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

        public void ConnectionRefusedAsync(bool pooled)
        {
            var csb = new NpgsqlConnectionStringBuilder(ConnectionString) { Port = 44444, Pooling = pooled };
            using (var conn = new NpgsqlConnection(csb))
            {
                Assert.That(async () => await conn.OpenAsync(), Throws.Exception
                    .TypeOf<SocketException>()
                    .With.Property(nameof(SocketException.SocketErrorCode)).EqualTo(SocketError.ConnectionRefused)
                );
                Assert.That(conn.FullState, Is.EqualTo(ConnectionState.Closed));
            }
        }
#endif