diff --git a/milli/src/search/facet/facet_distribution_iter.rs b/milli/src/search/facet/facet_distribution_iter.rs
index f347b9d7e..16b83c2db 100644
--- a/milli/src/search/facet/facet_distribution_iter.rs
+++ b/milli/src/search/facet/facet_distribution_iter.rs
@@ -109,7 +109,7 @@ where
 #[cfg(test)]
 mod tests {
     use heed::BytesDecode;
-    use rand::{rngs::SmallRng, Rng, SeedableRng};
+    use rand::{Rng, SeedableRng};
     use roaring::RoaringBitmap;
     use std::ops::ControlFlow;
 
@@ -125,7 +125,7 @@ mod tests {
         for i in 0..256u16 {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(i as u32);
-            index.insert(&mut txn, 0, &i, &bitmap);
+            index.insert(&mut txn, 0, &(i as f64), &bitmap);
         }
         txn.commit().unwrap();
         index
@@ -134,14 +134,14 @@ mod tests {
         let index = FacetIndex::<OrderedF64Codec>::new(4, 8);
         let mut txn = index.env.write_txn().unwrap();
 
-        let rng = rand::rngs::SmallRng::from_seed([0; 32]);
+        let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
         let keys =
             std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
 
         for (_i, key) in keys.into_iter().enumerate() {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(key);
-            bitmap.insert(key + 100.);
+            bitmap.insert(key + 100);
             index.insert(&mut txn, 0, &(key as f64), &bitmap);
         }
         txn.commit().unwrap();
@@ -156,13 +156,13 @@ mod tests {
     #[test]
     fn filter_distribution_all() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
             let candidates = (0..=255).into_iter().collect::<RoaringBitmap>();
             let mut results = String::new();
             iterate_over_facet_distribution(
                 &txn,
-                &index.db.content,
+                index.db.content,
                 0,
                 &candidates,
                 |facet, count| {
@@ -170,7 +170,8 @@ mod tests {
                     results.push_str(&format!("{facet}: {count}\n"));
                     ControlFlow::Continue(())
                 },
-            );
+            )
+            .unwrap();
             insta::assert_snapshot!(format!("filter_distribution_{i}_all"), results);
 
             txn.commit().unwrap();
@@ -179,14 +180,14 @@ mod tests {
     #[test]
     fn filter_distribution_all_stop_early() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
             let candidates = (0..=255).into_iter().collect::<RoaringBitmap>();
             let mut results = String::new();
             let mut nbr_facets = 0;
             iterate_over_facet_distribution(
                 &txn,
-                &index.db.content,
+                index.db.content,
                 0,
                 &candidates,
                 |facet, count| {
@@ -200,7 +201,8 @@ mod tests {
                         ControlFlow::Continue(())
                     }
                 },
-            );
+            )
+            .unwrap();
             insta::assert_snapshot!(format!("filter_distribution_{i}_all_stop_early"), results);
 
             txn.commit().unwrap();
diff --git a/milli/src/search/facet/facet_range_search.rs b/milli/src/search/facet/facet_range_search.rs
index b05a3c275..7e7c5e713 100644
--- a/milli/src/search/facet/facet_range_search.rs
+++ b/milli/src/search/facet/facet_range_search.rs
@@ -259,8 +259,9 @@ impl<'t, 'b, 'bitmap> FacetRangeSearch<'t, 'b, 'bitmap> {
 #[cfg(test)]
 mod tests {
     use crate::{
-        heed_codec::facet::new::ordered_f64_codec::OrderedF64Codec,
-        search::facet::test::FacetIndex, snapshot_tests::display_bitmap,
+        heed_codec::facet::new::{ordered_f64_codec::OrderedF64Codec, FacetKeyCodec},
+        search::facet::test::FacetIndex,
+        snapshot_tests::display_bitmap,
     };
     use rand::{Rng, SeedableRng};
     use roaring::RoaringBitmap;
@@ -283,7 +284,7 @@ mod tests {
         let index = FacetIndex::<OrderedF64Codec>::new(4, 8);
         let mut txn = index.env.write_txn().unwrap();
 
-        let rng = rand::rngs::SmallRng::from_seed([0; 32]);
+        let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
         let keys =
             std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
 
