package spec.perfectnumber

import perfectnumber._
import org.specs._
import org.junit.runner.RunWith
import org.specs.runner.JUnitSuiteRunner

class PerfectNumberSpec extends SpecificationWithJUnit {

  "Examples of when a number" should {
    val isPerfect: (Int => Boolean) = new PerfectNumberFinder().isPerfect(_)
    "be perfect" in {
      "when sum of divisors equal the number" in {
        "6" in {
          isPerfect(6) must be(true)
        }
        "28" in {
          isPerfect(28) must be(true)
        }
        "496" in {
          isPerfect(496) must be(true)
        }
      }

    }
    "not be perfect" in {
      "when divisiors of number don't add up to number" in {
        "5" in {
          isPerfect(10) must be(false)
        }
      }
      "when the number is zero" in {
        isPerfect(0) must be(false)
      }
      "when the number is negative" in {
        isPerfect(-28) must be(false)
      }
    }
  }

}