internal void Render_Section()
{
// Arrange
var renderer = new PageRenderer();
renderer.AppendSection(
"header",
$"section content line 1{Environment.NewLine}section content line 2"
);
// Act
var contentText = renderer.ToString();
// Assert
var lines = contentText.ToLines();
Assert.Equal(3, lines.Length);
Assert.Equal("header", lines[0]);
Assert.Equal("section content line 1", lines[1]);
Assert.Equal("section content line 2", lines[2]);
}