为什么设置（在程序集中测试）会产生类型错误？答案

【问题标题】：Why does setting (test in assembly) give type error?为什么设置（在程序集中测试）会产生类型错误？
【发布时间】：2016-07-17 13:54:37
【问题描述】：

我在一个多模块项目中使用 sbt 0.13.8 和 sbt-assembly 0.13.0。在我尝试在装配期间关闭测试之前，一切都很好。

按照文档中的说明，我添加了这一行

test in assembly := {}

在我的一个模块的设置中并得到以下错误

/Users/lanny/work/IdeaProjects/Search/build.sbt:61: error: type mismatch;
 found   : sbt.TaskKey[sbt.File]
 required: java.io.File
      test in assembly := {},
          ^
sbt.compiler.EvalException: Type error in expression

我很乐意显示“检查测试”的结果，但是很遗憾，如果不删除导致错误的行，我就无法运行 sbt。这是我在删除线后看到的内容。

[info] Set current project to search-hadoop (in build file:/Users/lanny/work/IdeaProjects/Search/)
> inspect assembly::test
[info] Task: Unit
[info] Description:
[info]  Executes all tests.
[info] Provided by:
[info]  {file:/Users/lanny/work/IdeaProjects/Search/}hadoop/*:assembly::test
[info] Defined at:
[info]  (sbtassembly.AssemblyPlugin) AssemblyPlugin.scala:32
[info] Dependencies:
[info]  hadoop/test:test
[info] Reverse dependencies:
[info]  hadoop/*:assemblyPackageScala::test
[info]  hadoop/*:assemblyPackageDependency::test
[info]  hadoop/*:assembly
[info] Delegates:
[info]  hadoop/*:assembly::test
[info]  hadoop/*:test
[info]  {.}/*:assembly::test
[info]  {.}/*:test
[info]  */*:assembly::test
[info]  */*:test
[info] Related:
[info]  test/*:assemblyPackageDependency::test
[info]  third_party/test:test
[info]  third_party/*:assemblyPackageDependency::test
[info]  search/*:assembly::test
[info]  search/*:assemblyPackageScala::test
[info]  server/*:assemblyPackageDependency::test
[info]  search/*:assemblyPackageDependency::test
[info]  server/test:test
[info]  hadoop/test:test
[info]  hadoop/*:assemblyPackageScala::test
[info] ...

【问题讨论】：

标签： sbt sbt-assembly

【解决方案1】：

sbt.Keys.test in assembly := {}

成功了。

【讨论】：

【解决方案2】：

如documentation 中所述，对于 sbt 0.13.6+，将此行添加到您的 project/assembly.sbt

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.2")

【讨论】：