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

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

test('flattened arrays are unchanged', function(t) {

t.plan(1);

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

t.deepEqual(flatten(arr), arr);

t.end();

});

test('unflattened arrays are flattened', function(t) {

t.plan(2);

var arr1 = [1, [2, 3], [4, [5, 6], 7], 8];

t.deepEqual(flatten(arr1), [1, 2, 3, 4, 5, 6, 7, 8]);

var arr2 = [{a: 4}, [{b: 5}, {c: false}], {d: 'd'}];

t.deepEqual(flatten(arr2), [{a: 4}, {b: 5}, {c: false}, {d: 'd'}]);

t.end();

});

test('throws on non-arrays return an empty array', function(t) {

t.plan(3);

t.throws(function() {

flatten({n: 4});

});

t.throws(function() {

flatten(2);

});

t.throws(function() {

flatten(undefined);

});

t.end();

});