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());
}