Specs2：在外面使用 After

Question

我正在尝试编写一个可变规范，该规范具有由 Scope 传入的值。我还需要能够在每次测试运行后进行一些清理。按照文档，我尝试使用 Outside 和 After 组合，但结果好坏参半。

第五个例子是正确的方法还是我错过了一些基本的东西？

import org.specs2.mutable.{After, Specification}
import org.specs2.specification.Outside

class ExampleSpec extends Specification {
  "Tests using Outside and After" >> {
    "#1 doesn't run the after" in c1() {
      (m: String) => {
        println("Running test 1.")
        success
      }
    }
    "#2 doesn't actually run the test" in new c2() {
      (m: String) => {
        println("Running test 2.")
        failure
      }
    }
    "#3 doesn't run the after" in (new t3{}) {
      (m: String) => {
        println("Running test 3.")
        success
      }
    }
    "#4 doesn't actually run the test" in new t4 {
      (m: String) => {
        println("Running test 4.")
        failure
      }
    }
    "#5 works, but is it the right way?" in new t5 {
      val sessionKey = outside // The test would have to call outside?
      println("Running test 5.")
      success
    }
  }

  trait common extends Outside[String] with After {
    def name: String
    def outside = "Used by the real test."
    def after = println("After for " + name)
  }
  case class c1() extends common { def name = "c1" }
  case class c2() extends common { def name = "c2" }
  trait t3 extends common { def name = "t3" }
  trait t4 extends common { def name = "t4" }
  trait t5 extends common { def name = "t5" }
}

这给出了以下输出：

Running test 1.
After for c2
Running test 3.
After for t4
Running test 5.
After for t5
[info] ExampleSpec
[info] 
[info] Tests using Outside and After
[info] + #1 doesn't run the after
[info] + #2 doesn't actually run the test
[info] + #3 doesn't run the after
[info] + #4 doesn't actually run the test
[info] + #5 works, but is it the right way?
[info] 
[info] Total for specification ExampleSpec
[info] Finished in 19 ms
[info] 5 examples, 0 failure, 0 error

注意：根据 Eric 的 cmets 到 Question 21154941，我意识到测试 1 和 2 不是正确的方法。我把它们放在这里是为了详尽无遗，因为在其他时候，您可以使用案例类进行上下文/变量隔离。

Answer 1

在您的情况下，最简单的做法是使用 org.specs2.specification.FixtureExample 特征：

class ExampleSpec extends Specification with FixtureExample[F] {
  "Tests using a fixture" >> {
    "you can use the fixture values" in { f: F =>
      println("Running test 1 with "+f.sessionKey)
      success
    }
    "there is cleanup after each example" in { f: F =>
      success
    }
  }

  def fixture[R : AsResult](f: F => R): Result = {
     try AsResult(f(F()))
     finally cleanup
  }

  def cleanup = println("cleanup")
}

case class F(sessionKey: String = "key")