如何在scala的specs2测试中使用jUnit的TemporaryFolder？ [英] How to use jUnit's TemporaryFolder in scala's specs2 tests?

问题描述

我正在用Playframework写一个测试，我需要创建一个临时文件。
$ b

@RunWith（classOf [JUnitRunner]）
class DiagnosticSpec extends Specification {
@Rule $ b $ val temporaryFolder：TemporaryFolder = new TemporaryFolder（）

my test在{
val file = temporaryFolder.newFile（）// line.35
//继续执行文件
} $ b $ {
运行临时文件b}
}


但是当我运行这个测试的时候， p>

  [error] IllegalStateException：临时文件夹尚未创建（MyTest.scala：35）
  

可以在specs2中使用它吗？如果没有，我怎样才能在specs2中创建一个临时文件，并在测试后自动删除它？ 你不能使用JUnit规则与specs2做安装/拆卸。您需要使用 AroundExample 或 FixtureExample 作为：

  trait TempFile extends AroundExample {
 //这个代码在每个例子的周围执行
 def around [R：AsResult] （r）
 finally f.delete 
 
 
类MySpec扩展了TempFile的规范{
test>> {
 //在这里使用文件
 val file = new File（test）
 ... 
} 
} 
 
 //或
 trait TempFile extends FixtureExample [File] {
 //这个代码在每个例子中执行
 def fixture [R：AsResult]（f：File => R） = 
 val f = createFile（test）
尝试AsResult（f（r））
 finally f.delete 
} 
 
 class MySpec extends用TempFile指定{
 //对于每个测试，文件都可以被注入
test>> {file：File => 
 //使用这里的文件
 ... 
} 
} 
  

UPDATE
$ b

TemporaryFolder trait更接近原来的JUnit规则：

trait TemporaryFolder extends Specification {
/ **在规范末尾删除临时目录* /
覆盖def map（fs：=> Fragments）= super.map（fs ^ Step（delete））

lazy val tempDir = {
val dir = File.createTempFile（test，）
dir.delete
dir.mkdir
dir
}

/ **在临时目录中创建一个新文件* /
def createNewFile = {
val f = new File（tempDir.getPath +/+ UUID.randomUUID.toString）
f.createNewFile
f
}

/ **删除目录中的每个文件和目录本身* /
def delete = {
选项（tempDir.listFiles）.MAP（_。toList）.getOrElse（无）.foreach（_。delete）
tempDir.delete
}
}

class MySpec将Specification扩展为TemporaryFolder {
test>> ; {
//在这里使用文件
val file = createNewFile
...
}
}


I'm writing a test with Playframework, and I need to create a temporary file.

@RunWith(classOf[JUnitRunner])
class DiagnosticSpec extends Specification {
  @Rule
  val temporaryFolder: TemporaryFolder = new TemporaryFolder()

  "my test" should {
     "run with temporary file" in {
        val file = temporaryFolder.newFile()   // line.35
        // go on with the file
     }
  }
}

But when I run this test, it always throw exception:

[error]     IllegalStateException: the temporary folder has not yet been created (MyTest.scala:35)

Is it possible to use it in specs2? If not, how can I create a temporary file in specs2, and delete it automatically after testing?

解决方案

You cannot use JUnit rules with specs2 to do setup/teardown. You need to use AroundExample or FixtureExample for that:

trait TempFile extends AroundExample {
  // this code is executed "around" each example
  def around[R : AsResult](r: =>Result) = 
    val f = createFile("test")
    try AsResult(r)
    finally f.delete
}

class MySpec extends Specification with TempFile {
  "test" >> {
    // use the file here
    val file = new File("test")
    ...
  }
}

// Or
trait TempFile extends FixtureExample[File] {
  // this code is executed "around" each example
  def fixture[R : AsResult](f: File => R) = 
    val f = createFile("test")
    try AsResult(f(r))
    finally f.delete
}

class MySpec extends Specification with TempFile {
  // the file can be "injected" for each test
  "test" >> { file: File =>
    // use the file here
    ...
  }
}

UPDATE

The TemporaryFolder trait is closer to the original JUnit rule:

trait TemporaryFolder extends Specification {
  /** delete the temporary directory at the end of the specification */
  override def map(fs: =>Fragments) = super.map(fs ^ Step(delete))

  lazy val tempDir = {
    val dir = File.createTempFile("test", "")
    dir.delete
    dir.mkdir
    dir
  }

  /** create a new file in the temp directory */
  def createNewFile = {
    val f = new File(tempDir.getPath+"/"+UUID.randomUUID.toString)
    f.createNewFile
    f
  }

  /** delete each file in the directory and the directory itself */
  def delete = {
    Option(tempDir.listFiles).map(_.toList).getOrElse(Nil).foreach(_.delete)
    tempDir.delete
  }
}

class MySpec extends Specification with TemporaryFolder {
  "test" >> {
    // use the file here
    val file = createNewFile
    ...
  }
}

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