public void Bold()
        {
            string testString = "Ali";

            builder.Bold().AddText(testString);

            Paragraph paragraph   = builder.GetParagraph();
            Text      textContent = (Text)paragraph.GetChildren()[0];

            PdfType1Font font = textContent.GetProperty <PdfType1Font>(20);

            Assert.Equal("Helvetica-Bold", font.GetFontProgram().GetFontNames().ToString());
        }