#! /usr/bin/env groovyt

//import static org.testng.Assert.assertEquals
import org.testng.Assert

class Factorial_BigInteger_TestNGroove {
  def data = [
              [ 0 , 1 ] ,
              [ 1 , 1 ] ,
              [ 2 , 2 ] ,
              [ 3 , 6 ] ,
              [ 4 , 24 ] ,
              [ 5 , 120 ] ,
              [ 6 , 720 ] ,
              [ 7 , 5040 ] ,
              [ 8 , 40320 ] ,
              [ 9 , 362880 ] ,
              [ 10 , 3628800 ] ,
              [ 11 , 39916800 ] ,
              [ 12 , 479001600 ] ,
              [ 13 , 6227020800G ] , // Have to force the correct type here for some reason.
              [ 14 , 87178291200G ] , // Have to force the correct type here for some reason.
              [ 20 , 2432902008176640000G ] , // Have to force the correct type here for some reason.
              [ 30 , 265252859812191058636308480000000 ] ,
              [ 40 , 815915283247897734345611269596115894272000000000 ]
              ]
  @Test void correctIterative ( ) { data.each { datum -> Assert.assertEquals ( datum[1] , Factorial_BigInteger.iterative ( datum[0] ) ) } }  
  @Test void correctRecursive ( ) { data.each { datum -> Assert.assertEquals ( datum[1] , Factorial_BigInteger.recursive ( datum[0] ) ) } }  
  @Test ( expectedExceptions = [ RuntimeException ] ) void negativeIterative ( ) { ( -20 .. -1 ).each { i -> Factorial_BigInteger.iterative ( i ) } }
  @Test ( expectedExceptions = [ RuntimeException ] ) void negativeRecursive ( ) { ( -20 .. -1 ).each { i -> Factorial_BigInteger.recursive ( i ) } }
  @Test ( expectedExceptions = [ MissingMethodException ] ) void floatingPointIterative ( ) { ( -12 .. 2 ).each { i -> Factorial_BigInteger.iterative ( i + 0.5 ) } }
  @Test ( expectedExceptions = [ MissingMethodException ] ) void floatingPointRecursive ( ) { ( -12 .. 2 ).each { i -> Factorial_BigInteger.recursive ( i + 0.5 ) } }
}