diff --git a/src/modes/mod.rs b/src/modes/mod.rs
index a7b4785..aef7ff9 100644
--- a/src/modes/mod.rs
+++ b/src/modes/mod.rs
@@ -1,3 +1,5 @@
+use crate::card::Card;
+
 pub mod pair;
 pub mod single;
 pub mod triple;
@@ -17,6 +19,8 @@ pub trait Hand: Ord {
         !self.is_proper()
     }
 
+    fn high_card(&self) -> Card;
+
     /// Given two instances of a Hand (`self` and `other`), verify if `self`
     /// footstools `other`.
     fn footstool(&self, other: &Self) -> Footstool;
@@ -47,8 +51,7 @@ mod tests {
                 (Footstool::Full, Footstool::Full) => x == y,
                 _ => false,
             },
-            "Expected footstool on {}, {} ({:?}, {:?}) to match a recognised
-            pattern",
+            "Expected footstool on {}, {} ({:?}, {:?}) to match a recognised pattern",
             x,
             y,
             res1,