add some documentation to the test cases we are working on.

app/tests/Domain/Repository/UserRepositoryTest.php

@@ -34,6 +34,10 @@ class UserRepositoryTest extends TestCase
 
         $results = $userRepository->create($user);
         $this->assertTrue($results);
+        /**
+         * We are testing if the User entity has been mutated by the `create`
+         * method in the UserRepository.
+         */
         $this->assertEquals(100, $user->getId());
     }
 }