var test = require('../util/test')(__filename);

var shuffle = require('../../packages/array-shuffle');

var compare = require('../../packages/collection-compare');

test('returns elements, randomly sorted', function(t) {

t.plan(2);

var arr = [1, 2, 3, 4, 5];

var shuffled = shuffle(arr);

t.equal(arr.length, shuffled.length);

t.ok(compare(arr.sort(), shuffled.sort()));

t.end();

});

test('returns duplicate when array has 0 or 1 element', function(t) {

t.plan(2);

var arr = [1];

var shuffled = shuffle(arr);

t.ok(compare(arr, shuffled));

var arr2 = [];

var shuffled2 = shuffle(arr2);

t.ok(compare(arr2, shuffled2));

t.end();

});

test('non-array arguments throw', function(t) {

t.plan(4);

t.throws(function() {

shuffle({});

});

t.throws(function() {

shuffle(undefined);

});

t.throws(function() {

shuffle(null);

});

t.throws(function() {

shuffle();

});

t.end();

});