public void MultiElementsTest() { Html html = new Html(); string headerId = "id1"; string headerName = "name1"; string headerText = "text"; string headerStyle = "color:red"; Header1 h1 = new Header1(headerText, headerId, headerName, headerStyle); html.AddElement(h1); Assert.Equal($"<html><h1 id=\"{headerId}\" name=\"{headerName}\" style=\"{headerStyle}\">{headerText}</h1></html>", html.ToHtml()); }