Scala、Specs2 和共享状态

Question

我正在编写一些 Specs2 规范；看起来像：

class ComponentSpecification extends Specification with Mockito {

  private val dependency = mock[Dependency]
  private val subject = new Component(..)

  "methodOne" should {
    "handle happy path" in {
       val result = subject.methodOne("Param1", 42)
       result must ...
       there was one(dependency).something()
    }

    "deal with border case" in {
       val result = subject.methodOne("", -1)
       result must ...
       there was one(dependency).something()
    }
  }
}

但是，这些测试失败了，因为 mock[Dependency] 是共享的。

一个解决方案是让它们按顺序排列并在每次测试前重置模拟，但这看起来很奇怪，正如文档中写的关于 "Parallel by default":

it encourages to write independent examples when the result of a given example should not be influenced by others

另一种方法是将 val 移动到测试本身。但是虽然我应该能够减少重复，但它仍然看起来像一个奇怪的结构。看起来 subject 是有状态的，但它不应该。
我也可以通过 there was atLestOne(dependency).something() 验证来尝试使用不太严格的方法，但是：
1. 这不会验证在这个特定的测试用例中调用了该方法，
2. 参数捕获和验证很痛苦。

所以我的问题是：

如何在 mock 上创建具有详细验证的可读测试。

非常感谢。

Answer 1

Scopes 可以像这样为每个测试提供新鲜状态

class ComponentSpecification extends mutable.Specification with Mockito {
  trait FooScope extends Scope {
    val dependency = mock[Dependency]
    val subject = new Component(dependency)
  }

  "methodOne" should {
    "handle happy path" in new FooScope {
      val result = subject.methodOne("Param1", 42)
      there was one(dependency).something()
    }

    "deal with border case" in new FooScope {
      val result = subject.methodOne("", -1)
      there was one(dependency).something()
    }
  }
}

无需在每次测试前重置模拟。

Answer 2

我打算接受@Mario Galic 的回答。然而，关于@Eric（Specs2 的作者）的评论，我以一种按预期创建上下文但删除重复的方法结束。通过使用模式匹配，我提取了有趣的部分：

class ComponentSpecification extends mutable.Specification with Mockito {
  def givenOneCallToMethodOneWithDependency(s:String, i:Int):(Result, Dependency) = {
    val dependency = mock[Dependency]
    val subject = new Component(dependency)
    val result = subject.methodOne(s, i)
    (result, dependency)
  }

  "methodOne" should {
    "handle happy path" in new FooScope {
      val (result, dependency) = givenOneCallToMethodOneWithDependency("Param1", 42)
      there was one(dependency).something()
    }

    "deal with border case" in new FooScope {
      val (result, dependency) = givenOneCallToMethodOneWithDependency("", -1)

      there was one(dependency).something()
    }
  }
}

Scala、Specs2 和共享状态

Scala, Specs2 and shared state

scala

testing

specs2