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

        public void BreakConnectorInPool(bool keepAlive)
        {
            var csb = new NpgsqlConnectionStringBuilder(ConnectionString) { MaxPoolSize = 1 };
            if (keepAlive)
                csb.KeepAlive = 1;

            using (var conn = new NpgsqlConnection(csb))
            {
                conn.Open();
                var connectorId = conn.ProcessID;
                conn.Close();

                // Use another connection to kill the connector currently in the pool
                using (var conn2 = OpenConnection())
                    conn2.ExecuteNonQuery($"SELECT pg_terminate_backend({connectorId})");

                // Allow some time for the terminate to occur
                Thread.Sleep(2000);

                conn.Open();
                Assert.That(conn.FullState, Is.EqualTo(ConnectionState.Open));
                if (keepAlive)
                {
                    Assert.That(conn.ProcessID, Is.Not.EqualTo(connectorId));
                    Assert.That(conn.ExecuteScalar("SELECT 1"), Is.EqualTo(1));
                }
                else
                {
                    Assert.That(conn.ProcessID, Is.EqualTo(connectorId));
                    Assert.That(() => conn.ExecuteScalar("SELECT 1"), Throws.Exception.TypeOf<NpgsqlException>());
                }
            }
        }