Play is packaged with Specs2, since this is the library used internally for testing it. It provides support to test applications using Specs2 by default, that is, no additional library dependency is required.

Using ScalaTest earlier was difficult but now, Play also provides helpers for using ScalaTest. Although it is picked up from transitive dependencies, we need to add a library dependency to use the helper methods:

val appDependencies = Seq(
  "org.scalatestplus" %% "play" % "1.1.0" % "test"
)