diff --git a/core/dr-pano/src/fill.rs b/core/dr-pano/src/fill.rs
index 7685fac..b7118d5 100644
--- a/core/dr-pano/src/fill.rs
+++ b/core/dr-pano/src/fill.rs
@@ -745,8 +745,16 @@ mod tests {
             tile: 64,
             seen: Vec::new(),
         };
-        let tiles = fill_border(&mut rgb, 300, 40, &known, &mut model, test_params(0), &mut |_, _| {})
-            .unwrap();
+        let tiles = fill_border(
+            &mut rgb,
+            300,
+            40,
+            &known,
+            &mut model,
+            test_params(0),
+            &mut |_, _| {},
+        )
+        .unwrap();
         assert!(tiles > 0, "no tile fitted a picture shorter than the tile");
         for i in 0..300 * 40 {
             if !known[i] {