Test: Too long input

src/main.rs

@@ -113,4 +113,13 @@ mod tests {
             }
         )
     }
+
+    #[test]
+    #[should_panic(expected = "Input must have dimension of size 2x2)")]
+    fn test_parse_field_too_long_input() {
+        let input = "1 2 3 0 0 0 3 2 1";
+        let field_size = 2;
+
+        let _ = parse_playfield(&input.to_string(), field_size);
+    }
 }