Npgsql.Tests.ConnectionTests.ConnectTimeout C# (CSharp) Method

        public void ConnectTimeout()
        {
            var unknownIp = Environment.GetEnvironmentVariable("NPGSQL_UNKNOWN_IP");
            if (unknownIp == null)
                TestUtil.IgnoreExceptOnBuildServer("NPGSQL_UNKNOWN_IP isn't defined and is required for connection timeout tests");

            var csb = new NpgsqlConnectionStringBuilder(ConnectionString) {
                Host = unknownIp,
                Pooling = false,
                Timeout = 2
            };
            using (var conn = new NpgsqlConnection(csb))
            {
                var sw = Stopwatch.StartNew();
                Assert.That(() => conn.Open(), Throws.Exception.TypeOf<TimeoutException>());
                Assert.That(sw.Elapsed.TotalMilliseconds, Is.GreaterThanOrEqualTo((csb.Timeout * 1000) - 100),
                    $"Timeout was supposed to happen after {csb.Timeout} seconds, but fired after {sw.Elapsed.TotalSeconds}");
                Assert.That(conn.State, Is.EqualTo(ConnectionState.Closed));
            }
        }