尝试在 Scala 中为 Play Web 应用程序的 Slick 数据库创建单元测试

Posted 2023-03-31

【中文标题】尝试在 Scala 中为 Play Web 应用程序的 Slick 数据库创建单元测试

【英文标题】：Trying to create Unit tests for Slick database for Play web application in Scala

【发布时间】：2018-02-02 12:52:20

【问题描述】：

我正在努力尝试使用 Scala 为我的 Play Web 应用程序配置单元测试。我正在使用 Play 2.6 和 Scala 2.11.8。当我使用数据库配置并执行sbt test 时，我在控制台上收到错误No implementation for play.api.db.slick.DatabaseConfigProvider was bound。所以我将展示我如何设置我的网络应用程序，也许有人可以指出哪里出了问题。只是为了方便起见，Web 应用程序运行良好。这只是我无法创建的数据库的单元测试。

build.sbt

import play.sbt.PlayImport._

name := """crypto-miners-demo"""    
version := "1.0-SNAPSHOT"    
lazy val root = (project in file(".")).enablePlugins(PlayScala)    
scalaVersion := "2.11.8"

libraryDependencies += guice
libraryDependencies += evolutions
libraryDependencies += jdbc
libraryDependencies += filters
libraryDependencies += ws

libraryDependencies += "com.h2database" % "h2" % "1.4.194"
libraryDependencies += "com.typesafe.play" %% "anorm" % "2.5.3"
libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "3.1.0" % Test

libraryDependencies += "com.typesafe.play" %% "play-slick" % "3.0.0"
libraryDependencies += "com.typesafe.play" %% "play-slick-evolutions" % "3.0.0"
libraryDependencies += "org.xerial" % "sqlite-jdbc" % "3.19.3"

libraryDependencies += "org.apache.spark" %% "spark-core" % "2.2.0"
libraryDependencies += "org.apache.spark" %% "spark-sql" % "2.2.0"

dependencyOverrides += "com.fasterxml.jackson.core" % "jackson-databind" % "2.6.5"

application.conf：

play.application.loader = di.ApplicationLoader

play.filters.csrf.header.bypassHeaders 
  X-Requested-With = "*"
  Csrf-Token = "nocheck"

play.filters.csrf.bypassCorsTrustedOrigins = false
play.filters.disabled += play.filters.csrf.CSRFFilter

slick.dbs.default.profile = "slick.jdbc.SQLiteProfile$"
slick.dbs.default.db.driver = "org.sqlite.JDBC"
slick.dbs.default.db.url = "jdbc:sqlite:development.db"
slick.dbs.default.db.username = ""
slick.dbs.default.db.password = ""

db.default 
  driver = org.sqlite.JDBC
  url = "jdbc:sqlite:development.db"
  username = ""
  password = ""


play.modules.disabled += "play.api.db.DBModule"

RackRepositorySpec.scala：

import org.scalatestplus.play.PlaySpec
import org.scalatestplus.play.guice.GuiceOneAppPerTest
import play.api.db.evolutions._
import play.api.db.slick.DatabaseConfigProvider
import play.api.db.Database, Databases
import play.api.inject.bind
import play.api.inject.guice.GuiceInjectorBuilder
import play.api.test.Injecting

class RackRepositorySpec extends PlaySpec with GuiceOneAppPerTest with Injecting 

  val database = Databases(
    driver = "org.sqlite.JDBC",
    url = "jdbc:sqlite:development.db",
    name = "default",
    config = Map(
      "username" -> "",
      "password" -> ""
    )
  )
  val guice = new GuiceInjectorBuilder()
    .overrides(bind[Database].toInstance(database))
    .injector()
  val defaultDbProvider = guice.instanceOf[DatabaseConfigProvider]

  def beforeAll() = Evolutions.applyEvolutions(database)

  def afterAll() = 
    // Evolutions.cleanupEvolutions(database)
    database.shutdown()
  
  Evolution(
    1,
    "create table test (id bigint not null, name varchar(255));",
    "drop table test;"
  )

当我执行 sbt test 时出现此错误：

[info] models.RackRepositorySpec *** ABORTED ***
[info]   com.google.inject.ConfigurationException: Guice configuration errors:
[info] 
[info] 1) No implementation for play.api.db.slick.DatabaseConfigProvider was bound.
[info]   while locating play.api.db.slick.DatabaseConfigProvider
[info] 
[info] 1 error
[info]   at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1045)
[info]   at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1004)
[info]   at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1054)
[info]   at play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:409)
[info]   at play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:404)
[info]   at play.api.inject.ContextClassLoaderInjector$$anonfun$instanceOf$2.apply(Injector.scala:117)
[info]   at play.api.inject.ContextClassLoaderInjector.withContext(Injector.scala:126)
[info]   at play.api.inject.ContextClassLoaderInjector.instanceOf(Injector.scala:117)
[info]   at models.RackRepositorySpec.<init>(RackRepositorySpec.scala:26)
[info]   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

【问题讨论】：

你可以看看acolyte.eu.org

【参考方案1】：

我在 build.sbt 中使用 libraryDependencies += specs2 % Test 解决了问题。我希望这是 slick 的一个好习惯：

import org.specs2.mutable.Specification
import play.api.Application
import play.api.test.WithApplicationLoader

import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Await, Future
import scala.concurrent.duration.DurationInt

class RackRepositorySpec extends Specification 

  "RackRepository" should 
    "work as expected" in new WithApplicationLoader 
      val app2dao = Application.instanceCache[RackRepository]
      val rackRepository: RackRepository = app2dao(app)

      Await.result(rackRepository.delete("r-1"), 3 seconds)
      Await.result(rackRepository.delete("r-2"), 3 seconds)
      Await.result(rackRepository.delete("r-3"), 3 seconds)

      val testRacks = Set(
        RackRow("r-1", 0.2F, System.currentTimeMillis()),
        RackRow("r-2", 0.5F, System.currentTimeMillis()),
        RackRow("r-3", 0.8F, System.currentTimeMillis())
      )

      Await.result(Future.sequence(testRacks.map(rackRepository.insert)), 3 seconds)
      val storedRacks = Await.result(rackRepository.list(), 3 seconds)

      storedRacks.toSet must contain(testRacks)