Scala Functional tests: How to do negative assertion?

Question

I have some restful services using Scala and play framework (2.4.*) and I am trying to write some functional tests for those services and getting hard time on negative assertions. For example :

If I receive a response ( in Json) from my service like :

{ "id":71324, "name":"Matt", "address":"24 Main st" }

I am trying to check that :

• "address" field exists and is non empty
• There does not exist any key named as "phone"

Finding hard time to find an example on how to do the above to assertion.

For other assertions, I did it this way:

class IntegrationTest extends PlaySpec with OneServerPerSuite with MockitoSugar { // need with mockito*?

  override lazy val app = new GuiceApplicationBuilder()
    .configure(Configuration.apply(ConfigFactory.parseFile(new File("test/resources/testApplication.conf")).resolve()))
    .overrides(bind[EmployeeDAO].to[MockEmployeeDAO])
    .build
  implicit lazy val log = LoggerFactory.getLogger(getClass)

  val wsClient = app.injector.instanceOf[WSClient]
  val myPublicAddress =  s"localhost:$port"


  "test1" must {
    "get employee record" in {
      val route = s"http://$myPublicAddress/INTERNAL/employee/7"
      val response = await(wsClient.url(route).get())
      log.debug(response.header("Content-Type") + " -> " + response.body)
      val jsonResponse = Json.parse(response.body)

      response.status mustBe OK

      (jsonResponse \ "id").get mustBe JsNumber(71324)
      (jsonResponse \ "name").get mustBe JsString("Matt")

      //trying to check that there is no phone

      //trying to check address fiels exists and is non-empty
      //(jsonResponse \ "address").get mustNot empty -- got systax error


    }

  }
}

May I get help here?

Answer 1

There are few problems with

(jsonResponse \ "address").get mustNot empty

The type of (jsonResponse \ "address") is JsLookupResult which has isEmpty() method, hence by checking for emptiness it seems reasonable to try

(jsonResponse \ "address") mustNot be (empty)

However this does not work because empty keyword DSL works on following types

• scala.collection.GenTraversable
• String
• Array
• scala.Option
• java.util.Collection
• java.util.Map
• arbitary object with a isEmpty() method that returns Boolean
• arbitary object with a parameterless isEmpty method that returns Boolean

where by "arbitary object" they really mean arbitrary reference object AnyRef

implicit def emptinessOfAnyRefWithIsEmptyMethod[T <: AnyRef { def isEmpty(): Boolean}]: Emptiness[T]

and JsLookupResult is not a subtype of AnyRef

sealed trait JsLookupResult extends Any with JsReadable

Therefore, because constraint T <: AnyRef { def isEmpty(): Boolean} is not satisfied, we cannot use the nice emptiness DSL.

Alternatively the following should work

(jsonResponse \ "address").isEmpty mustBe false
(jsonResponse \ "address").isDefined mustBe true