Scala library available in both compile and test configuration - scala

Question

I have a library that I wish to expose in both the unit tests in Scala and the code itself.
In sbt, I added my library dependency with configuration "test" and then it's available for tests but I cannot use it in the code. If I leave the configuration be or add "compile" it's not available to be imported in unit tests.
libraryDependencies ++= Seq(
"org.scalacheck" %% "scalacheck" % "1.14.0",
"org.scalatest" %% "scalatest" % "3.0.6" % "test",
"org.scalactic" %% "scalactic" % "3.0.6" % "test")
The main problem is that I expose an abstract class I want to use all over the place in other code: abstract class UnitSpec extends FlatSpec with Matchers with ScalaCHeckDrivenPropertyChecks and also use in the tests of the library. If I add "test" to ScalaCheck it cannot find it in the main code of the library. If I leave it as is, it cannot from org.scalatestplus.scalacheck.ScalaCheckDrivenPropertyChecks. This used to be OK and work fine with 3.0.5 and GeneratorDrivenProperyChecks but that's been deprecated.
Is there a way to achieve what I want? I tried "test->compile" but that also doesn't do what I had hoped...

Answer 1

You can combine configurations. In order to have a library both in compile and test you just add bot configurations.
// wrong: libraryDependencies += "<organization>" %% "<module>" % "<version>" % "compile->compile" % "test->compile"
The syntax means roughly: project configuration dependsOn(->) configuration of libraryDependency.
Update
You can also add the dependency twice with different configurations.
libraryDependencies += "<organization>" %% "<module>" % "<version>",
libraryDependencies += "<organization>" %% "<module>" % "<version>" % "test"
Update 2
I think the syntax in the first example is not what I meant to provide.
libraryDependencies += "<organization>" %% "<module>" % "<version>" % "compile->compile;test->compile"
At least that is what I use in my libraryDependencies.

Answer 2

So you need a trait from the Scalatest JAR in non-test code. I am not sure why it worked before, but it would make sense to me just to remove % "test" from the scalatest dependency. That will make it available in compile and everything from compile is available in test too.
And for Scalactic I think the main use-case for it as a separate dependency is when you need it in compile but only use Scalatest in test (or don't use it at all). If they are both needed for tests only (or for compile), Scalatest will bring Scalactic with it.
I tried "test->compile" but that also doesn't do what I had hoped...
"test->compile" is the same as "test":
A configuration without a mapping (no "->") is mapped to "default" or "compile". The -> is only needed when mapping to a different configuration than those.