[GEMINI] Refactor test suite structure for new helpers and config modules

tests/test_decoding.py

@@ -133,20 +133,5 @@ def test_try_decode_metadata_rot13_unique_only():
     assert "rot13" not in res_duplicate
 # }}}
 
-# {{{ test_check_for_flag
-def test_check_for_flag():
-    """
-    Verifies that check_for_flag extracts multiple matching flags or returns empty list.
-    """
-    from ctf.decoding import check_for_flag
-    # Default fallback - matches multiple
-    res = check_for_flag("flag{one} and flag{two}")
-    assert set(res) == {"flag{one}", "flag{two}"}
-    # Custom format
-    res_custom = check_for_flag("custom{first} custom{second}", r"custom\{[a-z]+\}")
-    assert set(res_custom) == {"custom{first}", "custom{second}"}
-    # No matches
-    assert check_for_flag("no flag matches here") == []
-# }}}