Test: Wrong character test

src/main.rs

@@ -135,7 +135,16 @@ mod tests {
     #[should_panic(expected = "Input must have dimension of size 2x2")]
     fn test_parse_field_too_short_input() {
         let input = "1 2 3";
-        let field_size = 2;
+        let field_size = 3;
+
+        let _ = parse_playfield(&input.to_string(), field_size);
+    }
+
+    #[test]
+    #[should_panic(expected = "Input must contain only digits followed by space")]
+    fn test_parse_field_wrong_character() {
+        let input = "1 2 3 0 0 0 3 2 a";
+        let field_size = 3;
 
         let _ = parse_playfield(&input.to_string(), field_size);
     }