How Can I Share Code Between Integration Tests and Unit Tests

Question

For my tests I have created an object which holds all my Arbitrary instances of case classes (ie my generators):

object Generators
    extends
    FooGen
  {


  def sample[A](implicit gen: Gen[A]): A =
    gen.sample.getOrElse(sys.error(s"Could not generate instance with $gen"))

  implicit def arb[A](implicit g: Gen[A]): Arbitrary[A] = Arbitrary(g)

}

trait FooGen { this: GenUtils =>

  implicit val fooGen: Gen[Foo] = gen[Foo]

}

This currently sits under my /test folder as I need it to generate arbitrary instances of my cases classes for my unit tests. But now I want to create some integration tests which will be under my /it folder. What is the best way to share this generator file in my /test folder with my tests in /it folder?

I will have lots of these generators for all my case classes so I don't want to duplicate the code so that is why I am asking.

Answer 1

Based on gilad hoch's answer try

IntegrationTest / dependencyClasspath := 
  (IntegrationTest / dependencyClasspath).value ++ (Test / exportedProducts).value

for example your build.sbt might look like

lazy val root = (project in file("."))
  .configs(IntegrationTest)
  .settings(
    Defaults.itSettings,
    libraryDependencies += scalaTest % "it,test",
    IntegrationTest / dependencyClasspath :=
      (IntegrationTest / dependencyClasspath).value ++ (Test / exportedProducts).value
  )

and the directory structure

├── it
│   └── scala
│       └── example
│           └── GoodbyeSpec.scala
├── main
│   └── scala
│       └── example
│           └── Hello.scala
└── test
    └── scala
        └── example
            ├── FooGen.scala
            └── HelloSpec.scala

so now FooGen.scala is accessible from GoodbyeSpec.scala.

Another option is creating a multi-project build and factor out common test code into its own project, perhaps test-common, and then have the main project depend on it

lazy val core = (project in file("core"))
  .dependsOn(testCommon)
  .settings(
    // other settings
  )

lazy val testCommon = (project in file("testCommon"))
  .settings(
    // other settings
  )