public void ElementComposition()
{
var sb = new StringBuilder();
var elements = new DialogElement();
elements.Add(new DialogButton("Foobar1"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar1' keyword='@foobar1' />", sb.ToString());
sb.Clear();
elements.Add(new DialogButton("Foobar2"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar1' keyword='@foobar1' /><button title='Foobar2' keyword='@foobar2' />", sb.ToString());
sb.Clear();
elements.Insert(1, new DialogButton("Foobar3"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar1' keyword='@foobar1' /><button title='Foobar3' keyword='@foobar3' /><button title='Foobar2' keyword='@foobar2' />", sb.ToString());
sb.Clear();
elements.Replace(0, new DialogButton("Foobar4"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar4' keyword='@foobar4' /><button title='Foobar3' keyword='@foobar3' /><button title='Foobar2' keyword='@foobar2' />", sb.ToString());
sb.Clear();
elements.Insert(0, new DialogButton("Foobar5"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar5' keyword='@foobar5' /><button title='Foobar4' keyword='@foobar4' /><button title='Foobar3' keyword='@foobar3' /><button title='Foobar2' keyword='@foobar2' />", sb.ToString());
sb.Clear();
elements.Insert(99, new DialogButton("Foobar6"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar5' keyword='@foobar5' /><button title='Foobar4' keyword='@foobar4' /><button title='Foobar3' keyword='@foobar3' /><button title='Foobar2' keyword='@foobar2' /><button title='Foobar6' keyword='@foobar6' />", sb.ToString());
sb.Clear();
elements = new DialogElement();
elements.Insert(1, new DialogButton("Foobar7"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar7' keyword='@foobar7' />", sb.ToString());
sb.Clear();
elements = new DialogElement();
elements.Replace(0, new DialogButton("Foobar8"));
elements.Render(ref sb);
Assert.Equal("<button title='Foobar8' keyword='@foobar8' />", sb.ToString());
sb.Clear();
elements = new DialogElement("foobar, <username/>!", new DialogButton("Foobar9"), new DialogButton("Foobar10"));
elements.Render(ref sb);
Assert.Equal("foobar, <username/>!<button title='Foobar9' keyword='@foobar9' /><button title='Foobar10' keyword='@foobar10' />", sb.ToString());
sb.Clear();
elements.Replace(0, "barfoo?");
elements.Insert(1, new DialogButton("Foobar11"));
elements.Render(ref sb);
Assert.Equal("barfoo?<button title='Foobar11' keyword='@foobar11' /><button title='Foobar9' keyword='@foobar9' /><button title='Foobar10' keyword='@foobar10' />", sb.ToString());
sb.Clear();
}