以下测试应通过，但不能通过
class EngineTest extends FunSuite {
test("engine should not be null") {
val manager: ScriptEngineManager = new ScriptEngineManager
val engine: ScriptEngine = manager.getEngineByName("nashorn")
assert(engine != null)
}
}
在manager.getEngineFactories()似乎是空的。为什么？如何初始化上下文？
您正在使用什么版本？这是sbt .13。
> console
[info] Starting scala interpreter...
[info]
Welcome to Scala version 2.11.0 (OpenJDK 64-Bit Server VM, Java 1.7.0_25).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import javax.script._
import javax.script._
scala> new ScriptEngineManager().getEngineByName("scala")
res0: javax.script.ScriptEngine = scala.tools.nsc.interpreter.IMain@7078c799
scala> new ScriptEngineManager().getEngineByName("rhino")
res1: javax.script.ScriptEngine = com.sun.script.javascript.RhinoScriptEngine@5c854934
scala> new ScriptEngineManager().getEngineFactories
res2: java.util.List[javax.script.ScriptEngineFactory] = [com.sun.script.javascript.RhinoScriptEngineFactory@454ee4c0, scala.tools.nsc.interpreter.IMain$Factory@354e3bce]
等等，您询问了测试环境-
好吧，在我对解码更多sbt失去兴趣之前，添加了libraryDependencies：
"org.scala-lang" % "scala-compiler" % scalaVersion.value % "test",
启用查找Scala脚本引擎的位置：
@Test def engines: Unit = {
import javax.script._
val all = new ScriptEngineManager().getEngineFactories
Console println s"Found ${all.size}: $all"
assert(all.size > 0)
}
毫无疑问，有一种简单的方法可以直接将runtime：full-classpath添加到test：full-classpath。因为它是简单的构建工具，对吗？
对于Java 8上的Nashorn，请注意以下位置：
> set fullClasspath in Test += Attributed.blank(file(s"${util.Properties.javaHome}/lib/ext/nashorn.jar"))
[info] Defining test:fullClasspath
[info] The new value will be used by test:console, test:executeTests and 5 others.
[info] Run `last` for details.
[info] Reapplying settings...
[info] Set current project to goofy (in build file:/home/apm/goofy/)
> test
Found 1: [jdk.nashorn.api.scripting.NashornScriptEngineFactory@7fa2239d]
[info] Passed: Total 10, Failed 0, Errors 0, Passed 10
更新：https：//github.com/sbt/sbt/issues/1214
// Somehow required to get a js engine in tests (https://github.com/sbt/sbt/issues/1214)
fork in Test := true
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我来说两句