test_net_create_connection.cjs
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test_net_create_connection.cjs
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	const net = require('node:net');
	const assert = require('node:assert');

	let connected = false;
	let serverSawData = false;
	let clientSawData = false;
	let invalidHostError = false;
	let invalidPortError = false;
	const timeout = setTimeout(() => {
	if (!connected \|\| !serverSawData \|\| !clientSawData \|\| !invalidHostError \|\| !invalidPortError) {
	throw new Error('net.createConnection timed out');
	}
	}, 2000);

	function finishWithInvalidHostCheck() {
	const socket = net.connect({ host: '256.256.256.256', port: 80 });
	socket.on('error', (error) => {
	invalidHostError = true;
	assert(error instanceof Error);
	assert.strictEqual(typeof error.message, 'string');
	finishWithInvalidPortCheck();
	});
	}

	function finishWithInvalidPortCheck() {
	const socket = net.connect({ host: '127.0.0.1', port: 65536 });
	socket.on('error', (error) => {
	invalidPortError = true;
	assert(error instanceof Error);
	assert.strictEqual(typeof error.message, 'string');
	clearTimeout(timeout);
	console.log('net:create-connection:ok');
	});
	}

	const server = net.createServer((socket) => {
	socket.setEncoding('utf8');
	socket.on('data', (chunk) => {
	if (chunk !== 'ping') throw new Error(`server received ${chunk}`);
	serverSawData = true;
	socket.write('pong');
	});
	});

	server.on('error', (err) => {
	throw err;
	});

	server.listen(0, '127.0.0.1', () => {
	const address = server.address();
	const client = net.createConnection({ port: address.port, host: '127.0.0.1' }, () => {
	connected = true;
	assert.strictEqual(client.pending, false);
	assert.strictEqual(client.connecting, false);
	client.write('ping');
	});

	assert.strictEqual(client.pending, true);
	assert.strictEqual(client.connecting, true);

	client.setEncoding('utf8');
	client.on('error', (err) => {
	throw err;
	});
	client.on('data', (chunk) => {
	if (chunk !== 'pong') throw new Error(`client received ${chunk}`);
	clientSawData = true;
	client.end();
	server.close(() => {
	if (!connected \|\| !serverSawData \|\| !clientSawData) {
	throw new Error('net.createConnection did not complete the loopback exchange');
	}
	finishWithInvalidHostCheck();
	});
	});
	});

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