var assert = require('assert');

var factorial = require('../../solutions/javascript/factorial');

describe('factorial', function () {

// We have multiple factorial solutions to test, so loop through them

Object.keys(factorial).forEach(function (name) {

// Set the value in the object as the current solution to work against

var solution = factorial[name];

// Use the name as part of the assertion name

it(name + ' solution returns factorials', function () {

// Bunch of simple assertions we know to be true

assert.equal(solution(1), 1);

assert.equal(solution(2), 2);

assert.equal(solution(3), 6);

assert.equal(solution(4), 24);

assert.equal(solution(5), 120);

assert.equal(solution(6), 720);

assert.equal(solution(7), 5040);

assert.equal(solution(8), 40320);

assert.equal(solution(9), 362880);

assert.equal(solution(10), 3628800);

assert.equal(solution(11), 39916800);

assert.equal(solution(12), 479001600);

assert.equal(solution(13), 6227020800);

assert.equal(solution(14), 87178291200);

assert.equal(solution(15), 1307674368000);

assert.equal(solution(16), 20922789888000);

assert.equal(solution(17), 355687428096000);

assert.equal(solution(18), 6402373705728000);

assert.equal(solution(19), 121645100408832000);

assert.equal(solution(20), 2432902008176640000);

});

});

});