const expect = require('expect');
const everyNth = require('./everyNth.js');

test('everyNth is a Function', () => {
  expect(everyNth).toBeInstanceOf(Function);
});
test('Returns every nth element in an array', () => {
  expect(everyNth([1, 2, 3, 4, 5, 6], 2)).toEqual([ 2, 4, 6 ]);
});