Implement Clone, Copy, Debug, PartialEq for square

src/main.rs

@@ -3,6 +3,7 @@ trait ConvertToString {
     fn to_string(&self) -> String;
 }
 
+#[derive(Clone, Copy, Debug, PartialEq)]
 enum Square {
     Empty,
     Cross,
@@ -27,17 +28,7 @@ impl Board {
     /// Creates a new empty board
     fn new() -> Self {
         Self {
-            board: [
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-                Square::Empty,
-            ],
+            board: [Square::Empty; 9],
         }
     }
 
@@ -51,12 +42,15 @@ impl ConvertToString for Board {
     fn to_string(&self) -> String {
         let mut out = String::new();
         for row in 0..3 {
-            out.push_str(format!(
-                " {} | {} | {}",
-                self.board[row * 3].to_string(),
-                self.board[row * 3 + 1].to_string(),
-                self.board[row * 3 + 2].to_string()
-            ).as_str());
+            out.push_str(
+                format!(
+                    " {} | {} | {}",
+                    self.board[row * 3].to_string(),
+                    self.board[row * 3 + 1].to_string(),
+                    self.board[row * 3 + 2].to_string()
+                )
+                .as_str(),
+            );
             if row == 0 || row == 1 {
                 out.push_str("\n---+---+---\n");
             }
@@ -92,13 +86,7 @@ mod tests {
         let board = Board::new();
 
         for square in board.board {
-            // Cannot do that due to 'trait' issues, more on that
-            // later
-            //            assert_eq!(square, Square::Empty);
-            match square {
-                Square::Empty => (),
-                Square::Cross | Square::Circle => panic!("Square is not empty"),
-            }
+            assert_eq!(square, Square::Empty);
         }
     }
 
@@ -111,7 +99,7 @@ mod tests {
  . | . | .";
         assert_eq!(expected, Board::new().to_string());
     }
-    
+
     #[test]
     fn empty_square_to_string_dot() {
         assert_eq!(".", Square::Empty.to_string());