Akka: testing actor got message - akka

Question

I have the next code:
//TestActor got some message
class TestActor extends Actor {
def receive = {
case string: String => //....
}
}
//TestReg when create get ActorRef, when i call `pass` method, then should pass text to ActorRef
class TestReg(val actorRef: ActorRef) {
def pass(text: String) {
actorRef ! text
}
}
When i wrote test:
class TestActorReg extends TestKit(ActorSystem("system")) with ImplicitSender
with FlatSpecLike with MustMatchers with BeforeAndAfterAll {
override def afterAll() {
system.shutdown()
}
"actorReg" should "pass text to actorRef" in {
val probe = TestProbe()
val testActor = system.actorOf(Props[TestActor])
probe watch testActor
val testReg = new TestReg(testActor)
testReg.pass("test")
probe.expectMsg("test")
}
}
I got error:
java.lang.AssertionError: assertion failed: timeout (3 seconds) during expectMsg while waiting for test
How to check what the actor got a text?

Answer 1

probe.expectMsg() is calling the assertion on the probe. But you passed the testActor into your TestReg class
change it to the following line and it will work
val testReg = new TestReg(probe.ref)
have to call .ref to make the probe into an ActorRef
And you want to do it here not at the instantiation of the variable to avoid
certain bugs that are outside of the scope of this response
the error in the logic as I see it is you are thinking that the watch method makes probe see what test actor does. but its death watch not message watch. which is different.

Answer 2

Create application.conf file with this:
akka {
test {
timefactor = 1.0
filter-leeway = 999s
single-expect-default = 999s
default-timeout = 999s
calling-thread-dispatcher {
type = akka.testkit.CallingThreadDispatcherConfigurator
}
}
actor {
serializers {
test-message-serializer = "akka.testkit.TestMessageSerializer"
}
serialization-identifiers {
"akka.testkit.TestMessageSerializer" = 23
}
serialization-bindings {
"akka.testkit.JavaSerializable" = java
}
}
}