How to include test dependencies in sbt-assembly jar? - scala

Question

I am unable to package my test dependencies in my test assembly jar. Here is an excerpt from my build.sbt:
...
name := "project"
scalaVersion := "2.10.6"
assemblyOption in (Compile, assembly) := (assemblyOption in (Compile, assembly)).value.copy(includeScala = false)
fork in Test := true
parallelExecution in IntegrationTest := false
lazy val root = project.in(file(".")).configs(IntegrationTest.extend(Test)).settings(Defaults.itSettings: _ *)
Project.inConfig(Test)(baseAssemblySettings)
test in (Test, assembly) := {}
assemblyOption in (Test, assembly) := (assemblyOption in (Test, assembly)).value.copy(includeScala = false, includeDependency = true)
assemblyJarName in (Test, assembly) := s"${name.value}-test.jar"
fullClasspath in (Test, assembly) := {
val cp = (fullClasspath in Test).value
cp.filter{ file => (file.data.name contains "classes") || (file.data.name contains "test-classes")} ++ (fullClasspath in Runtime).value
}
libraryDependencies ++= Seq(
...
"com.typesafe.play" %% "play-json" % "2.3.10" % "test" excludeAll ExclusionRule(organization = "joda-time"),
...
)
...
When I assemble my fat jar using sbt test:assembly, is produces the fat jar project-test.jar, but the play-json dependencies aren't being packaged in:
$ jar tf /path/to/project-test.jar | grep play
$
However, if I remove the "test" configuration from the play-json dep (i.e. "com.typesafe.play" %% "play-json" % "2.3.10" excludeAll ExclusionRule(organization = "joda-time")), I can see it being included:
$ jar tf /path/to/project-test.jar | grep play
...
play/libs/Json.class
...
$
Am I doing anything wrong and/or missing anything? My goal here is to include the play-json library in ONLY the test:assembly jar and NOT the assembly jar

Answer 1

I have left out a crucial part in the original build.sbt excerpt I posted above which turned out to be the cause of the issuse:
fullClasspath in (Test, assembly) := {
val cp = (fullClasspath in Test).value
cp.filter{ file => (file.data.name contains "classes") || (file.data.name contains "test-classes")} ++ (fullClasspath in Runtime).value
}
This code block was essentially filter out deps from the test classpath. We include this to avoid painful merge conflicts. I fixed this by adding logic to include the play-json dep that was needed:
fullClasspath in (Test, assembly) := {
val cp = (fullClasspath in Test).value
cp.filter{ file =>
(file.data.name contains "classes") ||
(file.data.name contains "test-classes") ||
// sorta hacky
(file.data.name contains "play")
} ++ (fullClasspath in Runtime).value
}