feat: add verification for path *.out

joj3_config_generator/transformers/task.py

@@ -1,3 +1,4 @@
+import os
 import re
 import shlex
 from functools import partial
@@ -259,4 +260,7 @@ def get_testcases(
                 testcases_path.relative_to((task_root / task_path).parent)
             ).removesuffix(".in")
         )
+        assert os.path.exists(
+            str(testcases_path).removesuffix(".in") + ".out"
+        ), f"{testcases_path} does not have a corresponding *.out file!"
     return testcases