gistfile1.scala

// ...
import com.escalatesoft.subcut.inject._
import NewBindingModule._
//...

trait SomeService {
  def name:String
}

object RealService extends SomeService {
  def name = "real"
}

object FakeService extends SomeService {
  def name = "fake"
}

object MySingleton {
  def someMethod(someArgument:String)(implicit bindingModule:BindingModule):String = { // implicit argument is passed
    val service = bindingModule.inject[SomeService](None) // pay attention to None
    val serviceName = service.name
    s"This is $serviceName service"
  }
}

object SomeConfigurationModule extends NewBindingModule(module =>{
  module.bind [SomeService] toSingle RealService
})

// for use on production
MySingleton.someMethod("ololo")(SomeConfigurationModule)

// for testing
SomeConfigurationModule.modifyBindings { implicit bindingModule =>
  bindingModule.bind [SomeService] toSingle FakeService
  MySingleton.someMethod("argument")
}