C]): C
 
   /**
-   * Same as `receiveN(n, remaining)` but correctly taking into account
-   * the timeFactor.
+   * Receive one message of type `M` within the default timeout as deadline.
+   */
+  def receiveOne(): M
+
+  /**
+   * Receive one message of type `M`. Wait time is bounded by the `max` duration,
+   * with an [[AssertionError]] raised in case of timeout.
+   */
+  def receiveOne(max: FiniteDuration): M
+
+  /**
+   * Same as `receiveN(n, remaining)` but using the default timeout as deadline.
    */
   def receiveN(n: Int): immutable.Seq[M] = receiveN_internal(n, remainingOrDefault)
 

akka-actor-testkit-typed/src/test/java/akka/actor/testkit/typed/javadsl/TestProbeTest.java

@@ -4,52 +4,54 @@
 
 package akka.actor.testkit.typed.javadsl;
 
-import akka.actor.typed.ActorRef;
-import akka.actor.typed.ActorSystem;
-
 import java.time.Duration;
 import java.util.List;
 
-public class TestProbeTest {
+import akka.actor.testkit.typed.scaladsl.TestProbeSpec;
+import akka.actor.testkit.typed.scaladsl.TestProbeSpec.*;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.scalatest.junit.JUnitSuite;
 
-  public static void compileOnlyApiTest() {
-    ActorSystem<Object> system = null;
-    TestProbe<String> probe = TestProbe.create(system);
-    probe.ref();
-    probe.awaitAssert(() -> {
-      // ... something ...
-      return null;
+import static org.junit.Assert.*;
+
+public class TestProbeTest extends JUnitSuite {
+
+  @ClassRule
+  public static TestKitJunitResource testKit = new TestKitJunitResource();
+
+  @Test
+  public void testReceiveOne() {
+    TestProbe<EventT> probe = TestProbe.create(testKit.system());
+
+    List<EventT> eventsT = akka.japi.Util.javaArrayList(TestProbeSpec.eventsT(10));
+
+    eventsT.forEach(e->{
+      probe.getRef().tell(e);
+      assertEquals(probe.receiveOne(), e);
     });
-    probe.awaitAssert(Duration.ofSeconds(3), () -> {
-      // ... something ...
-      return null;
-    });
-    String awaitAssertResult =
-      probe.awaitAssert(Duration.ofSeconds(3), Duration.ofMillis(100), () -> {
-        // ... something ...
-        return "some result";
-      });
-    String messageResult = probe.expectMessage("message");
-    String expectClassResult = probe.expectMessageClass(String.class);
+
     probe.expectNoMessage();
-
-    ActorRef<String> ref = null;
-    probe.expectTerminated(ref, Duration.ofSeconds(1));
-
-    Duration remaining = probe.getRemaining();
-    probe.fishForMessage(Duration.ofSeconds(3), "hint", (message) -> {
-      if (message.equals("one")) return FishingOutcomes.continueAndIgnore();
-      else if (message.equals("two")) return FishingOutcomes.complete();
-      else return FishingOutcomes.fail("error");
-    });
-
-    String withinResult = probe.within(Duration.ofSeconds(3), () -> {
-      // ... something ...
-      return "result";
-    });
-
-    List<String> messages1 = probe.receiveMessages(3);
-    List<String> messages2 = probe.receiveMessages(3, Duration.ofSeconds(5));
-
   }
+
+  @Test
+  public void testReceiveOneMaxDuration() {
+    TestProbe<EventT> probe = TestProbe.create(testKit.system());
+
+    List<EventT> eventsT = akka.japi.Util.javaArrayList(TestProbeSpec.eventsT(2));
+
+    eventsT.forEach(e->{
+      probe.getRef().tell(e);
+      assertEquals(probe.receiveOne(Duration.ofMillis(100)), e);
+    });
+
+    probe.expectNoMessage();
+  }
+
+  @Test(expected = AssertionError.class)
+  public void testReceiveOneFailOnTimeout() {
+    TestProbe<EventT> probe = TestProbe.create(testKit.system());
+    probe.receiveOne(Duration.ofMillis(100));
+  }
+
 }

akka-actor-testkit-typed/src/test/scala/akka/actor/testkit/typed/scaladsl/TestProbeSpec.scala

@@ -5,11 +5,15 @@
 package akka.actor.testkit.typed.scaladsl
 
 import akka.actor.typed.scaladsl.Behaviors
+import com.typesafe.config.ConfigFactory
+
 import scala.concurrent.duration._
 import org.scalatest.WordSpecLike
 
 class TestProbeSpec extends ScalaTestWithActorTestKit with WordSpecLike {
 
+  import TestProbeSpec._
+
   def compileOnlyApiTest(): Unit = {
     val probe = TestProbe[AnyRef]()
     probe.fishForMessage(100.millis) {
@@ -31,7 +35,6 @@ class TestProbeSpec extends ScalaTestWithActorTestKit with WordSpecLike {
   "The test probe" must {
 
     "allow probing for actor stop when actor already stopped" in {
-      case object Stop
       val probe = TestProbe()
       val ref = spawn(Behaviors.stopped)
       probe.expectTerminated(ref, 100.millis)
@@ -142,6 +145,44 @@ class TestProbeSpec extends ScalaTestWithActorTestKit with WordSpecLike {
       }
     }
 
+    "allow receiving one message of type TestProbe[M]" in {
+      val probe = createTestProbe[EventT]()
+      eventsT(10).forall { e ⇒
+        probe.ref ! e
+        probe.receiveOne == e
+      } should ===(true)
+
+      probe.expectNoMessage()
     }
 
+    "timeout if expected single message is not received by a provided timeout" in {
+      intercept[AssertionError](createTestProbe[EventT]().receiveOne(100.millis))
+    }
+  }
+}
+
+object TestProbeSpec {
+
+  val timeoutConfig = ConfigFactory.parseString("""
+      akka.actor.testkit.typed.default-timeout = 100ms
+      akka.test.default-timeout = 100ms""")
+
+  /** Helper events for tests. */
+  final case class EventT(id: Long)
+
+  /** Creates the `expected` number of events to test. */
+  def eventsT(expected: Int): Seq[EventT] =
+    for (n ← 1 to expected) yield EventT(n)
+}
+
+class TestProbeTimeoutSpec extends ScalaTestWithActorTestKit(TestProbeSpec.timeoutConfig) with WordSpecLike {
+
+  import TestProbeSpec._
+
+  "The test probe" must {
+
+    "timeout if expected single message is not received by the default timeout" in {
+      intercept[AssertionError](createTestProbe[EventT]().receiveOne())
+    }
+  }
 }