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

        public void ConnectionRefused(bool pooled)
        {
            var csb = new NpgsqlConnectionStringBuilder(ConnectionString) { Port = 44444, Pooling = pooled };
            using (var conn = new NpgsqlConnection(csb)) {
                Assert.That(() => conn.Open(), Throws.Exception
                    .TypeOf<SocketException>()
#if !NETCOREAPP1_0
// CoreCLR currently has an issue which causes the wrong SocketErrorCode to be set on Linux:
// https://github.com/dotnet/corefx/issues/8464

                    .With.Property(nameof(SocketException.SocketErrorCode)).EqualTo(SocketError.ConnectionRefused)
#endif
                );
                Assert.That(conn.FullState, Is.EqualTo(ConnectionState.Closed));
            }
        }