ReactiveMongo 0.12 + ScalaTest WordSpec

build.sbt

val reactiveMongo = "org.reactivemongo" %% "play2-reactivemongo" % "0.12.0"
val scalatest = "org.scalatest" %% "scalatest" % "3.0.0" % "test"

lazy val root = (project in file(".")).
  enablePlugins(PlayScala).
  settings(
    organization := "com.cisco",
    version := "1.0-SNAPSHOT",

    scalaVersion := "2.11.8",
    scalacOptions in ThisBuild ++= Seq("-feature", "-language:implicitConversions"),

    libraryDependencies ++= Seq(reactiveMongo, scalatest)
  )

ExampleSpec.scala

import org.scalatest.{AsyncWordSpec, Matchers}
import play.api.libs.json._
import reactivemongo.api.{Cursor, MongoDriver, ReadPreference}
import reactivemongo.play.json._
import reactivemongo.play.json.collection.JSONCollection

import scala.concurrent.Future

class ExampleSpec extends AsyncWordSpec with Matchers {

  val driver = new MongoDriver
  val connection = driver.connection(Seq("192.168.99.100"))
  val db = connection.database("db")

  def col(name: String = "city"): Future[JSONCollection] = db.map(_.collection[JSONCollection](name))

  "City collection" should {
    "have size 19" in {
      col().flatMap(
        _.find(Json.obj()).
          cursor[JsObject](ReadPreference.primary).
          collect[Seq](-1, Cursor.FailOnError[Seq[JsObject]]())
      ).map {_ should have size 19}
    }
  }

}