Test for PlayFramework developers guys

ResultDiscardCookieTest.scala

import org.junit.runner._
import org.specs2.mutable._
import org.specs2.runner._
import play.api.mvc.{Cookie, DiscardingCookie, Results}
import play.api.test._

/**
 * Add your spec here.
 * You can mock out a whole application including requests, plugins etc.
 * For more information, consult the wiki.
 */
@RunWith(classOf[JUnitRunner])
class ApplicationSpec extends Specification {

  val initCookie = Cookie(
    name = "cName",
    value = "cValue",
    maxAge = Some(43200),
    path = "/",
    domain = None,
    secure = true,
    httpOnly = true,
    sameSite = None
  )

  val discardedCookie = DiscardingCookie(initCookie.name)

  "Application" should {


    "discard old cookie" in new WithApplication{

      val initResult = Results.Ok.withCookies(initCookie)

      val result = initResult.discardingCookies(discardedCookie)
      
      //Cookie name should be unique
      result.newCookies.count(_.name == initCookie.name) must be equalTo 1
      
      //Cookies count should not change
      result.newCookies.length must be equalTo initResult.newCookies.length
      
      //Cookies should have same name
      result.newCookies.count(_.name == initCookie.name) must be equalTo initResult.newCookies.count(_.name == initCookie.name)
    }
  }
}