Hi all. Second of two posts about some newcomer-ish problems getting my sea
legs with akka-http. As the library is new and the documentation evolving,
I'm hoping the answers will be useful to other folks! Here is problem
number 2.
I am trying to test this route:
object Main extends App with Config {
import system.dispatcher
implicit val system = ActorSystem("whereat-server")
implicit val materializer = ActorMaterializer()
def echo (loc: Location)(completer: Location ⇒ Unit) = completer(loc)
val route =
path("hello") {
get {
complete {
"hello world!" }
}
} ~
path("locations") {
post {
entity(as[Location]) { loc ⇒
completeWith(instanceOf[Location]) {
completer ⇒ echo(loc)(completer)
}
}
}
}
Http().bindAndHandle(route, httpInterface, httpPort)
println(s"Server online at http://localhost:$httpPort";)
}
With these specs:
import akka.http.scaladsl.model.HttpEntity
import akka.http.scaladsl.testkit.ScalatestRouteTest
import org.scalatest.{Matchers, WordSpec}
import support.SampleData
class MainSpec extends WordSpec with Matchers with ScalatestRouteTest {
lazy val route = Main.route
lazy val s17 = SampleData.s17
lazy val s17Json = SampleData.s17Json
"The service" should {
"respond to GET/hello with 'hello world!'" in {
Get("/hello") ~> route ~> check {
responseAs[String] shouldEqual "hello world!"
}
}
"respond to a properly formated POST/locations with echo" in {
Post("/locations", HttpEntity(`application/json`, s17Json)) ~> route ~>
check {
responseAs[String] shouldEqual s17Json
}
}
}
}
Using the route test in the examples from the akka-http docs on the
`example` directive
<http://doc.akka.io/docs/akka-stream-and-http-experimental/current/scala/http/routing-dsl/directives/marshalling-directives/entity.html#examples>
as my template for the test with the JSON route.
When I run the code from Main using foreman (locally) or remotely on
Heroku, it works as expected. The "/hello" route says "hello world!" and
the "/locations" endpoint echoes back a Location JSON object.
However, when I try to run my specs, a couple of bizarre things are
happening:
(1) The test for the "hello" route fails because the actual response is an
internal server error. (Despite the fact that this isn't true running the
live code!) And I get the following error messages:
[ERROR] [07/10/2015 23:52:50.540] [ScalaTest-run-running-MainSpec]
[ActorSystem(MainSpec)] Error during processing of request
HttpRequest(HttpMethod(GET),http://example.com/hello,List(),HttpEntity.Strict(none/none,ByteString()),HttpProtocol(HTTP/1.1))
java.lang.NullPointerException
at
akka.http.scaladsl.server.directives.ExecutionDirectives$$anonfun$handleExceptions$1$$anonfun$apply$1.apply(ExecutionDirectives.scala:27)
at
akka.http.scaladsl.server.directives.ExecutionDirectives$$anonfun$handleExceptions$1$$anonfun$apply$1.apply(ExecutionDirectives.scala:23)
at
akka.http.scaladsl.testkit.RouteTest$TildeArrow$$anon$1.apply(RouteTest.scala:132)
at
akka.http.scaladsl.testkit.RouteTest$TildeArrow$$anon$1.apply(RouteTest.scala:120)
at
akka.http.scaladsl.testkit.RouteTest$WithTransformation2.$tilde$greater(RouteTest.scala:101)
at
MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(MainSpec.scala:21)
at MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(MainSpec.scala:21)
at MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(MainSpec.scala:21)
(... truncated ...)
"[There was an internal server error.]" did not equal "[hello world!]"
ScalaTestFailureLocation:
MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$mcV$sp$2 at
(MainSpec.scala:22)
org.scalatest.exceptions.TestFailedException: "[There was an internal server
error.]" did not equal "[hello world!]"
at
org.scalatest.MatchersHelper$.newTestFailedException(MatchersHelper.scala:160)
at org.scalatest.Matchers$AnyShouldWrapper.shouldEqual(Matchers.scala:6303)
at
MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$mcV$sp$2.apply$mcV$sp(MainSpec.scala:22)
at
MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$mcV$sp$2.apply(MainSpec.scala:22)
at
MainSpec$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$mcV$sp$2.apply(MainSpec.scala:22)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)
Totally stumped!
(2) I get a compile error for the backtick notation used in
`application/json`. Not too surprising as that's a bit black-magic-looking.
I'm okay with using another way to specify this is a JSON request, I just
can't find any in the docs.
Can anyone help? Very much want to put this amazing new library into play
on my project and evangelize like crazy for akka-stream at Recurse Center
<https://www.recurse.com/>, but having a hard time getting out of the
gates. Show some love?
/a/
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