integration.conf

# Incluimos application.conf

include "application.conf"

# Y sobreescribimos las variables de entorno que nos interesan

# MySQL database
jpa.default = mySqlPersistenceUnit

db {
  # MySQL database
  default.driver=com.mysql.jdbc.Driver
  default.url="jdbc:mysql://localhost:3306/mads"
  default.username=root
  default.password="mads"

  # You can expose this datasource via JNDI if needed (Useful for JPA)
  default.jndiName=DefaultDS
}

IntegrationUsuarioServiceTest.java

import org.junit.*;
import static org.junit.Assert.*;
import javax.inject.*;

import play.test.*;
import static play.test.Helpers.*;

import play.Application;
import play.Mode;
import play.inject.guice.GuiceApplicationBuilder;
import play.inject.Injector;
import play.inject.guice.GuiceInjectorBuilder;

import play.Environment;
import java.io.File;
import java.lang.ClassLoader;

import models.Usuario;
import models.UsuarioRepository;

import services.UsuarioService;
import services.UsuarioServiceException;

public class IntegrationUsuarioServiceTest {

   static private Injector injector;

   @BeforeClass
   static public void setUpInjector() {
      GuiceApplicationBuilder guiceApplicationBuilder =
          new GuiceApplicationBuilder().in(Environment.simple());
      injector = guiceApplicationBuilder.injector();
   }

   @Test
   public void crearNuevoUsuarioCorrectoTest(){
      UsuarioService usuarioService = injector.instanceOf(UsuarioService.class);
      Usuario usuario = usuarioService.creaUsuario("luciaruiz", "lucia.ruiz@gmail.com", "123456");
      assertNotNull(usuario.getId());
      assertEquals("luciaruiz", usuario.getLogin());
      assertEquals("lucia.ruiz@gmail.com", usuario.getEmail());
      assertEquals("123456", usuario.getPassword());
   }
}

shell

# Lanzamos run o test, cambiando el fichero de configuración:
$ sbt '; set javaOptions += "-Dconfig.file=conf/integration.conf"; run'
$ sbt '; set javaOptions += "-Dconfig.file=conf/integration.conf"; test'
$ sbt '; set javaOptions += "-Dconfig.file=conf/integration.conf"; testOnly Integration*'