ScalaTest on sbt not running any tests - scala

Question

I am trying to run my tests with:
sbt and then test.
My build.sbt looks like this
lazy val scalatest = "org.scalatest" % "scalatest_2.11" % "2.2.4" % "test"
lazy val root = (project in file(".")).
settings(
name := "highlight2pdf",
version := "0.1",
scalaVersion := "2.11.6",
libraryDependencies += scalatest
)
And i just put the example test on test/scala
import collection.mutable.Stack
import org.scalatest._
class ExampleSpec extends FlatSpec with Matchers {
"A Stack" should "pop values in last-in-first-out order" in {
val stack = new Stack[Int]
stack.push(1)
stack.push(2)
stack.pop() should be (2)
stack.pop() should be (1)
}
it should "throw NoSuchElementException if an empty stack is popped" in {
val emptyStack = new Stack[Int]
a [NoSuchElementException] should be thrownBy {
emptyStack.pop()
}
}
}
Still it always show:
[info] No tests were executed.
Any thoughts on why it's not working?

Answer 1

The directory structure isn't the correct convention for sbt to find ExampleSpec.scala by default.
├── built.sbt
├── src
│   └── test
│   └── scala
│   ├── ExampleSpec.scala
Change it to the structure above and run sbt test in the top level directory and it should work. Likewise, scala source would go in src/main/scala and would get compiled.
> test
[info] Compiling 1 Scala source to /tmp/TestsWontRun/target/scala-2.11/test-classes...
[info] ExampleSpec:
[info] A Stack
[info] - should pop values in last-in-first-out order
[info] - should throw NoSuchElementException if an empty stack is popped
[info] Run completed in 289 milliseconds.
[info] Total number of tests run: 2
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 2, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[success] Total time: 7 s, completed Apr 30, 2015 8:54:30 AM