I am using playframework 2.6 and play-slick 0.8.0.
Action code:
def addCompany = Authenticated {
 DBAction(parse.json) {
   implicit rs => {
     val newCompany = rs.request.body
     val result = CompanyTable.insert(newCompany.as[Company])(rs.dbSession)
     if(result > 0)
       Ok("{\"id\":"+result+"}")
     else
       Ok("New company was not created.")
   }
 }
}
The Action is a composition of an Action that just checks for a valid session and the DBAction, which requires the request body to have a valid JSON object.
Test code:
"should create a Company from a Json request" in new InMemoryDB {
  val newCompany = Company(name = "New Company1")
  val fr = FakeRequest(POST, "/company")
    .withSession(("email", "bob@villa.com"))
    .withHeaders(CONTENT_TYPE -> "application/json")
    .withJsonBody(Json.toJson(newCompany))
  val action = controllers.CompanyController.addCompany
  val result = action(fr).run
  status(result) should be_==(OK)
  (contentAsJson(result) \ "id").as[Long] should be_>(1L)
}
The InMemoryDB class is just a FakeApplication with a pre-populated in memory database.
The issue that I am having is that when the test runs the result is always a 400 with body content containing a message saying [Invalid Json]. When I call the service using curl with the same JSON body content, it works and the id is returned.