scala - Scalamock scalatest - Not able to stub -


i have created workflow processor trait similar 1 mentioned below:

import org.scalatestplus.play._ import play.api.mvc._ import play.api.test._ import play.api.test.helpers._ import org.scalatest.matchers._ import org.scalamock.scalatest.mockfactory import utils.oauthutils._ import utils.oauthutils import utils.oauthprocess import play.api.application import scala.concurrent.executioncontext import scala.concurrent.future import play.api.libs.json.jsresult import play.api.libs.json.json import play.api.libs.json.jssuccess import play.api.libs.json.jserror import play.api.libs.ws.ws    trait myprocess[a] {   type b   type c   type d   def stage1(s: string): b   def stage2(b: b)(implicit e: executioncontext, app: application, a: a):       future[c]   def stage3(c: c)(implicit e: executioncontext, app: application, a: a): future[jsresult[d]]   def process(s: string)(implicit e: executioncontext, app: application, a: a): future[jsresult[d]] = {    val b = stage1(s)    val f_d = {       c <- stage2(b)       d <- stage3(c)    } yield d    f_d  } }

now unit test code. created nicer little scalatest scalamock test suite:

class testcontroller extends playspec results mockfactory {   "mycontroller" must {     " testing method process" in {   running(fakeapplication()) {      implicit val context = scala.concurrent.executioncontext.implicits.global     implicit val s = "implicit string"     implicit val currentapp = play.api.play.current    case class testparms(s: string)   abstract class testprocessor extends myprocess[testparms] {       type b = string       type c = string       type d = string     }      implicit val t = stub[testprocessor]     t.stage1(_: string).when(token).returns(testtoken)      (t.stage2(_: string)(_: executioncontext, _: application, _: testparms)).when(token, context, currentapp, tp).returns({       future.successful(stage2string)     })     (t.stage3(_: string)(_: executioncontext, _: application, _: testparms)).when(token, context, currentapp, tp).returns({       future.successful(json.fromjson[string](json.parse(stage3string)))      })    }  } } }

my expectation set stub on different class , test class. stubs (t.stage2 , t.stage3) compile fine following statement doesn't compile.

 t.stage1(_: string).when(token).returns(testtoken)

compiler reports following issue:

overloaded method value when alternatives:   (resultofafterwordapplication: org.scalatest.words.resultofafterwordapplication)unit <and>   (f: => unit)unit  cannot applied (string)  testcontroller.scala  /play-scala/test/controllers

could help? finding difficult write unit tests scala classes mocking them.

scalatest versions build.sbt:

 "org.scalatestplus" %% "play" % "1.2.0" % "test",  "org.scalamock" %% "scalamock-scalatest-support" % "3.2" % "test",

try wrapping invocation in parens

(t.stage1(_: string)).when(token).returns(testtoken)

i believe scalac thinks you're trying call when on instance of string (since what's returned t.stage1(_)).


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