確保'重新啓動'任務自動運行之前：測試

Question

是否有可能在運行IntegrationTest目標（it:test）之前讓re-start（又名重啓）任務自動運行？

我認爲這將做到這一點：

test <<= (test in IntegrationTest) dependsOn reStart 

不過，我得到這個錯誤：

build.sbt:54: error: not found: value reStart 
test <<= (test in IntegrationTest) dependsOn reStart 
              ^
[error] Type error in expression 

通過添加import Revolver._我遠一點，但它仍然失敗。現在我得到一個更具描述性的錯誤，但是：

build.sbt:55: error: type mismatch; 
found : sbt.InputKey[spray.revolver.AppProcess] 
required: sbt.Scoped.AnyInitTask 
    (which expands to) sbt.Def.Initialize[sbt.Task[T]] forSome { type T } 
test in IntegrationTest <<= (test in IntegrationTest) dependsOn reStart 

有沒有辦法解決這個問題？

Answer 1

可以定義爲這樣的特殊TaskKey -typed任務（working example）：

lazy val reStart0 = TaskKey[AppProcess]("re-start-0") 
lazy val emptyArgs = SettingKey[revolver.Actions.ExtraCmdLineOptions]("empty-args") 

lazy val projectA = Project(
    id = "hello-a", 
    base = file("./a"), 
    settings = Project.defaultSettings ++ Revolver.settings 
).settings(
    emptyArgs := revolver.Actions.ExtraCmdLineOptions(Nil, Nil), 
    reStart0 <<= { 
    (streams, Revolver.reLogTag, thisProjectRef, Revolver.reForkOptions, mainClass in Revolver.reStart, fullClasspath in Runtime, Revolver.reStartArgs, emptyArgs) 
    .map(revolver.Actions.restartApp) 
    .dependsOn(products in Compile) 
    } 
) 

lazy val projectB = Project(
    id = "hello-b", 
    base = file("./b"), 
    settings = Project.defaultSettings ++ Revolver.settings ++ Defaults.itSettings) 
.configs(IntegrationTest) 
.settings(
    test in (IntegrationTest) <<= (test in IntegrationTest).dependsOn(reStart0 in projectA) 
)