test.js

import test from 'ava';
import mock from 'xhr-mock';
import noInternet from './src/no-internet';
import SetInterval from 'set-interval';
import browserEnv from 'browser-env';
browserEnv(['window', 'document', 'navigator', 'XMLHttpRequest']);

const URL = 'https://www.google.com/favicon.ico';

test.before(t => {
	mock.setup();
	mock.get(URL, function (req, res) {
		return res.status(200)
	});
});

test('module should be a function', t => {
	t.is(typeof noInternet, 'function');
});

// TODO: check Travis configuration for HTTP request
// test('one check', t => {
//     return noInternet({ url: URL }).then(offline => {
//         t.false(offline);
//     });
// });

test.cb('interval checking', t => {
	const options = {
		url: URL,
		callback: noInternetCallback,
		headers: { 'Access-Control-Allow-Origin': '*' }
	};

	noInternet(options);

	function noInternetCallback(offline) {
		t.false(offline);
	}

	setTimeout(t.end);
});

test.cb('should clear interval checking', t => {
	const options = {
		url: URL,
		callback: () => { }
	};

	noInternet(options);
	noInternet.clearInterval();

	t.is(SetInterval.key['checkConnection'], void 0);

	setTimeout(t.end);
});

test('invalid URL', t => {
	return noInternet().then(offline => {
		t.true(offline);
	});
});