[board] Some test helpers that produce Squares from algebraic notiation and assert their validity

board/src/lib.rs

@@ -1,9 +1,14 @@
+// Eryn Wells <eryn@erynwells.me>
+
 mod bitboard;
 mod moves;
 pub mod piece;
 mod position;
 mod square;
 
+#[cfg(test)]
+mod tests;
+
 pub use moves::Move;
 pub use position::Position;
 pub use square::Square;

board/src/tests.rs

@@ -0,0 +1,20 @@
+// Eryn Wells <eryn@erynwells.me>
+
+/// Test helper utilities.
+use crate::Square;
+
+/// A constructor function that returns a Square representing the square on the
+/// chessboard indicated by the algebraic notation.
+macro_rules! sq_constructor {
+    ($func_name:ident) => {
+        pub(crate) fn $func_name() -> Square {
+            Square::from_algebraic_str(stringify!($func_name)).expect(stringify!($func_name))
+        }
+    };
+}
+
+impl Square {
+    sq_constructor!(e2);
+    sq_constructor!(e3);
+    sq_constructor!(e4);
+}