[board] Add position::tests::rook_for_castle

board/src/position/position.rs

@@ -239,7 +239,7 @@ impl fmt::Display for Position {
 
 #[cfg(test)]
 mod tests {
-    use crate::position;
+    use crate::{position, Castle, Color};
 
     #[test]
     fn king_is_in_check() {
@@ -258,4 +258,22 @@ mod tests {
         ];
         assert!(!pos.is_king_in_check());
     }
+
+    #[test]
+    fn rook_for_castle() {
+        let pos = position![
+            White King on E1,
+            White Rook on H1,
+            White Rook on A1,
+        ];
+
+        assert_eq!(
+            pos.rook_for_castle(Color::White, Castle::KingSide),
+            Some(piece!(White Rook on H1))
+        );
+        assert_eq!(
+            pos.rook_for_castle(Color::White, Castle::QueenSide),
+            Some(piece!(White Rook on A1))
+        );
+    }
 }

board/src/sight.rs

@@ -230,7 +230,7 @@ mod tests {
 
     #[macro_use]
     mod knight {
-        use crate::{sight::Sight, Position};
+        use crate::sight::Sight;
 
         sight_test!(
             f6_knight,