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| /** | |
| * Scala IoC - Value injection on traits | |
| */ | |
| case class Car(id: Long, year: Int, brand: String) | |
| trait CarDao { | |
| def save(car: Car): Unit | |
| def findBy(id: Long): Option[Car] | |
| } | |
| class FileCarDao extends CarDao { | |
| override def save(car: Car): Unit = println("Saves car: " + car) | |
| override def findBy(id: Long): Option[Car] = Some(Car(id, 2009, "Volvo")) | |
| } | |
| trait RegistrationService { | |
| val carDao: CarDao | |
| def register(car: Car): Car = { | |
| carDao.save(car) | |
| car | |
| } | |
| } | |
| object Registration { | |
| val service = new RegistrationService { | |
| override val carDao: CarDao = new FileCarDao | |
| } | |
| } | |
| // Default registration service invocation | |
| Registration.service.register(Car(10, 2015, "BMW")) | |
| // Test case | |
| class RegistrationServiceTest { | |
| val registrationService = new RegistrationService { | |
| override val carDao: CarDao = mock(classOf[CarDao]) | |
| } | |
| test("that a car an be registered") { | |
| val car = registrationService.register(Car(1, 2014, "Audi")) | |
| car.id should be(1) | |
| } | |
| } |
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