sbt - Why does setting (test in assembly) give type error? -

i'm using sbt 0.13.8 , sbt-assembly 0.13.0 in multi-module project. works great until try turn off tests during assembly.

as instructed in docs add line

test in assembly := {} 

in settings of 1 of modules , following error

/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 

i'd happy show results of 'inspect test' alas, cannot run sbt without removing line causing error. here's see line removed.

[info] set current project search-hadoop (in build file:/users/lanny/work/ideaprojects/search/) > inspect assembly::test [info] task: unit [info] description: [info]  executes 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] ... 

sbt.keys.test in assembly := {} 

does trick.