Reuse mock declaration across tests - scala

Question

I'd like to reuse mock declarations accross tests (if possible).
Here is a minimal non-working example using ScalaTest and Mockito. I'm expecting the ​yes​ value in the first test but I get the ​other​ value.
It seems that the latest Mockito.when is the one applied for all test clauses.
Is there a way to avoid declaring mocks in each in clause?
import org.mockito.Mockito._
import org.scalatest.mock.MockitoSugar
import org.scalatest.{Matchers, WordSpec}
​
class ReuseMocksSpec extends WordSpec with Matchers with MockitoSugar {
"A test" when {
val service = mock[Service]
"sharing mocks among tests" should {
when(service.getVal).thenReturn("yes")
"get yes value" in {
service.getVal should be("yes")
}
}
"sharing mocks among other tests" should {
when(service.getVal).thenReturn("other")
"get other value" in {
service.getVal should be("other")
}
}
}
​
trait Service {
def getVal: String
}
}

Answer 1

I reviewed the way I designed it and am now using a function to build my mocks:
def withValue(value: String)(body: (Service => String)) = {
val service = mock[Service]
when(service.getVal).thenReturn(value)
body(service)
}
The test class would become:
import org.mockito.Mockito._
import org.scalatest.mock.MockitoSugar
import org.scalatest.{Matchers, WordSpec}
class ReuseMocksSpec extends WordSpec with Matchers with MockitoSugar {
"A test" when {
"sharing mocks among tests" should {
"get yes value" in {
val value = withValue("yes") { service =>
service.getVal
}
value should be("yes")
}
}
"sharing mocks among other tests" should {
"get other value" in {
val value = withValue("other") { service =>
service.getVal
}
value should be("other")
}
}
}
def withValue(value: String)(body: (Service => String)) = {
val service = mock[Service]
when(service.getVal).thenReturn(value)
body(service)
}
trait Service {
def getVal: String
}
}
I don't know if it's the cleanest and easiest way to do it but it works...