@@ -305,7 +306,7 @@ mod tests {
     #[test]
     fn filter_range_increasing() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
             let mut results = String::new();
             for i in 0..=255 {
@@ -314,7 +315,7 @@ mod tests {
                 let end = Bound::Included(i);
                 let docids = find_docids_of_facet_within_bounds::<OrderedF64Codec>(
                     &txn,
-                    &index.db.content,
+                    index.db.content.remap_key_type::<FacetKeyCodec<OrderedF64Codec>>(),
                     0,
                     &start,
                     &end,
@@ -333,7 +334,7 @@ mod tests {
                 let end = Bound::Excluded(i);
                 let docids = find_docids_of_facet_within_bounds::<OrderedF64Codec>(
                     &txn,
-                    &index.db.content,
+                    index.db.content.remap_key_type::<FacetKeyCodec<OrderedF64Codec>>(),
                     0,
                     &start,
                     &end,
@@ -351,7 +352,7 @@ mod tests {
     #[test]
     fn filter_range_decreasing() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
 
             let mut results = String::new();
@@ -362,7 +363,7 @@ mod tests {
                 let end = Bound::Included(255.);
                 let docids = find_docids_of_facet_within_bounds::<OrderedF64Codec>(
                     &txn,
-                    &index.db.content,
+                    index.db.content.remap_key_type::<FacetKeyCodec<OrderedF64Codec>>(),
                     0,
                     &start,
                     &end,
@@ -384,7 +385,7 @@ mod tests {
                 let end = Bound::Excluded(255.);
                 let docids = find_docids_of_facet_within_bounds::<OrderedF64Codec>(
                     &txn,
-                    &index.db.content,
+                    index.db.content.remap_key_type::<FacetKeyCodec<OrderedF64Codec>>(),
                     0,
                     &start,
                     &end,
@@ -404,7 +405,7 @@ mod tests {
     #[test]
     fn filter_range_pinch() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
 
             let mut results = String::new();
@@ -415,7 +416,7 @@ mod tests {
                 let end = Bound::Included(255. - i);
                 let docids = find_docids_of_facet_within_bounds::<OrderedF64Codec>(
                     &txn,
-                    &index.db.content,
+                    index.db.content.remap_key_type::<FacetKeyCodec<OrderedF64Codec>>(),
                     0,
                     &start,
                     &end,
@@ -434,7 +435,7 @@ mod tests {
                 let end = Bound::Excluded(255. - i);
                 let docids = find_docids_of_facet_within_bounds::<OrderedF64Codec>(
                     &txn,
-                    &index.db.content,
+                    index.db.content.remap_key_type::<FacetKeyCodec<OrderedF64Codec>>(),
                     0,
                     &start,
                     &end,
diff --git a/milli/src/search/facet/facet_sort_ascending.rs b/milli/src/search/facet/facet_sort_ascending.rs
index e4b77c691..8af191089 100644
--- a/milli/src/search/facet/facet_sort_ascending.rs
+++ b/milli/src/search/facet/facet_sort_ascending.rs
@@ -83,7 +83,6 @@ impl<'t, 'e> Iterator for AscendingFacetSort<'t, 'e> {
 
 #[cfg(test)]
 mod tests {
-    use heed::BytesDecode;
     use rand::Rng;
     use rand::SeedableRng;
     use roaring::RoaringBitmap;
@@ -100,7 +99,7 @@ mod tests {
         for i in 0..256u16 {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(i as u32);
-            index.insert(&mut txn, 0, &i, &bitmap);
+            index.insert(&mut txn, 0, &(i as f64), &bitmap);
         }
         txn.commit().unwrap();
         index
@@ -109,7 +108,7 @@ mod tests {
         let index = FacetIndex::<OrderedF64Codec>::new(4, 8);
         let mut txn = index.env.write_txn().unwrap();
 
-        let rng = rand::rngs::SmallRng::from_seed([0; 32]);
+        let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
         let keys =
             std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
 
