/*
 * Copyright (C) 2007-2017, GoodData(R) Corporation. All rights reserved.
 */
@Grab("org.spockframework:spock-core")
import spock.lang.*

@Unroll
class ExampleSpec extends Specification {
    def "should throw"() {
        when: roman(-1)
        then: thrown(IllegalArgumentException)
    }

    def "roman number for #a is #r"() {
      expect:
      roman(a) == r

      where:
       a || r
       0 || ""
       1 || "I"
       4 || "IV"
      10 || "X"
    }

    String roman(int arabic) {
      if(arabic < 0) throw new IllegalArgumentException("no negative numbers")
      if(arabic == 0) return ""
      if(arabic == 1) return "I"

      def conversion = [2: "II", 3: "III", 4: "IV"]

      conversion.get(arabic) ?: "X"
    }
}