Npgsql.Tests.ReaderNewSchemaTests.IsUnique C# (CSharp) Method

        public void IsUnique()
        {
            using (var conn = OpenConnection())
            {
                conn.ExecuteNonQuery("CREATE TEMP TABLE data (id INT PRIMARY KEY, non_id INT, uniq INT UNIQUE)");

                using (var cmd = new NpgsqlCommand("SELECT id,non_id,uniq,8 FROM data", conn))
                using (var reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly | CommandBehavior.KeyInfo))
                {
                    var columns = reader.GetColumnSchema();
                    Assert.That(columns[0].IsUnique, Is.True);
                    Assert.That(columns[1].IsUnique, Is.False);
                    Assert.That(columns[2].IsUnique, Is.True);
                    Assert.That(columns[3].IsUnique, Is.Null);
                }
            }
        }