@@ -131,14 +130,14 @@ mod tests {
     #[test]
     fn filter_sort() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
             let candidates = (200..=300).into_iter().collect::<RoaringBitmap>();
             let mut results = String::new();
-            let iter = ascending_facet_sort(&txn, &index.db.content, 0, candidates);
-            for (facet, docids) in iter {
-                let facet = OrderedF64Codec::bytes_decode(facet).unwrap();
-                results.push_str(&format!("{facet}: {}\n", display_bitmap(&docids)));
+            let iter = ascending_facet_sort(&txn, index.db.content, 0, candidates).unwrap();
+            for el in iter {
+                let docids = el.unwrap();
+                results.push_str(&display_bitmap(&docids));
             }
             insta::assert_snapshot!(format!("filter_sort_{i}_ascending"), results);
 
diff --git a/milli/src/search/facet/facet_sort_descending.rs b/milli/src/search/facet/facet_sort_descending.rs
index fc62b894f..5ce55ec6d 100644
--- a/milli/src/search/facet/facet_sort_descending.rs
+++ b/milli/src/search/facet/facet_sort_descending.rs
@@ -111,8 +111,6 @@ impl<'t> Iterator for DescendingFacetSort<'t> {
 
 #[cfg(test)]
 mod tests {
-
-    use heed::BytesDecode;
     use rand::Rng;
     use rand::SeedableRng;
     use roaring::RoaringBitmap;
@@ -129,7 +127,7 @@ mod tests {
         for i in 0..256u16 {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(i as u32);
-            index.insert(&mut txn, 0, &i, &bitmap);
+            index.insert(&mut txn, 0, &(i as f64), &bitmap);
         }
         txn.commit().unwrap();
         index
@@ -138,14 +136,14 @@ mod tests {
         let index = FacetIndex::<OrderedF64Codec>::new(4, 8);
         let mut txn = index.env.write_txn().unwrap();
 
-        let rng = rand::rngs::SmallRng::from_seed([0; 32]);
+        let mut rng = rand::rngs::SmallRng::from_seed([0; 32]);
         let keys =
             std::iter::from_fn(|| Some(rng.gen_range(0..256))).take(128).collect::<Vec<u32>>();
 
         for (_i, key) in keys.into_iter().enumerate() {
             let mut bitmap = RoaringBitmap::new();
             bitmap.insert(key);
-            bitmap.insert(key + 100.);
+            bitmap.insert(key + 100);
             index.insert(&mut txn, 0, &(key as f64), &bitmap);
         }
         txn.commit().unwrap();
@@ -160,15 +158,15 @@ mod tests {
     #[test]
     fn filter_sort_descending() {
         let indexes = [get_simple_index(), get_random_looking_index()];
-        for (i, index) in indexes.into_iter().enumerate() {
+        for (i, index) in indexes.iter().enumerate() {
             let txn = index.env.read_txn().unwrap();
             let candidates = (200..=300).into_iter().collect::<RoaringBitmap>();
             let mut results = String::new();
             let db = index.db.content.remap_key_type::<FacetKeyCodec<MyByteSlice>>();
-            let iter = descending_facet_sort(&txn, &db, 0, candidates);
-            for (facet, docids) in iter {
-                let facet = OrderedF64Codec::bytes_decode(facet).unwrap();
-                results.push_str(&format!("{facet}: {}\n", display_bitmap(&docids)));
+            let iter = descending_facet_sort(&txn, db, 0, candidates).unwrap();
+            for el in iter {
+                let docids = el.unwrap();
+                results.push_str(&display_bitmap(&docids));
             }
             insta::assert_snapshot!(format!("filter_sort_{i}_descending"), results);
 
diff --git a/milli/src/search/facet/mod.rs b/milli/src/search/facet/mod.rs
index 12074cc12..2ca6c0689 100644
--- a/milli/src/search/facet/mod.rs
+++ b/milli/src/search/facet/mod.rs
@@ -78,9 +78,10 @@ pub(crate) fn get_highest_level<'t>(
 
 #[cfg(test)]
 mod test {
+    use crate::update::FacetsUpdateIncremental;
+    use heed::{BytesDecode, BytesEncode, Env, RwTxn};
+    use roaring::RoaringBitmap;
     use std::{fmt::Display, marker::PhantomData, rc::Rc};
-
-    use heed::{BytesDecode, BytesEncode, Env};
     use tempfile::TempDir;
 
     use crate::{
@@ -148,6 +149,17 @@ mod test {
                 _phantom: PhantomData,
             }
         }
+        pub fn insert<'a>(
+            &self,
+            rwtxn: &'a mut RwTxn,
+            field_id: u16,
+            key: &'a <BoundCodec as BytesEncode<'a>>::EItem,
+            docids: &RoaringBitmap,
+        ) {
+            let update = FacetsUpdateIncremental::new(self.db.content);
+            let key_bytes = BoundCodec::bytes_encode(&key).unwrap();
+            update.insert(rwtxn, field_id, &key_bytes, docids).unwrap();
+        }
     }
 
