From 8d75a40475c39f4108fbbce259f6eae7a2649630 Mon Sep 17 00:00:00 2001
From: Robert Garrett <robertgarrett404@gmail.com>
Date: Sat, 23 Aug 2025 13:27:39 -0500
Subject: [PATCH] Add unit tests for transposition

---
 src/card.rs | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 85 insertions(+), 2 deletions(-)

diff --git a/src/card.rs b/src/card.rs
index 73b82fc..84704bf 100644
--- a/src/card.rs
+++ b/src/card.rs
@@ -619,14 +619,97 @@ mod test {
     assert_eq!(result, expected);
   }
 
+  /// Test transposition on column 1
   #[test]
   fn transpose_vertical() {
-    todo!();
+    let left_shape = Card {
+      cells: OCTAGON,
+      ..Default::default()
+    };
+
+    // It's a small NW triangle.
+    let right_shape = Card {
+      #[rustfmt::skip]
+      cells: [
+        Cell::Filled, Cell::Empty, Cell::Empty,
+        Cell::SE, Cell::Empty, Cell::NW,
+        Cell::Empty, Cell::NW, Cell::Filled,
+      ],
+      ..Default::default()
+    };
+
+    let expected_left = Card {
+      #[rustfmt::skip]
+      cells: [
+        Cell::Filled, Cell::Filled, Cell::NE,
+        Cell::SE, Cell::Filled, Cell::Filled,
+        Cell::Empty, Cell::Filled, Cell::SE,
+      ],
+      ..Default::default()
+    };
+
+    let expected_right = Card {
+      #[rustfmt::skip]
+      cells: [
+        Cell::NW, Cell::Empty, Cell::Empty,
+        Cell::Filled, Cell::Empty, Cell::NW,
+        Cell::SW, Cell::NW, Cell::Filled,
+      ],
+      ..Default::default()
+    };
+
+    let (res_left, res_right) = left_shape.transpose(
+      right_shape,
+      TransposeSelection::Column(TransposeIndex::First),
+    );
+    assert_eq!(res_left, expected_left);
+    assert_eq!(res_right, expected_right);
   }
 
+  /// Test transposition on row 3
   #[test]
   fn transpose_horizontal() {
-    todo!();
+    let left_shape = Card {
+      cells: OCTAGON,
+      ..Default::default()
+    };
+
+    let right_shape = Card {
+      #[rustfmt::skip]
+      cells: [
+        Cell::Filled, Cell::Empty, Cell::Empty,
+        Cell::SE, Cell::Empty, Cell::NW,
+        Cell::Empty, Cell::NW, Cell::Filled,
+      ],
+      ..Default::default()
+    };
+
+    let expected_left = Card {
+      #[rustfmt::skip]
+      cells: [
+        Cell::NW, Cell::Filled, Cell::NE,
+        Cell::Filled, Cell::Filled, Cell::Filled,
+        Cell::Empty, Cell::NW, Cell::Filled,
+      ],
+      ..Default::default()
+    };
+
+    let expected_right = Card {
+      #[rustfmt::skip]
+      cells: [
+        Cell::Filled, Cell::Empty, Cell::Empty,
+        Cell::SE, Cell::Empty, Cell::NW,
+        Cell::SW, Cell::Filled, Cell::SE,
+      ],
+      ..Default::default()
+    };
+
+    let (res_left, res_right) = left_shape.transpose(
+      right_shape,
+      TransposeSelection::Row(TransposeIndex::Third),
+    );
+    assert_eq!(res_left, expected_left);
+    assert_eq!(res_right, expected_right);
   }
 
   #[test]