光滑scala中DAL的误差测试

对scala和play来说是个新手，我被分配了一个任务来测试其他人的应用程序，它运行得很好。顺便说一句，请检查我的测试是否正确，错误是什么

这是模型中的employeeEntry.scala文件

 package models

import models.database.Employee
import play.api.db.slick.Config.driver.simple._
import play.api.db.slick._
import play.api.Play.current


case class EmployeeEntry(eid :Int, ename: String, eadd: String, emob: String)

object Employee {

val DBemp = TableQuery[Employee]


def savedat(value: EmployeeEntry):Long = {
    DB.withSession { implicit session =>
       DBemp+=EmployeeEntry(eid=value.eid,ename=value.ename,eadd=value.eadd,emob=value.emob)
    }}

/*val query = for (c <- Employee) yield c.ename 
    val result = DB.withSession {
                                 implicit session =>
                                 query.list // <- takes session implicitly
                                }*/
        //val query = for (c <- Employee) yield c.ename
   def getPersonList: List[EmployeeEntry] = DB.withSession { implicit session =>      DBemp.list }

  def Update: Int = DB.withSession { implicit session =>
 (DBemp filter (_.eid === 1) map (s => (s.ename,s.eadd))) update ("test","khair")}

  def delet :Int =DB.withSession {
  implicit session => (DBemp filter (_.eid === 1)).delete
}






 }

测试失败，错误为

  java.lang.RuntimeException: There is no started application
  at scala.sys.package$.error(package.scala:27)
  at play.api.Play$$anonfun$current$1.apply(Play.scala:71)
  at play.api.Play$$anonfun$current$1.apply(Play.scala:71)
  at scala.Option.getOrElse(Option.scala:120)
  at play.api.Play$.current(Play.scala:71)
  at models.Employee$.getPersonList(EmployeeEntry.scala:27)
  at databasetest$$anonfun$1$$anonfun$apply$mcV$sp$2.apply$mcV$sp(databasetest.scala:39)
  at databasetest$$anonfun$1$$anonfun$apply$mcV$sp$2.apply(databasetest.scala:39)
  at databasetest$$anonfun$1$$anonfun$apply$mcV$sp$2.apply(databasetest.scala:39)
  at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)

---

默认情况下，play提供spec2测试框架。因此无需为单元测试添加scalatest框架。对于数据库访问层测试，需要与数据库建立连接，因此启动一个假的应用程序。这不是运行代码，只是编写单元测试的一个想法 有关更多详细信息，请查看播放文档：

---

谢谢，我在阅读play framework文档时看到：play经常需要一个正在运行的应用程序作为上下文：它通常由play.api.play.current提供。运行应用程序在这里意味着什么？运行应用程序意味着play framework初始化所有需要的组件。这里需要与数据库连接，所以运行的应用程序会创建与数据库的连接。

 import play.api.db.slick.Config.driver.simple._
 import play.api.db.slick._
 import play.api.Play.current



 import org.scalatest.FunSpec
 import org.scalatest.matchers.ShouldMatchers
 import models.database.Employee
 import scala.slick.lifted._ 
 import models._
 import models.EmployeeEntry
 //import scala.slick.driver.H2Driver.simple._


 class databasetest extends FunSpec with ShouldMatchers{


   describe("this is to check database layer"){ 

       it("can save a row"){

            val a = EmployeeEntry(1006,"udit","schd","90909090")
            Employee.savedat(a) should be (1)


      }     


     it("getpersonlist"){



            Employee.getPersonList.size should be (1)


    }


     }

  }

  java.lang.RuntimeException: There is no started application
  at scala.sys.package$.error(package.scala:27)
  at play.api.Play$$anonfun$current$1.apply(Play.scala:71)
  at play.api.Play$$anonfun$current$1.apply(Play.scala:71)
  at scala.Option.getOrElse(Option.scala:120)
  at play.api.Play$.current(Play.scala:71)
  at models.Employee$.getPersonList(EmployeeEntry.scala:27)
  at databasetest$$anonfun$1$$anonfun$apply$mcV$sp$2.apply$mcV$sp(databasetest.scala:39)
  at databasetest$$anonfun$1$$anonfun$apply$mcV$sp$2.apply(databasetest.scala:39)
  at databasetest$$anonfun$1$$anonfun$apply$mcV$sp$2.apply(databasetest.scala:39)
  at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)

import org.specs2.mutable.Specification

import models.database.Employee
import models._
import models.EmployeeEntry
import play.api.test.FakeApplication
import play.api.test.Helpers.running
import play.api.Play.current


class databasetest extends Specification {

 "database layer" should {
     "save a row" in {
        running(FakeApplication()) {
           val a = EmployeeEntry(1006,"udit","schd","90909090")
           Employee.savedat(a) must be equalTo (1)
         }
       }
    "get list" in {
         running(FakeApplication()) {
           Employee.getPersonList.size must be equalTo (1)
         }
     }
}