docs: catch up handoff and changelog

solitaire_data/src/matomo_client.rs

@@ -114,3 +114,62 @@ fn url_encode(s: &str) -> String {
         })
         .collect()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn pending(client: &MatomoClient) -> Vec<String> {
+        client.pending.lock().expect("pending lock").clone()
+    }
+
+    #[test]
+    fn event_buffers_encoded_matomo_query() {
+        let client = MatomoClient::new(
+            "https://analytics.example.com/",
+            7,
+            Some("alice bob".into()),
+        );
+
+        client.event("Game Flow", "Won+Fast", Some("draw three"), Some(42.5));
+
+        let pending = pending(&client);
+        assert_eq!(pending.len(), 1);
+        let query = &pending[0];
+        assert!(query.contains("idsite=7"));
+        assert!(query.contains("rec=1"));
+        assert!(query.contains("e_c=Game%20Flow"));
+        assert!(query.contains("e_a=Won%2BFast"));
+        assert!(query.contains("e_n=draw%20three"));
+        assert!(query.contains("e_v=42.5"));
+        assert!(query.contains("uid=alice%20bob"));
+    }
+
+    #[test]
+    fn event_buffer_drops_oldest_entries_when_capacity_exceeded() {
+        let client = MatomoClient::new("https://analytics.example.com", 1, None);
+
+        for idx in 0..101 {
+            client.event("Game", "Start", Some(&format!("event-{idx}")), None);
+        }
+
+        let pending = pending(&client);
+        assert_eq!(pending.len(), 51);
+        assert!(
+            pending[0].contains("event-50"),
+            "oldest retained event should be event-50, got {}",
+            pending[0]
+        );
+        assert!(
+            pending[50].contains("event-100"),
+            "newest retained event should be event-100, got {}",
+            pending[50]
+        );
+    }
+
+    #[test]
+    fn url_encode_leaves_unreserved_bytes_and_escapes_everything_else() {
+        assert_eq!(url_encode("AZaz09-_.~"), "AZaz09-_.~");
+        assert_eq!(url_encode("a b+c/d?"), "a%20b%2Bc%2Fd%3F");
+    }
+}