public void TestGetDataTableFromSql()
        {
            const string sql = "SELECT * FROM dbo.Customer";

            var erg = _db.GetDataTable(sql);

            Assert.IsTrue(erg.Rows.Count > 0);
        }
        public void TestGetDataTableSql()
        {
            // Assert
            var sql = "SELECT * FROM \"Customer\";";

            // Act
            var result = _db.GetDataTable(sql);

            // Assert
            Assert.IsNotNull(result);
        }