Play! Scala: inject a inMemory Database instead of PostgreSQL in test using Slick

I would like to test a class that injects a DatabaseConfigProvider. I would like to use inMemory database instead of PostgreSQL during the tests. The class looks like this one (I'm using Slick 3):

class myClass @Inject() (protected val dbConfigProvider: DatabaseConfigProvider)
    extends HasDatabaseConfigProvider[MyPostgresDriver] {

Today without using an inMemory database, to test my class, I inject dbConfProvider, defined as:

lazy val appBuilder = new GuiceApplicationBuilder()
  .in(Mode.Test)
  .configure(Map("akka.remote.netty.tcp.port" -> 0))
lazy val injector = appBuilder.injector()
lazy val dbConfProvider = injector.instanceOf[DatabaseConfigProvider]

and I get an instance of the class like this:

val myClass = new MyClass(dbConfProvider)

How can I inject an inMemory database instead?