Test for overflow

src/map.rs

@@ -335,4 +335,18 @@ mod tests {
 
         assert_eq!(map.tiles, expected_map.tiles);
     }
+
+
+    #[test]
+    fn test_available_exists() {
+        let map_str = "
+         #########
+        #    #   #
+        ##########
+        ";
+        let map = Map::from_string(map_str);
+        let exists = map.get_available_exits(0, 0);
+
+        assert_eq!(exists.len(), 0);
+    }
 }