Mockito gotcha: full test

MyServiceSpec.scala

class MyServiceSpec extends FlatSpec with Matchers with MockitoSugar with BeforeAndAfter {

 private val dependency: MyOtherService = mock[MyOtherService]
 private val underTest = new MyService(dependency)

 before { // default for most tests:
   when(dependency.getValue(any())).thenAnswer(answerSizeOfInputPlus(2))
 }

 "MyService.testedMethod" should "return output from getValue plus one" in {
   // override default for this test: 
   when(dependency.getValue(any())).thenAnswer(answerSizeOfInputPlus(3))
   underTest.testedMethod("Hello") shouldBe 5 + 3 + 1
 }

 private def answerSizeOfInputPlus(add: Int): Answer[Int] = invocation => {
   val inputArg: String = invocation.getArgumentAt(0, classOf[String])
   inputArg.length + add
 }
}