public void AddEmptyRow()
        {
            var table = new StringTableBuilder();

            table.AddColumn("col1");
            table.AddColumn("col2");
            table.AddColumn("col3");

            var row = table.AddRow();

            row.SetCell("col1", "a");
            row.SetCell("col2", "b");
            row.SetCell("col3", "c");

            table.AddEmptyRow();

            row = table.AddRow();
            row.SetCell("col1", "d");
            row.SetCell("col2", "e");
            row.SetCell("col3", "f");

            var output = table.ToString();

            Console.WriteLine(output);
            var expectedOutput =
                "abc" + s_nl +
                "   " + s_nl +
                "def";

            Assert.Equal(expectedOutput, output);
        }