Test that detect_file_type() correctly identifies all supported list formats.

-- Testcase --
import adb from 'adblock-fast';
import { writefile, mkdir } from 'fs';
let ti = adb._test_internals;

adb.env.load_config();

let test_dir = '' + TESTDIR + '/fmt_test';
mkdir(test_dir);

let tests = [
	['domains', 'example.com\nad.tracker.net\nmalware.bad.org\n'],
	['hosts', '0.0.0.0 example.com\n127.0.0.1 tracker.net\n0.0.0.0 malware.org\n'],
	['adblockplus', '[Adblock Plus]\n||example.com^\n||tracker.net^\n'],
	['dnsmasq', 'server=/example.com/\nserver=/tracker.net/\n'],
];

let results = [];

for (let t in tests) {
	let name = t[0];
	let content = t[1];
	let path = test_dir + '/' + name + '.txt';
	writefile(path, content);
	let detected = ti.detect_file_type(path);
	if (detected == name)
		push(results, sprintf('%s: PASS', name));
	else
		push(results, sprintf('%s: FAIL (detected as %s)', name, detected));
}

print(join('\n', results) + '\n');
-- End --

-- Expect stdout --
domains: PASS
hosts: PASS
adblockplus: PASS
dnsmasq: PASS
-- End --