Play Slick:如何在测试中注入 DbConfigProvider [英] Play Slick: How to inject DbConfigProvider in tests

问题描述

我使用的是 Play 2.5.10、Play-slick 2.0.2，我的激活器生成的项目带有 scalatest 和如下代码:

I am using Play 2.5.10, Play-slick 2.0.2, and my activator-generated project comes with scalatest and code like this:

class TestSpec extends PlaySpec with OneAppPerSuite {...}

我设法测试了路由/操作；现在我将在较低级别测试 DAO 方法.我在网上和 SO 上搜索了解决方案，但找不到任何仍然是最新的.一个 DAO 签名是这样的:

I managed to test routes/Actions; now I would test DAO methods on a lower level. I searched the web and SO for a solution, and could not find any that is still up-to-date. A DAO signature is like this:

class TestDAO @Inject()(protected val dbConfigProvider: DatabaseConfigProvider) extends HasDatabaseConfigProvider[JdbcProfile]

所以我需要将 dbConfigProvider 传递给它.出于某种原因，我无法像在控制器中那样将提供程序注入到测试中(没有错误，测试不会运行):

so I need to pass it the dbConfigProvider thing. For some reason I can't inject the provider into the tests like we do in controllers (no error, tests just won't run):

class TestSpec @Inject()(dbConfigProvider: DatabaseConfigProvider) extends PlaySpec with OneAppPerSuite {...}

Play-Slick 文档说我们也可以使用全局查找

The Play-Slick docs say we can alternatively use a global lookup

val dbConfig = DatabaseConfigProvider.get[JdbcProfile](Play.current)

但它不会直接工作，因为

but it won't work directly because

没有启动的应用程序

并链接到执行此操作的示例项目:

and link to an example project doing that:

class TestDAOSpec extends Specification {
  "TestDAO" should {
    "work as expected" in new WithApplicationLoader {   // implicit 'app'
      val app2dao = Application.instanceCache[TestDAO].apply(app)

但我永远找不到WithApplicationLoader.相反，似乎有一个 WithApplication:

but I could never find the WithApplicationLoader. Instead, there seems to be a WithApplication:

class TestDAOSpec extends Specification {
  "TestDAO" should {
    "work as expected" in new WithApplication() {   // implicit 'app'
      val app2dao = Application.instanceCache[TestDAO].apply(app)

但后来我明白了

类型不匹配:需要 play.api.Application，得到:play.Application.

Type mismatch: expected a play.api.Application, got: play.Application.

此时我失去了希望.

如何测试 DAO?

注意我不需要切换数据库进行测试(我通过配置处理)，我只想访问测试中的默认数据库.

N.B. I don't need to switch databases for testing (I handle this via config), I just want to access the default database in tests.

推荐答案

您可以使用:

lazy val appBuilder: GuiceApplicationBuilder = new GuiceApplicationBuilder().in(Mode.Test) 
lazy val injector: Injector = appBuilder.injector()
lazy val dbConfProvider: DatabaseConfigProvider = injector.instanceOf[DatabaseConfigProvider]

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