scala - 并行运行 ScalaTest 测试

Question

鉴于以下测试套件:

class ParallelizeMe extends FunSuite with BeforeAndAfterAll {

  override def beforeAll() = println("before")              
  override def afterAll()  = println("after")               

  test("test 1") {                                          
    println("1a")
    Thread.sleep(3000)                                      
    println("1b")                                           
  }

  test("test 2") {                                          
    println("2a")
    Thread.sleep(1000)                                      
    println("2b")
  }

} 

如何并行运行测试(通过 sbt)？理想情况下，我希望执行顺序在标准输出上产生以下内容:

before
1a
2a
2b
1b
after

Answer 1

使用 ParallelTestExecution和一个 -P Runner 的命令行参数使它们并行运行:

import org.scalatest.{ParallelTestExecution, BeforeAndAfterAll, FunSuite}
class ParallelizableSpec extends FunSuite with BeforeAndAfterAll with ParallelTestExecution {
   ...
}

请注意 -P 是必需的。从来源:

If you include -P on the command line, Runner will pass a Distributor to the Suites you specify with -s. Runner will set up a thread pool to execute any Suites passed to the Distributor's put method in parallel.

它还将单独运行测试，因此 before和 after将在每个线程中运行。在 ParallelTestExecution 的文档中查看更多信息和 Runner .

在 SBT 中，要使用该标志，请将其添加到 build.sbt :

testOptions in Test += Tests.Argument("-P")