PlaceSpec.scala

import models.Place
import models.Place._
import org.specs2.mutable._

import org.specs2.ScalaCheck

import play.api.libs.json.Json

import org.scalacheck._
import Gen._
import Prop._
import Arbitrary._

/**
 * Add your spec here.
 * You can mock out a whole application including requests, plugins etc.
 * For more information, consult the wiki.
 */

object PlaceProp extends Properties("Place") {

  property("json from(to) iso") = forAll {
    p: Place =>
      println(s"p: $p")
      println(s"tojson: ${Json.toJson(p)}")
      println(s"from(to): ${Json.fromJson(Json.toJson(p))}")
      Json.fromJson(Json.toJson(p)) == p
  }

  lazy val genPlace: Gen[Place] = for {
    id <- arbitrary[Long]
    if (id > 0)
    name <- arbitrary[String]
    if (!name.isEmpty)
    address <- arbitrary[String]
    if (!address.isEmpty)
    city <- arbitrary[String]
    if (!city.isEmpty)
    zipcode <- arbitrary[String]
    if (!zipcode.isEmpty)
  } yield Place(Some(id), name, address, city, zipcode)

  implicit lazy val arbHeap: Arbitrary[Place] = Arbitrary(genPlace)
}

class PlaceSpec extends Specification with ScalaCheck {
  "json from(to) iso" ! PlaceProp
}

result

[play-fam] $ testOnly PlaceSpec
[info] Compiling 1 Scala source to /home/gbougeard/git/play-fam/target/scala-2.10/test-classes...
[warn] /home/gbougeard/git/play-fam/test/PlaceSpec.scala:27: play.api.libs.json.JsResult[models.Place] and models.Place are unrelated: they will most likely never compare equal
[warn]       Json.fromJson(Json.toJson(p)) == p
[warn]                                     ^
[warn] one warning found
p: Place(Some(2960914703493339579),䢂徔◻,ﶱ莋ꥑ纲딒,徧咃쫠螌,燱퇴낁,None,None,None,None)
tojson: {"id":2960914703493339579,"name":"䢂徔◻","address":"ﶱ莋ꥑ纲딒","city":"徧咃쫠螌","zipcode":"燱퇴낁"}
from(to): JsSuccess(Place(Some(2960914703493339579),䢂徔◻,ﶱ莋ꥑ纲딒,徧咃쫠螌,燱퇴낁,None,None,None,None),)
[info] PlaceSpec
[info] x json from(to) iso
[error]  A counter-example is 'Place(Some(2960914703493339579),䢂徔◻,ﶱ莋ꥑ纲딒,徧咃쫠螌,燱퇴낁,None,None,None,None)' (after 0 try)
[info] Total for specification PlaceSpec
[info] Finished in 345 ms
[info] 1 example, 1 failure, 0 error
[error] Failed: Total 1, Failed 1, Errors 0, Passed 0
[error] Failed tests:
[error] 	PlaceSpec
[error] (test:testOnly) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 4 s, completed Nov 8, 2013 12:10:23 PM