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

        public void AuthenticationFailure()
        {
            var csb = new NpgsqlConnectionStringBuilder(ConnectionString) { Password = "bad", Pooling = false };
            using (var conn = new NpgsqlConnection(csb))
            {
                Assert.That(() => conn.Open(), Throws.Exception
                    .TypeOf<PostgresException>()
                    .With.Property(nameof(PostgresException.SqlState)).EqualTo("28P01")
                );
                Assert.That(conn.FullState, Is.EqualTo(ConnectionState.Closed));
            }
        }