Printable protocol for enum doesn't work in unit tests

It seems that println ignores Printable protocol not only in Playground but in unit tests too. Is it true or I do something wrong?

Here is my code snippet:

class ExampleTests: XCTestCase {

    enum Directions: Printable {
        case North

        var description: String {
            get {
                switch self {
                case .North:
                    return "North"
                }
            }
        }
    }

    override func setUp() {
        let direction = Directions.North
        println(direction)
        super.setUp()
    }
}

In console I see (Enum Value) instead of North.

I could not find the answer in the relevant question into so and tried to google it as well.

Note. If I move this code into my ViewController, it'll work fine. Looks weird for me.