test: add more test

Author: wislertt

leetcode/spiral_matrix/tests.py

@@ -23,6 +23,8 @@ def setup_method(self):
             ([[1, 2, 3, 4, 5]], [1, 2, 3, 4, 5]),
             ([[1], [2], [3], [4], [5]], [1, 2, 3, 4, 5]),
             ([[1, 2, 3, 4], [5, 6, 7, 8]], [1, 2, 3, 4, 8, 7, 6, 5]),
+            ([], []),
+            ([[]], []),
         ],
     )
     @logged_test