Scala Play + Slick: How to inject dependencies to Spec tests? - scala

Question

I'm using Scala Play 2.7.x (the project is available here Play-Silhouette-Seed) and would like to test my daos. I have put together this simple one first to check what's the "new pattern" for testing play + slick + guice in 2.7.x:
package models.daos
import java.util.UUID
import org.specs2.mock._
import org.specs2.mutable._
import utils.AwaitUtil
import javax.inject.Inject
import models.generated.Tables.LoginInfoRow
class LoginInfoDaoSpec #Inject() (loginInfoDao: LoginInfoDao) extends Specification with Mockito with AwaitUtil {
"Creating a new LoginInfo" should {
"save it in the empty database" in {
loginInfoDao.create(LoginInfoRow(0, UUID.randomUUID().toString, UUID.randomUUID().toString))
loginInfoDao.findAll.size should beEqualTo(1)
}
}
}
Unfortunately, the guice dependency LoginInfoDao is not being provided to my test and then I get the error:
[play-silhouette-seed] $ testOnly models.daos.LoginInfoDaoSpec
[info] Done compiling.
[error] Can't find a suitable constructor with 0 or 1 parameter for class models.daos.LoginInfoDao
[info] ScalaTest
[info] Run completed in 1 second, 966 milliseconds.
[info] Total number of tests run: 0
[info] Suites: completed 0, aborted 0
[info] Tests: succeeded 0, failed 0, canceled 0, ignored 0, pending 0
[info] No tests were executed.
[error] Error: Total 1, Failed 0, Errors 1, Passed 0
How do I get guice loading the needed modules for my test-cases?
A module is defined as:
class SilhouetteModule extends AbstractModule with ScalaModule {
override def configure() {
// ...
bind[LoginInfoDao].to[LoginInfoDaoImpl]
// ...
}
}
and I have an application.test.conf available defined as:
include "application.conf"
slick.dbs {
default {
profile="slick.jdbc.MySQLProfile$"
db.driver="com.mysql.cj.jdbc.Driver"
db.url="jdbc:mysql://localhost:3306/mytestdb?useUnicode=true&searchpath=public&serverTimezone=CET"
db.user="dev"
db.password="12345"
}
}

Answer 1

You should use another database for testing, H2 is the common choice.
class Module extends AbstractModule with ScalaModule {
...
}
With that name you need to let play know there is a Module to load, if you call it Module, it automatically know what to load and should work just fine (if you only need 1 module in testing)
If that doesn't work let me know