How to run task before all tests from all modules in sbt - scala

Question

I have a multi-module Play! application built with sbt and I have a problem on CI server with parallel tests and evolutions: when sbt starts tests and first starts evolution script, other fails because of "Database 'default' is in inconsistent state" for a while (until evolution script stops).
I know how to execute evolutions manually and how to run them from sbt, but I don't know how can I plug this configuration to sbt to ensure evolutions are applied only once and before all tests from all modules.
For reference I'm using following for running evolutions:
object ApplyEvolutions extends App {
OfflineEvolutions.applyScript(
new File("."),
this.getClass.getClassLoader,
args.headOption.getOrElse("default"))
}
And my sbt settings:
val runEvolution = taskKey[Unit]("Applies evolutions")
lazy val runEvolutionTask = runEvolution := {
val log = streams.value.log
val dbName = "default"
Run.executeTrapExit( {
log.info(s"Applying evolutions for database $dbName")
Run.run("controllers.ApplyEvolutions",
(fullClasspath in Compile).value.map { _.data },
Seq(dbName),
log
)(runner.value)
}, log )
}
lazy val runEvolutionsBeforeTests = Seq(
Tasks.runEvolutionTask,
(test in Test) <<= (test in Test) dependsOn Tasks.runEvolution
)

Answer 1

tl;dr Use alias
I use SBT 0.13.2-M3.
[task-dependson]> about
[info] This is sbt 0.13.2-M3
[info] The current project is {file:/Users/jacek/sandbox/so/task-dependsOn/}task-dependson 0.1-SNAPSHOT
[info] The current project is built against Scala 2.10.3
[info] Available Plugins: sbt.plugins.IvyModule, sbt.plugins.JvmModule, sbt.plugins.GlobalModule, com.typesafe.sbt.SbtGit, com.typesafe.sbt.SbtProguard, growl.GrowlingTests, org.sbtidea.SbtIdeaPlugin, sbtman.Plugin, np.Plugin, com.timushev.sbt.updates.UpdatesPlugin
[info] sbt, sbt plugins, and build definitions are using Scala 2.10.3
Here's an example of a task - sayHelloT - that's executed once before test in all subprojects. I use Specs2 as the testing framework.
import java.util.concurrent._
lazy val a = project
lazy val b = project
lazy val sayHelloT = taskKey[Unit]("Say Hello")
sayHelloT := {
val log = streams.value.log
log.info("Sleeping for 5 secs...")
TimeUnit.SECONDS.sleep(5)
log.info("Hello, my friend")
}
libraryDependencies in ThisBuild += "org.specs2" %% "specs2" % "2.3.10" % "test"
scalacOptions in Test ++= Seq("-Yrangepos")
addCommandAlias("sht", ";sayHelloT; test")
As you can see there are two subprojects - a and b - and a single alias sht that will execute sayHelloT and only after it finishes successfully which takes 5 secs, test kicks in.
[task-dependson]> sht
[info] Sleeping for 5 secs...
[info] Hello, my friend
[success] Total time: 5 s, completed Mar 12, 2014 10:19:39 PM
[info] ASpec
[info]
[info] A project should
[info] + contain 11 characters
[info]
[info] Total for specification ASpec
[info] Finished in 205 ms
[info] 1 example, 0 failure, 0 error
[info] Passed: Total 0, Failed 0, Errors 0, Passed 0
[info] No tests to run for task-dependson/test:test
[info] Passed: Total 1, Failed 0, Errors 0, Passed 1
[info] BSpec
[info]
[info] B project should
[info] + contain 11 characters
[info]
[info] Total for specification BSpec
[info] Finished in 240 ms
[info] 1 example, 0 failure, 0 error
[info] Passed: Total 1, Failed 0, Errors 0, Passed 1
[success] Total time: 3 s, completed Mar 12, 2014 10:19:42 PM