Make tests in multi project sbt projects run only if tests pass in dependent projects - scala

Question

Assuming a multiproject SBT project with a foo-project and bar-project, such that foo-project depends on bar-project for code etc.
I would like tests in foo-project to run iff the tests in bar-project pass.
How?

Answer 1

You may provide explicit dependencies between projects. For example root -> A -> B
Test case on GitHub. Project definition:
val commonSettings = Seq(libraryDependencies += "org.scalatest" %% "scalatest" % "1.9.1")
lazy val a: Project = (project in file("a")) settings(commonSettings: _*) settings(
name := "a",
test in Test <<= test in Test dependsOn (test in Test in b)
)
lazy val b: Project = (project in file("b")) settings(commonSettings: _*) settings(
name := "b"
)
lazy val root: Project = (project in file(".")) settings(commonSettings: _*) settings(
name := "root",
test in Test <<= test in Test dependsOn (test in Test in a)
)
Beginning from B and complete them successful:
ezh#mobile ZZZZZZ % sbt-0.13
[info] Set current project to root (in build file:/home/ezh/ZZZZZZ/)
> root/test
[info] Compiling 1 Scala source to /home/ezh/ZZZZZZ/b/target/scala-2.10/test-classes...
[info] TestSpecB:
[info] This test
[info] - should fail
[info] Passed: Total 1, Failed 0, Errors 0, Passed 1
[info] Compiling 1 Scala source to /home/ezh/ZZZZZZ/a/target/scala-2.10/test-classes...
[info] TestSpecA:
[info] This test
[info] - should succeed
[info] Passed: Total 1, Failed 0, Errors 0, Passed 1
[info] Passed: Total 0, Failed 0, Errors 0, Passed 0
[info] No tests to run for root/test:test
[success] Total time: 5 s, completed 28.11.2013 16:20:12
Beginning from B but fail:
ezh#mobile ZZZZZZ % sbt-0.13
[info] Set current project to root (in build file:/home/ezh/ZZZZZZ/)
> test
[info] Compiling 1 Scala source to /home/ezh/ZZZZZZ/b/target/scala-2.10/test-classes...
[info] TestSpecB:
[info] This test
[info] - should fail *** FAILED ***
[info] 2 did not equal 3 (Test.scala:5)
[error] Failed: Total 1, Failed 1, Errors 0, Passed 0
[error] Failed tests:
[error] TestSpecB
[error] (b/test:test) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 3 s, completed 28.11.2013 16:20:35
>

Answer 2

as already noted this is probably evil, however this should probably work:
import sbt._
import sbt.Keys._
object Build extends Build {
lazy val projectA = project
lazy val myTest = taskKey[Seq[Option[Tests.Output]]]("my test")
lazy val root: Project = project in file(".") settings (myTest <<= myTestTask) dependsOn projectA
def myTestTask = Def.task {
val state: State = Keys.state.value
val log: Logger = streams.value.log
val extracted = Project.extract(state)
import extracted._
def noTestsMessage(scoped: ScopedKey[_])(implicit display: Show[ScopedKey[_]]): String =
"No tests to run for " + display(scoped)
def f(ref: ProjectReference) = for {
state Pair Value(r) <- Project.runTask(executeTests in(ref, Test), state)
_ = Tests.showResults(log, r, noTestsMessage(test in ref))
} yield r
val depsTests = currentProject.dependencies.map(_.project).map(f)
val passed = depsTests.forall(_.forall(_.overall == TestResult.Passed))
if (passed) depsTests :+ f(ThisProject) else depsTests
}
}
http://scastie.org/3319