Add unit tests

server-rs/src/routes/hexagons.rs

@@ -282,7 +282,9 @@ pub async fn get_hexagons(
         let t_total = t0.elapsed();
         info!(
             resolution,
-            cells = groups.len(),
+            cells_before_filter = groups.len(),
+            cells_after_filter = features.len(),
+            bounds = format_args!("{:.4},{:.4},{:.4},{:.4}", south, west, north, east),
             filters = num_filters,
             filters_raw = filters_str.as_deref().unwrap_or("-"),
             agg_ms = format_args!("{:.1}", t_agg.as_secs_f64() * 1000.0),