Add tests

src/main.rs

@@ -55,3 +55,36 @@ fn main() {
 
     board.display();
 }
+
+// Will only be build in 'test' configuration
+#[cfg(test)]
+// A module where the tests are located, more on modules later
+mod tests {
+    use super::*;
+    
+    #[test]
+    fn should_pass() {
+        assert!(true);
+    }
+    #[test]
+    #[should_panic]
+    fn should_panic() {
+        panic!("Doing wrong things on purpose here!");
+    }
+
+    #[test]
+    fn new_board_squares_are_empty() {
+        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"),
+            }
+        }
+    }
+}