test(annot): cover 7-bit ASCII percent-encoding of link /URI

Regression test for the /URI percent-encoding fix: round-trips a non-ASCII URL and an already-escaped URL through save/reload and asserts the stored URIs are pure ASCII with existing escapes preserved.

Signed-off-by: Charan Rathore <180254320+charan-rathore@users.noreply.github.com>

crates/annot/src/tests.rs

@@ -588,6 +588,25 @@ fn links_are_added_edited_listed_and_removed() {
     assert!(links::add(&mut doc, 0, [0.0, 0.0, 1.0, 1.0], &LinkAction::Page(0), &LinkStyle::default()).is_err(), "too small");
 }
 
+#[test]
+fn link_uri_is_percent_encoded_to_7_bit_ascii() {
+    use crate::links::{self, LinkAction, LinkStyle};
+    let mut doc = fixture();
+    for url in ["https://example.com/ação", "https://example.com/a%20b"] {
+        links::add(&mut doc, 0, [10.0, 10.0, 110.0, 30.0], &LinkAction::Uri(url.into()), &LinkStyle::default()).unwrap();
+    }
+    let doc = reopen(&doc);
+    let urls: Vec<String> = links::list(&doc)
+        .into_iter()
+        .filter_map(|link| match link.action {
+            LinkAction::Uri(url) => Some(url),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(urls, ["https://example.com/a%C3%A7%C3%A3o", "https://example.com/a%20b"]);
+    assert!(urls.iter().all(|url| url.is_ascii()));
+}
+
 #[test]
 fn link_edit_rejects_non_finite_and_overflowed_rectangles_without_mutating_the_pdf() {
     use crate::links::{self, LinkAction, LinkStyle};
@@ -1307,4 +1326,4 @@ fn text_box_font_size_changes_the_da_and_grows_the_box() {
         assert!(set_font_size(&mut doc, 0, i, 12.0, &meta("")).is_err());
         assert_eq!(props(&doc, 0, i).unwrap().font_size, None);
     }
-}
+               }