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

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

test('should return empty array if empty array is passed as first arg', function(t) {

t.plan(3);

t.deepEqual(split([]), []);

t.deepEqual(split([], 4), []);

t.deepEqual(split([], null), []);

t.end();

});

test('if only array is passed as argument, treat n as the length of array', function(t) {

t.plan(2);

t.deepEqual(split([1, 2, 3, 4, 5, 6, 7, 8, 9]), [[1, 2, 3, 4, 5, 6, 7, 8, 9]]);

t.deepEqual(split([100, 100, 100, 200, 300, 400]), [[100, 100, 100, 200, 300, 400]]);

t.end();

});

test('splits array into groups of n size if array length divisible by n', function(t) {

t.plan(2);

t.deepEqual(split([1, 2, 3, 4, 5, 6, 7, 8, 9], 3), [[1, 2, 3], [4, 5, 6], [7, 8, 9]]);

t.deepEqual(split([100, 100, 100, 200, 300, 400], 2), [[100, 100], [100, 200], [300, 400]]);

t.end();

});

test('splits array into groups of n size plus a trailing array of length < n', function(t) {

t.plan(2);

t.deepEqual(split([1, 2, 3, 4, 5, 6, 7, 8, 9], 2), [[1, 2], [3, 4], [5, 6], [7, 8], [9]]);

t.deepEqual(split([100, 100, 100, 200, 300, 400], 4), [[100, 100, 100, 200], [300, 400]]);

t.end();

});

test('throws if first argument is not an array', function(t) {

t.plan(3);

t.throws(function() {

split(undefined, 2);

});

t.throws(function() {

split(null, 4);

});

t.throws(function() {

split({}, 3);

});

t.end();

});

test('throws if second argument is not null/undefined or a number', function(t) {

t.plan(2);

t.throws(function() {

split([1, 2, 3, 4], '2');

});

t.throws(function() {

split([1, 2, 3, 4], {});

});

t.end();

});