Lab 3 - Actor System and Testing Actors

Testing code in scala - ScalaTest

• As a testing framework, we will use ScalaTest
• ScalaTest offers different styles of testing. In the repo examples, WordSpecLike style is used.

Testing actors

For testing actors we can use akka-actor-testkit-typed. Extending ScalaTestWithActorTestKit abstract class actor system for tests is created and all it's lifecycle is managed and cleaned up properly. We have two types of testing:

1. Synchronous testing on one thread, explained here: https://doc.akka.io/docs/akka/current/typed/testing-sync.html#synchronous-behavior-testing
2. Asynchronous testing - preffered as it more closely imitates real environment (uses real ActorSystem), explained here - https://doc.akka.io/docs/akka/current/typed/testing-async.html

How to run tests?

All tests are in src/test/scala/myActorTest. To run tests execute sbt test.

Assignment

The template for Lab 3: https://github.com/agh-reactive/reactive-scala-labs-templates/tree/lab-3

• be sure that your local lab-3 branch is up to date with remote one
• remember about merging solution from lab 2 into this branch

1. (20 points)

• Add new actors OrderManager and Payment and create an actor system according to the diagram below:

• Add test for CartActor. Tests should contain:

  • synchronous testing
  • asynchronous testing

2. (10 points) Using actor testkit implement tests for Checkout actor to assess the behavior presented below (in particular check if Cart actor receives ConfirmCheckoutClosed message from its child - Checkout)

3. (10 points) Change implementation to use in OrderManager the Adapted Response pattern. Tip: actors (e.g. Checkout) should send responses in the form of events (e.g. CheckoutClosed), and the adapter should map them into commands (e.g. ConfirmCheckoutClosed).

• More on the Message adapter pattern

Submission

Use the following steps to submit your solution.

First, before implementing the solution:

1. Merge lab2-solution -> master
2. Merge lab-3 -> master (resolve conflicts)

Next:

1. Create branch lab3-solution (from master)
2. Implement the assignments using lab3-solution
3. Create a PR lab3-solution -> master
4. Submit the link to the PR as a solution