Test that all 9 DNS modes produce valid output files containing
domains from both the domains.txt and hosts.txt test data files.

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

let modes = [
	'dnsmasq.servers',
	'dnsmasq.conf',
	'dnsmasq.ipset',
	'dnsmasq.nftset',
	'dnsmasq.addnhosts',
	'smartdns.domainset',
	'smartdns.ipset',
	'smartdns.nftset',
	'unbound.adb_list',
];

// Known-good domains that MUST appear in every output
let must_have = [
	'ad.doubleclick.test.example.com',
	'tracker.analytics.test.example.com',
	'common-shared-1.test.example.com',
	'common-shared-10.test.example.com',
	'adhost-zero-1.test.example.org',
	'adhost-loopback-1.test.example.org',
	'parent-dedup-1.test.example.com',
];

// Domains that MUST NOT appear (invalid entries or subdomain-deduped)
let must_not_have = [
	'localhost',
	'nodot',
	'child.parent-dedup-1.test.example.com',
	'sub.child.parent-dedup-2.test.example.com',
	'deep.sub.parent-dedup-3.test.example.com',
];

let results = [];

for (let mode in modes) {
	// Reset module state for each mode
	ti.env._loaded = false;
	ti.env.dnsmasq_features = '';
	ti.env._detected = false;
	ti.env.dnsmasq_ubus = null;
	ti.status_data.errors = [];
	ti.status_data.warnings = [];
	ti.status_data.status = '';
	ti.status_data.message = '';
	ti.status_data.stats = '';

	// Load config from mock UCI
	adb.env.load_config();

	// Override DNS mode via set_cfg (load() reassigns cfg, so direct ref is stale)
	ti.set_cfg('dns', mode);
	ti.set_cfg('enabled', true);
	ti.set_cfg('dnsmasq_sanity_check', false);
	ti.set_cfg('dnsmasq_validity_check', false);
	ti.set_cfg('heartbeat_domain', null);
	ti.set_cfg('config_update_enabled', false);
	ti.set_cfg('update_config_sizes', false);
	ti.env.dns_set_output_values(mode);

	// Collect file_url sections
	ti.append_urls();

	// Ensure output directory exists
	let out_file = ti.dns_output.file;
	let out_dir = dirname(out_file);
	mkdir(out_dir);

	// Run the download and processing pipeline
	let ok = ti.download_lists();

	if (!ok) {
		push(results, sprintf('%s: FAIL (download_lists returned false)', mode));
		if (length(ti.status_data.errors))
			push(results, sprintf('  errors: %J', ti.status_data.errors));
		continue;
	}

	// Read output
	let content = readfile(out_file);
	if (!content || !length(content)) {
		push(results, sprintf('%s: FAIL (empty output file %s)', mode, out_file));
		continue;
	}

	let lines = filter(split(content, '\n'), l => length(l) > 0);
	let line_count = length(lines);

	// Extract domains using the mode's parse_filter
	let dm = ti.dns_modes[mode];
	let domains = {};
	let bad_format = 0;

	for (let line in lines) {
		let domain;
		switch (mode) {
		case 'dnsmasq.servers':
			let m1 = match(line, /^server=\/([^\/]+)\/$/);
			domain = m1 ? m1[1] : null;
			break;
		case 'dnsmasq.conf':
			let m2 = match(line, /^local=\/([^\/]+)\/$/);
			domain = m2 ? m2[1] : null;
			break;
		case 'dnsmasq.ipset':
			let m3 = match(line, /^ipset=\/([^\/]+)\/adb$/);
			domain = m3 ? m3[1] : null;
			break;
		case 'dnsmasq.nftset':
			let m4 = match(line, /^nftset=\/([^\/]+)\/4#/);
			domain = m4 ? m4[1] : null;
			break;
		case 'dnsmasq.addnhosts':
			let m5 = match(line, /^127\.0\.0\.1 (.+)$/);
			domain = m5 ? m5[1] : null;
			break;
		case 'smartdns.domainset':
		case 'smartdns.ipset':
		case 'smartdns.nftset':
			domain = match(line, /^[a-zA-Z0-9._-]+$/) ? line : null;
			break;
		case 'unbound.adb_list':
			let m6 = match(line, /^local-zone: "([^"]+)\." always_nxdomain$/);
			domain = m6 ? m6[1] : null;
			if (!domain && line == 'server:') domain = '__header__';
			break;
		}
		if (domain && domain != '__header__')
			domains[domain] = true;
		else if (!domain)
			bad_format++;
	}

	let domain_count = length(keys(domains));

	// Check must_have domains
	let missing = [];
	for (let d in must_have) {
		if (!domains[d])
			push(missing, d);
	}

	// Check must_not_have domains
	let unwanted = [];
	for (let d in must_not_have) {
		if (domains[d])
			push(unwanted, d);
	}

	// dnsmasq.addnhosts doesn't do subdomain dedup (not in needs_optimization list)
	let skip_dedup = (mode == 'dnsmasq.addnhosts');
	if (skip_dedup) {
		unwanted = filter(unwanted, d =>
			d != 'child.parent-dedup-1.test.example.com' &&
			d != 'sub.child.parent-dedup-2.test.example.com' &&
			d != 'deep.sub.parent-dedup-3.test.example.com');
	}

	if (length(missing) == 0 && length(unwanted) == 0 && bad_format == 0 && domain_count > 100)
		push(results, sprintf('%s: PASS (%d domains)', mode, domain_count));
	else {
		let detail = sprintf('%s: FAIL (%d domains, %d bad_format', mode, domain_count, bad_format);
		if (length(missing))
			detail += sprintf(', missing: %J', missing);
		if (length(unwanted))
			detail += sprintf(', unwanted: %J', unwanted);
		detail += ')';
		push(results, detail);
	}
}

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

-- Expect stdout --
dnsmasq.servers: PASS (162 domains)
dnsmasq.conf: PASS (162 domains)
dnsmasq.ipset: PASS (162 domains)
dnsmasq.nftset: PASS (162 domains)
dnsmasq.addnhosts: PASS (165 domains)
smartdns.domainset: PASS (162 domains)
smartdns.ipset: PASS (162 domains)
smartdns.nftset: PASS (162 domains)
unbound.adb_list: PASS (162 domains)
-- End --