diff --git a/rust/fiscal-xbrl-core/src/surface_mapper.rs b/rust/fiscal-xbrl-core/src/surface_mapper.rs
index 5e825ab..bf31af7 100644
--- a/rust/fiscal-xbrl-core/src/surface_mapper.rs
+++ b/rust/fiscal-xbrl-core/src/surface_mapper.rs
@@ -1358,10 +1358,7 @@ mod tests {
         assert_eq!(dac.values.get("p1").copied().flatten(), Some(2106.0));
         assert_eq!(
             dac.source_concepts,
-            vec![
-                "us-gaap:DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired"
-                    .to_string()
-            ]
+            vec!["us-gaap:DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired".to_string()]
         );
         assert_eq!(dac.source_row_keys, vec!["dac-voba".to_string()]);
 
@@ -1379,19 +1376,19 @@ mod tests {
     fn derives_cash_flow_rows_applies_signs_and_hides_helper_surfaces() {
         let mut rows = empty_map();
         rows.get_mut("cash_flow").unwrap().extend([
-            row("cfo", "us-gaap:NetCashProvidedByUsedInOperatingActivities", "cash_flow", 120.0),
+            row(
+                "cfo",
+                "us-gaap:NetCashProvidedByUsedInOperatingActivities",
+                "cash_flow",
+                120.0,
+            ),
             row(
                 "capex",
                 "us-gaap:PaymentsToAcquirePropertyPlantAndEquipment",
                 "cash_flow",
                 35.0,
             ),
-            row(
-                "debt-repaid",
-                "us-gaap:RepaymentsOfDebt",
-                "cash_flow",
-                14.0,
-            ),
+            row("debt-repaid", "us-gaap:RepaymentsOfDebt", "cash_flow", 14.0),
             row(
                 "share-repurchase",
                 "us-gaap:PaymentsForRepurchaseOfCommonStock",
@@ -1462,9 +1459,18 @@ mod tests {
         assert_eq!(capex.values.get("p1").copied().flatten(), Some(-35.0));
         assert_eq!(debt_repaid.values.get("p1").copied().flatten(), Some(-14.0));
         assert_eq!(repurchases.values.get("p1").copied().flatten(), Some(-11.0));
-        assert_eq!(changes_unearned.values.get("p1").copied().flatten(), Some(25.0));
-        assert_eq!(changes_other.values.get("p1").copied().flatten(), Some(-10.0));
-        assert_eq!(free_cash_flow.values.get("p1").copied().flatten(), Some(85.0));
+        assert_eq!(
+            changes_unearned.values.get("p1").copied().flatten(),
+            Some(25.0)
+        );
+        assert_eq!(
+            changes_other.values.get("p1").copied().flatten(),
+            Some(-10.0)
+        );
+        assert_eq!(
+            free_cash_flow.values.get("p1").copied().flatten(),
+            Some(85.0)
+        );
 
         assert!(cash_flow_rows.iter().all(|row| {
             row.key != "contract_liability_incurred"
@@ -1570,7 +1576,10 @@ mod tests {
         assert_eq!(cfo.category, "operating");
         assert_eq!(capex.category, "investing");
         assert_eq!(capex.values.get("p1").copied().flatten(), Some(-25.0));
-        assert_eq!(free_cash_flow.values.get("p1").copied().flatten(), Some(65.0));
+        assert_eq!(
+            free_cash_flow.values.get("p1").copied().flatten(),
+            Some(65.0)
+        );
     }
 
     #[test]
@@ -1617,6 +1626,9 @@ mod tests {
             .unwrap();
 
         assert_eq!(capex.values.get("p1").copied().flatten(), Some(-320.0));
-        assert_eq!(acquisitions.values.get("p1").copied().flatten(), Some(-15.0));
+        assert_eq!(
+            acquisitions.values.get("p1").copied().flatten(),
+            Some(-15.0)
+        );
     }
 }