#! /usr/bin/env groovyt

import static org.testng.Assert.assertEquals

class Factorial_J_BigInteger_TestNGroove {
  @DataProvider ( name = "theData" ) public Object[][] createData ( ) {
    [
     [ 0G , 1G ] ,
     [ 1G , 1G ] ,
     [ 2G , 2G ] ,
     [ 3G , 6G ] ,
     [ 4G , 24G ] ,
     [ 5G , 120G ] ,
     [ 6G , 720G ] ,
     [ 7G , 5040G ] ,
     [ 8G , 40320G ] ,
     [ 9G , 362880G ] ,
     [ 10G , 3628800G ] ,
     [ 11G , 39916800G ] ,
     [ 12G , 479001600G ] ,
     [ 13G , 6227020800G ] ,
     [ 14G , 87178291200G ] ,
     [ 20G , 2432902008176640000G ] ,
     [ 30G , 265252859812191058636308480000000G ] ,
     [ 40G , 815915283247897734345611269596115894272000000000G ]
     ] as Object[][]
  }
  @Test ( dataProvider = "theData" ) public void correctIterative ( BigInteger n , BigInteger expected ) {
    assertEquals ( expected , Factorial_J_BigInteger.iterative ( n ) ) ;
  }
  @Test ( dataProvider = "theData" ) public void correctRecursive ( BigInteger n , BigInteger expected ) {
    assertEquals ( expected , Factorial_J_BigInteger.recursive ( n ) ) ;
  }
  @Test ( dataProvider = "theData" ) public void correctTailRecursive ( BigInteger n , BigInteger expected ) {
    assertEquals ( expected , Factorial_J_BigInteger.tailRecursive ( n ) ) ;
  }
  @DataProvider ( name = "theNegative" ) public Object[][] createNegative ( ) {
    [ [  -20G ] , [ -15G ] , [ -10G ] , [ -5G ] , [ -2G ] , [ -1G ] ] as Object[][]
  }
  @Test ( dataProvider = "theNegative" , expectedExceptions = [ FactorialIllegalArgumentException ] )
  public void negativeIterative ( BigInteger n ) { Factorial_J_BigInteger.iterative ( n ) ; }
  @Test ( dataProvider = "theNegative" , expectedExceptions = [ FactorialIllegalArgumentException ] )
  public void negativeRecursive ( BigInteger n ) { Factorial_J_BigInteger.recursive ( n ) ; }
  @Test ( dataProvider = "theNegative" , expectedExceptions = [ FactorialIllegalArgumentException ] )
  public void negativeTailRecursive ( BigInteger n ) { Factorial_J_BigInteger.tailRecursive ( n ) ; }
  @Test public void iterativeEnormousSucceeds ( ) { Factorial_J_BigInteger.iterative ( 10000 ) ; }
  @Test ( expectedExceptions = [ StackOverflowError ] ) public void recursiveEnormousSucceeds ( ) { Factorial_J_BigInteger.recursive ( 8500 ) ; }
  @Test ( expectedExceptions = [ StackOverflowError ] ) public void tailRecursiveEnormousSucceeds ( ) { Factorial_J_BigInteger.tailRecursive ( 8700 ) ; }
  @DataProvider ( name = "theFloats" ) public Object[][] createFloats ( ) {
    [ [ -20.5 ] , [ -15.5 ] , [ 10.5 ] , [ 5.5 ] ] as Object[][]
  }
  @Test ( dataProvider = "theFloats" , expectedExceptions = [ MissingMethodException ] )
  public void floatingPointIterative ( n ) { Factorial_J_BigInteger.iterative ( n ) ; }
  @Test ( dataProvider = "theFloats" , expectedExceptions = [ MissingMethodException ] )
  public void floatingPointRecursive ( n ) { Factorial_J_BigInteger.recursive ( n ) ; }
  @Test ( dataProvider = "theFloats" , expectedExceptions = [ MissingMethodException ] )
  public void floatingPointTailRecursive ( n ) { Factorial_J_BigInteger.tailRecursive ( n ) ; }
}