为什么sbt会说"糟糕的符号引用..."用于ScalaTest的测试？

Question

我开始在sbt上使用ScalaTest.该build.sbt如下:

name := "MySpecSample"

version := "1.0"

libraryDependencies  += "org.scalatest" % "scalatest_2.11" % "2.2.0" % "test"

scalaVersion := "2.10.3" 

初始测试代码在这里.此测试代码单独运行,没有主要组件代码.

import collection.mutable.Stack
import org.scalatest._

class ExampleSpec extends FlatSpec with Matchers {

  "A Stack" should "pop values in last-in-first-out order" in {
    val stack = new Stack[Int]
    stack.push(1)
    stack.push(2)
    stack.pop() should be (2)
    stack.pop() should be (1)
  }

  it should "throw NoSuchElementException if an empty stack is popped" in {
    val emptyStack = new Stack[Int]
    a [NoSuchElementException] should be thrownBy {
      emptyStack.pop()
    } 
  }
}

我根据官方的快速入门写了它.但它不能正常工作.错误消息如下:

> test
[info] Compiling 1 Scala source to /Users/kaisasak/untitled/target/scala-2.10/test-classes...
[error] bad symbolic reference. A signature in package.class refers to type compileTimeOnly
[error] in package scala.annotation which is not available.
[error] It may be completely missing from the current classpath, or the version on
[error] the classpath might be incompatible with the version used when compiling package.class.
[error] /Users/kaisasak/untitled/src/test/scala/ExampleSpec.scala:6: Reference to class FlatSpec in package scalatest should not have survived past type checking,
[error] it should have been processed and eliminated during expansion of an enclosing macro.
[error] class ExampleSpec extends FlatSpec with Matchers {
[error]                         ^
[error] two errors found
[error] (test:compile) Compilation failed
[error] Total time: 3 s, completed Jun 29, 2014 11:20:41 AM

我可以在Google上找到相同的问题,但没有很好的答案.我的环境就在这里.

• MacOSX 10.9.3
• Scala 2.10.3
• sbt 0.13.2

我在降级后尝试使用sbt 0.13.1,但结果与0.13.2相同.我应该怎么做才能将scalaTest用于sbt？

Answer 1

在您的build.sbt设置中,使用以下内容将Scala的版本设置为2.10.3:

scalaVersion := "2.10.3" 

但是ScalaTest依赖项显式使用Scala 2.11(注意_2.11部分):

"org.scalatest" % "scalatest_2.11" % "2.2.0" % "test"

您必须为两者使用相同的主要scala版本.

使用sbt,您可以简单地确保使用%%而不是%如下:

"org.scalatest" %% "scalatest" % "2.2.0" % "test"