Update paper size coverage

src/io/paper_sizes.rs

@@ -1,4 +1,4 @@
-//! ISO paper sizes and sheet orientation for window plotting.
+//! Standard paper sizes and sheet orientation for window plotting.
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum PaperSize {
@@ -106,10 +106,13 @@ mod tests {
     use super::*;
 
     #[test]
-    fn iso_dimensions_and_orientation() {
+    fn paper_dimensions_and_orientation() {
         assert_eq!(PaperSize::A4.dimensions_mm(), (210.0, 297.0));
         assert_eq!(PaperSize::A0.dimensions_mm(), (841.0, 1189.0));
-        assert_eq!(PaperSize::ALL.len(), 5);
+        assert_eq!(PaperSize::Letter.dimensions_mm(), (215.9, 279.4));
+        assert_eq!(PaperSize::Legal.dimensions_mm(), (215.9, 355.6));
+        assert_eq!(PaperSize::Tabloid.dimensions_mm(), (279.4, 431.8));
+        assert_eq!(PaperSize::ALL.len(), 8);
         assert_eq!(PaperSize::A3.label(), "A3");
         // Portrait keeps (w,h); landscape swaps.
         assert_eq!(sheet_mm(PaperSize::A4, Orientation::Portrait), (210.0, 297.0));