diff --git a/src/core/src/coosys.rs b/src/core/src/coosys.rs
index be3e99b5..e8688458 100644
--- a/src/core/src/coosys.rs
+++ b/src/core/src/coosys.rs
@@ -35,7 +35,7 @@ mod tests {
 
         let lonlat: LonLatT<f64> = LonLatT::new(ArcDeg(0.0).into(), ArcDeg(0.0).into());
         let gal_lonlat =
-            super::apply_coo_system(&CooSystem::ICRS, &CooSystem::GAL, &lonlat.vector()).lonlat();
+            super::apply_coo_system(CooSystem::ICRS, CooSystem::GAL, &lonlat.vector()).lonlat();
 
         let gal_lon_deg = gal_lonlat.lon().0 * 360.0 / (2.0 * std::f64::consts::PI);
         let gal_lat_deg = gal_lonlat.lat().0 * 360.0 / (2.0 * std::f64::consts::PI);
@@ -53,7 +53,7 @@ mod tests {
 
         let lonlat: LonLatT<f64> = LonLatT::new(ArcDeg(0.0).into(), ArcDeg(0.0).into());
         let j2000_lonlat =
-            super::apply_coo_system(&CooSystem::GAL, &CooSystem::ICRS, &lonlat.vector()).lonlat();
+            super::apply_coo_system(CooSystem::GAL, CooSystem::ICRS, &lonlat.vector()).lonlat();
         let j2000_lon_deg = j2000_lonlat.lon().0 * 360.0 / (2.0 * std::f64::consts::PI);
         let j2000_lat_deg = j2000_lonlat.lat().0 * 360.0 / (2.0 * std::f64::consts::PI);
 
@@ -71,9 +71,9 @@ mod tests {
         let gal_lonlat: LonLatT<f64> = LonLatT::new(ArcDeg(0.0).into(), ArcDeg(0.0).into());
 
         let icrs_pos =
-            super::apply_coo_system(&CooSystem::GAL, &CooSystem::ICRS, &gal_lonlat.vector());
+            super::apply_coo_system(CooSystem::GAL, CooSystem::ICRS, &gal_lonlat.vector());
 
-        let gal_lonlat = super::apply_coo_system(&CooSystem::ICRS, &CooSystem::GAL, &icrs_pos);
+        let gal_lonlat = super::apply_coo_system(CooSystem::ICRS, CooSystem::GAL, &icrs_pos);
 
         let gal_lon_deg = gal_lonlat.lon().0 * 360.0 / (2.0 * std::f64::consts::PI);
         let gal_lat_deg = gal_lonlat.lat().0 * 360.0 / (2.0 * std::f64::consts::PI);
diff --git a/src/core/src/healpix/cell.rs b/src/core/src/healpix/cell.rs
index dccdbf4b..ac885f4e 100644
--- a/src/core/src/healpix/cell.rs
+++ b/src/core/src/healpix/cell.rs
@@ -462,7 +462,6 @@ impl Ord for HEALPixCell {
     }
 }
 
-#[test]
 mod tests {
     use super::HEALPixCell;