HelloWorld.scala

//Controller

import play.api.mvc.{Action, Controller}

class HelloWorldController extends Controller {

  def helloWorld() = Action {
    Ok("Hello World")
  }

}



//Test

import org.scalatestplus.play.{OneAppPerTest, PlaySpec}
import play.api.test.FakeRequest
import play.api.test.Helpers._

class HelloWorldSpec extends PlaySpec with OneAppPerTest {

  "HelloWorld controller" should {
    "return 'Hello World' string" in {
      val page = route(app, FakeRequest(GET, "/")).get
      status(page) mustBe OK
      contentAsString(page) mustBe "Hello World"
    }
  }

}