Illustrating flexible test object creation using named parameters, option monads, and list flattening

scalatestobject.scala

// This just illustrates some nice aspects of the Option type with List and 'flatten' as well as named parameters

// Some "complex" object here
val defaultSubField1: SubField = ...
val defaultSubField2: SubField = ...
val defaultSubField3: SubField = ...

def createTestComposite(identifier: String = "default", something: Boolean = true,
                        subField1: Option[SubField] = Some(defaultSubField1),
                        subField2: Option[SubField] = Some(defaultSubField2),
                        subField3: Option[SubField] = Some(defaultSubField3),) = {
  CompositeClass(identifier, something, List(subField1, subField2, subField3).flatten)
}

val fullyDefaulted = createTestComposite()
val somethingIsFalse = createTestComposite(something = false)
val noSubField2AndDifferentId = createTestComposite(subField2 = None, identifier = "42")