How to use JUnit 5's #BeforeAll in Scala - scala

Question

Junit5 has introduced #BeforeAll to signal that the annotated method should be executed before all tests in the current test class. However it has requirement of method being static.
I have following structure in my Scala test suite:
class BaseTest extends MockitoSugar {
#BeforeAll
def codeNeedeForAllTests() = { <== this does not work as as it is not static
println("calling codeNeedeForAllTests")
// other code
}
}
and other test classes:
class IndexerTest extends BaseTest {
#Test
def add() = {
//test code
}
}
So I want that codeNeedeForAllTests get called before all tests, however the catch is #BeforeAll's requirement of method being static, for which I need to make codeNeedeForAllTests as object to have static method in Scala.
Now in Scala, a class can not extend an object and and object also can not extend object.
I also tried creating companion object of BaseTest, but that also did not work, any clean approach to do this?

Answer 1

#BeforeAll methods in JUnit Jupiter (a.k.a., JUnit 5) do not have to be static.
The link you provided is to JUnit 4.
This link is to JUnit Jupiter.
Excerpt:
Denotes that the annotated method should be executed before all #Test, #RepeatedTest, #ParameterizedTest, and #TestFactory methods in the current class; analogous to JUnit 4’s #BeforeClass. Such methods are inherited (unless they are hidden or overridden) and must be static (unless the "per-class" test instance lifecycle is used).
And that links to the documentation on Test Instance Lifecycle.
Thus, you should be able to annotate your test class with #TestInstance(Lifecycle.PER_CLASS) and declare your #BeforeAll method as non-static.

Answer 2

You can do this with FunCpec.
package net
import org.scalatest._
class Test extends FunSpec with BeforeAndAfterAll {
override def beforeAll: Unit = {
println("beforeAll")
}
describe("running a test") {
println("in describe")
it("should do something") {
println("in my test")
assert(true)
}
}
}
If u'll test it in REPL:
scala> test
[info] Compiling 1 Scala source to /Users/kmmere/Workspace/Work/scalatest_before/target/scala-2.11/test-classes...
in describe
beforeAll
in my test
[info] Test:
[info] running a test
[info] - should do something
[info] Run completed in 99 milliseconds.
[info] Total number of tests run: 1
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 1, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[success] Total time: 1 s, completed Oct 19, 2015 4:32:56 PM
Don't forget to include dependency of scalatest in yor build.sbt file:
"org.scalatest" %% "scalatest" % "3.2.0-SNAP10" % Test
class FunSpec - facilitates a “behavior-driven” style of development (BDD), in which tests are combined with text that specifies the behavior the tests verify.
Recommended Usage: For teams coming from Ruby's RSpec tool, FunSpec will feel familiar and comfortable; More generally, for any team that prefers BDD, FunSpec's nesting and gentle guide to structuring text (with describe and it) provide an excellent general-purpose choice for writing specification-style tests.