migration: prove standalone maintenance and correct visual evidence

tests/preservation_helpers.py

@@ -26,6 +26,7 @@ RETIRED_FRONTEND_SOURCE_RANGES = (
     (9022, 9027),
     (9052, 9055),
 )
+AUDITED_FRONTEND_SOURCE_LINE_COUNT = 9283
 
 
 def sha256(path: Path) -> str:
@@ -51,12 +52,10 @@ def reassembled_frontend_runtime() -> str:
         assembled.append(content)
         next_line = end + 1
 
-    original_line_count = len(
-        (ORIGINAL_STATIC / "app.js").read_text(encoding="utf-8").splitlines()
-    )
-    if next_line != original_line_count + 1:
+    if next_line != AUDITED_FRONTEND_SOURCE_LINE_COUNT + 1:
         raise AssertionError(
-            f"app.js source coverage ended at {next_line - 1}, expected {original_line_count}"
+            "app.js source coverage ended at "
+            f"{next_line - 1}, expected {AUDITED_FRONTEND_SOURCE_LINE_COUNT}"
         )
     return "".join(assembled)
 

tests/test_frontend_boundaries.py

@@ -4,6 +4,7 @@ import json
 import re
 import unittest
 from pathlib import Path
+from unittest.mock import patch
 
 from tests.preservation_helpers import reassembled_frontend_runtime
 
@@ -46,6 +47,14 @@ class FrontendBoundaryTests(unittest.TestCase):
         self.assertIn("const state = window.XiaobaiState.create({", app)
         self.assertNotIn("const state = {", app)
 
+    def test_candidate_runtime_reassembly_does_not_require_original_static(self) -> None:
+        with patch(
+            "tests.preservation_helpers.ORIGINAL_STATIC",
+            ROOT / "missing-original-static",
+        ):
+            app = reassembled_frontend_runtime()
+        self.assertIn("function openView(", app)
+
     def test_runtime_page_registry_matches_governance_registry(self) -> None:
         expected = json.loads(
             (ROOT / "config" / "pages.config.json").read_text(encoding="utf-8")

tests/test_maintenance_tools.py

@@ -3,11 +3,16 @@ from __future__ import annotations
 import json
 import subprocess
 import sys
+import tempfile
 import unittest
 from pathlib import Path
 
 from tools.build_api_registry import build as build_api_registry
-from tools.build_architecture_inventory import build as build_architecture_inventory
+from tools.build_architecture_inventory import (
+    build as build_architecture_inventory,
+    source_metrics,
+)
+from tools.verify_baseline import python_test_command
 
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -34,6 +39,22 @@ class MaintenanceToolTests(unittest.TestCase):
         self.assertIn("stop_e2e_server(server)", source)
         self.assertNotIn('"static/app.js"', source)
 
+    def test_standalone_verifier_excludes_only_migration_comparison_modules(self) -> None:
+        repository_command = python_test_command(preservation_baseline=True)
+        standalone_command = python_test_command(preservation_baseline=False)
+        self.assertIn("discover", repository_command)
+        self.assertTrue(any(item == "tests.test_frontend_contract" for item in standalone_command))
+        self.assertFalse(any("test_preservation_" in item for item in standalone_command))
+
+    def test_architecture_metrics_are_independent_of_checkout_line_endings(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            lf = root / "lf.js"
+            crlf = root / "crlf.js"
+            lf.write_bytes(b"const a = 1;\nconst b = 2;\n")
+            crlf.write_bytes(b"const a = 1;\r\nconst b = 2;\r\n")
+            self.assertEqual(source_metrics(lf), source_metrics(crlf))
+
     def test_every_tool_has_a_non_mutating_help_path(self) -> None:
         for path in sorted((ROOT / "tools").glob("*.py")):
             if path.name.startswith("_"):