How to use JUnit's #Rule annotation with Scala Specs2 tests? - scala

Question

In our project we use Scala Specs2 together with Selenium.
I'm trying to implement screenshot-on-failure mechanism "in a classic way (link)" for my tests, using JUnit annotations, but, the rule doesn't called on test failure at all.
The structure of the test is as follows:
class Tests extends SpecificationWithJUnit{
trait Context extends LotsOfStuff {
#Rule
val screenshotOnFailRule = new ScreenshotOnFailRule(driver)
}
"test to verify stuff that will fail" should {
"this test FAILS" in new Context {
...
}
}
The ScreenshotOnFailRule looks like this:
class ScreenshotOnFailRule (webDriver: WebDriver) extends TestWatcher {
override def failed(er:Throwable, des:Description) {
val scrFile = webDriver.asInstanceOf[TakesScreenshot].getScreenshotAs(OutputType.FILE)
FileUtils.copyFile(scrFile, new File(s"/tmp/automation_screenshot${Platform.currentTime}.png"))
}
}
I understand that probably it doesn't work now because the tests aren't annotated with #Test annotation.
Is it possible to annotate the Specs2 tests with JUnit #Rule annotation?

Answer 1

According to this question it seems as if JUnit Rules aren't supported. But you could try to make use of the AroundExample trait:
import org.specs2.execute.{AsResult, Result}
import org.specs2.mutable._
import org.specs2.specification.AroundExample
class ExampleSpec extends Specification with AroundExample {
// execute tests in sequential order
sequential
"The 'Hello world' string" should {
"contain 11 characters" in {
"Hello world" must have size (10)
}
// more tests..
}
override protected def around[T](t: => T)(implicit ev: AsResult[T]): Result = {
try {
AsResult.effectively(t)
} catch {
case e: Throwable => {
// take screenshot here
throw e
}
}
}
}