Awesome

Exercise 2

In this exercise we continue with the end result of exercise 1.

In the previous exercise we ended up with a Receptionist that creates a child ReverseActor to do the actual work (String reversal). The ReceptionistSpec is more of an integration test than a unit test right now. Both the Receptionist and the ReverseActor are tested at once.

In this exercise we are going to decouple the Receptionist from the ReverseActor so that we can use a mock to only test the Receptionist. A CreationSupport trait has been added for creating and getting references to child actors. The ReverseResponse has an added property, isPalindrome. The ReverseActor should now return a ReverseResult if it could reverse the string or a PalindromeResult case object if the received string value is a palindrome and reversal has no effect.

###Objective

The objective of this exercise is to create a unit test for the Receptionist that simply checks that it returns the correct response when a mock actor returns a PalindromeResult or a ReverseResult. This should be achieved by creating a TestCreationSupport trait in the ReceptionistSpec that creates a FakeReverseActor which only responds to the cases defined in the test.

###What is already prepared

The end result of exercise 1 is the starting point of this exercise. Added to this a CreationSupport trait is created and the ReverseResponse now includes an isPalindrome boolean.

###The Exercise

Create an ActorContextCreationSupport that extends the existing CreationSupport and uses an ActorContext to implement the methods.

Change Receptionist class to mix in the ActorContextCreationSupport trait.

Change the ReverseActor so it returns a PalindromeResult or a ReverseResult.

In Receptionist, based on the result of the ReverseActor (ReverseResult or PalindromeResult) complete with a ReverseResponse that indicates isPalindrome true or false.

Make the ReceptionistSpec work as a unit test with a FakeReverseActor. Also make the ReverseActorSpec work.

###Next Exercise

In the next exercise we're going to communicate with an asynchronous library from an Actor. You will learn how to initialize an Actor with become. Go to Exercise 3