[board] Implement a test_position macro that prints a Position after it builds it

Update the sight tests to use test_position!
Remove a stray leftover mut.
Clean up the test imports.

board/src/macros.rs

@@ -18,3 +18,17 @@ macro_rules! position {
             .build()
     };
 }
+
+#[cfg(test)]
+#[macro_export]
+macro_rules! test_position {
+    [$($color:ident $shape:ident on $square:ident),* $(,)?] => {
+        {
+            let pos = $crate::PositionBuilder::new()
+                $(.place_piece(piece!($color $shape on $square)))*
+                .build();
+            println!("{pos}");
+            pos
+        }
+    };
+}

board/src/sight.rs

@@ -174,13 +174,13 @@ mod tests {
     }
 
     mod pawn {
-        use crate::{position, sight::Sight, BitBoard, Position, Square};
+        use crate::{sight::Sight, BitBoard, Square};
 
         sight_test!(e4_pawn, piece!(White Pawn on E4), bitboard!(D5, F5));
 
         sight_test!(
             e4_pawn_one_blocker,
-            position![
+            test_position![
                 White Bishop on D5,
                 White Pawn on E4,
             ],
@@ -190,11 +190,12 @@ mod tests {
 
         #[test]
         fn e4_pawn_two_blocker() {
-            let pos = position!(
+            let pos = test_position!(
                 White Bishop on D5,
                 White Queen on F5,
                 White Pawn on E4,
             );
+
             let pp = piece!(White Pawn on E4);
             let sight = pp.sight_in_position(&pos);
 
@@ -203,11 +204,12 @@ mod tests {
 
         #[test]
         fn e4_pawn_capturable() {
-            let pos = position!(
+            let pos = test_position!(
                 Black Bishop on D5,
                 White Queen on F5,
                 White Pawn on E4,
             );
+
             let pp = piece!(White Pawn on E4);
             let sight = pp.sight_in_position(&pos);
 
@@ -216,7 +218,7 @@ mod tests {
 
         #[test]
         fn e5_en_passant() {
-            let mut pos = position!(
+            let mut pos = test_position!(
                 White Pawn on E5,
                 Black Pawn on D5,
             );