     impl<BoundCodec> Display for FacetIndex<BoundCodec>
diff --git a/milli/src/snapshot_tests.rs b/milli/src/snapshot_tests.rs
index 17ee3f392..c6b83eeb6 100644
--- a/milli/src/snapshot_tests.rs
+++ b/milli/src/snapshot_tests.rs
@@ -1,15 +1,10 @@
+use crate::heed_codec::facet::new::{FacetGroupValue, FacetKey};
+use crate::{make_db_snap_from_iter, ExternalDocumentsIds, Index};
+use roaring::RoaringBitmap;
 use std::borrow::Cow;
 use std::fmt::Write;
 use std::path::Path;
 
-use heed::types::ByteSlice;
-use heed::BytesDecode;
-use roaring::RoaringBitmap;
-
-use crate::heed_codec::facet::new::{FacetGroupValue, FacetKey};
-use crate::heed_codec::facet::FacetStringZeroBoundsValueCodec;
-use crate::{make_db_snap_from_iter, CboRoaringBitmapCodec, ExternalDocumentsIds, Index};
-
 #[track_caller]
 pub fn default_db_snapshot_settings_for_test(name: Option<&str>) -> insta::Settings {
     let mut settings = insta::Settings::clone_current();
diff --git a/milli/src/update/facet/incremental.rs b/milli/src/update/facet/incremental.rs
index d2fb3755f..df0b93839 100644
--- a/milli/src/update/facet/incremental.rs
+++ b/milli/src/update/facet/incremental.rs
@@ -17,13 +17,18 @@ enum DeletionResult {
     Remove { prev: Option<Vec<u8>>, next: Option<Vec<u8>> },
 }
 
-struct FacetUpdateIncremental {
+pub struct FacetsUpdateIncremental {
     db: heed::Database<FacetKeyCodec<MyByteSlice>, FacetGroupValueCodec>,
     group_size: usize,
     min_level_size: usize,
     max_group_size: usize,
 }
-impl FacetUpdateIncremental {
+impl FacetsUpdateIncremental {
+    pub fn new(db: heed::Database<FacetKeyCodec<MyByteSlice>, FacetGroupValueCodec>) -> Self {
+        Self { db, group_size: 4, min_level_size: 5, max_group_size: 8 }
+    }
+}
+impl FacetsUpdateIncremental {
     fn find_insertion_key_value(
         &self,
         field_id: u16,
@@ -263,7 +268,7 @@ impl FacetUpdateIncremental {
         }
         let group_size = self.group_size;
 
-        let highest_level = get_highest_level(&txn, *self.db, field_id)?;
+        let highest_level = get_highest_level(&txn, self.db, field_id)?;
 
         let result =
             self.insert_in_level(txn, field_id, highest_level as u8, new_key, new_values)?;
@@ -412,7 +417,7 @@ impl FacetUpdateIncremental {
         if self.db.get(txn, &FacetKey { field_id, level: 0, left_bound: key })?.is_none() {
             return Ok(());
         }
-        let highest_level = get_highest_level(&txn, *self.db, field_id)?;
+        let highest_level = get_highest_level(&txn, self.db, field_id)?;
 
         // let key_bytes = BoundCodec::bytes_encode(&key).unwrap();
 
diff --git a/milli/src/update/mod.rs b/milli/src/update/mod.rs
index cd96d3e88..8fba16d3d 100644
--- a/milli/src/update/mod.rs
+++ b/milli/src/update/mod.rs
@@ -2,6 +2,7 @@ pub use self::available_documents_ids::AvailableDocumentsIds;
 pub use self::clear_documents::ClearDocuments;
 pub use self::delete_documents::{DeleteDocuments, DocumentDeletionResult};
 pub use self::facet::bulk::FacetsUpdateBulk;
+pub use self::facet::incremental::FacetsUpdateIncremental;
 pub use self::index_documents::{
     DocumentAdditionResult, DocumentId, IndexDocuments, IndexDocumentsConfig, IndexDocumentsMethod,
 };