chore

tests/examples_test.v

@@ -0,0 +1,43 @@
+import os
+import time
+
+fn run(entrypoint string) os.Result {
+	cmd := 'v -Wfatal-errors -path "${@VMODROOT}/../|@vlib" run ${entrypoint}'
+	return os.execute(cmd)
+}
+
+fn test_example_host_fqdn() {
+	r := run('examples/host_fqdn.v')
+	dump(r.output)
+	// host_fqdn may return empty string and this is also fine. So check exit_code only.
+	assert r.exit_code == 0
+}
+
+fn test_example_tcp_echo_server() {
+	expect_server := 'Listening on 127.0.0.1:1088...
+	|Accpeted connection. Remote address: 127.0.0.1, remote port: 1001
+	|Received from client: 18 bytes, data: Hello from client!
+	|Sent to the client: 18 bytes, data: Hello from client!'.strip_margin()
+
+	expect_client := 'Connected to server 127.0.0.1:1088...
+	|Sent to the server: 18 bytes, data: Hello from client!
+	|Received from server: 18 bytes, data: Hello from client!'.strip_margin()
+
+	mut threads := []thread os.Result{}
+	threads << spawn run('examples/tcp_echo_server.v -test')
+	time.sleep(time.second * 1)
+	threads << spawn run('examples/tcp_echo_client.v')
+	results := threads.wait()
+
+	// result.output contains the string with lots of trailing zeros, so we
+	// use limit() to shrink the output string to the expected length.
+	for result in results {
+		dump(result)
+		assert result.exit_code == 0
+		if result.output.contains('Listening') {
+			assert result.output.limit(expect_server.len) == expect_server
+		} else {
+			assert result.output.limit(expect_client.len) == expect_client
+		}
+	}
+}