Add pattern parser regression test

tests/test_verification.py

@@ -1,11 +1,19 @@
 from __future__ import annotations
 
 import subprocess
+import sys
 import unittest
+from pathlib import Path
 from unittest.mock import patch
 
 from space_app.verification import VerificationService
 
+RLP_PATH = Path(__file__).resolve().parents[1] / "submodules" / "rlp"
+if str(RLP_PATH) not in sys.path:
+    sys.path.insert(0, str(RLP_PATH))
+
+from rlp.ascii_parser import parse_ascii_pattern  # type: ignore
+
 
 class VerificationTests(unittest.TestCase):
     def test_flow_free_example_if_solver_available(self) -> None:
@@ -44,6 +52,28 @@ class VerificationTests(unittest.TestCase):
                 problem_ascii=board,
                 board_ascii=board,
                 args="4x4de",
-            )
+        )
         self.assertFalse(result["correct"])
         self.assertEqual(result.get("error"), "Undead verification timed out.")
+
+    def test_pattern_parser_keeps_single_digit_top_clue_rows(self) -> None:
+        board = "\n".join(
+            [
+                "              1    ",
+                "     1  2  3  3  3 ",
+                "   +--+--+--+--+--+",
+                "2 1|##|##|..|##|..|",
+                "   +--+--+--+--+--+",
+                "  1|..|##|..|..|..|",
+                "   +--+--+--+--+--+",
+                "  3|..|..|##|##|##|",
+                "   +--+--+--+--+--+",
+                "  3|..|..|##|##|##|",
+                "   +--+--+--+--+--+",
+                "  3|..|..|##|##|##|",
+                "   +--+--+--+--+--+",
+            ]
+        )
+        state = parse_ascii_pattern(board)
+        self.assertEqual(state["common"]["rowlen"][:5], [1, 1, 1, 2, 1])
+        self.assertEqual(state["common"]["rowdata"][:6], [1, 2, 3, 1, 3, 3])