test: keep validation index on platform cores

tests/test_validation_scope.py

@@ -0,0 +1,43 @@
+"""The validation index only hears from the emulators the platform runs.
+
+Built over every profile, ZEsarUX (standalone, a 48K cpc6128.rom) and ePSXe
+judged RetroArch packs and the gaps page listed five hash mismatches with no
+object. verify and the builder pass resolve_platform_cores' selection; this
+test fails if either hands the index the whole profile set again.
+"""
+
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+
+
+class ValidationIndexScope(unittest.TestCase):
+    def test_no_index_over_every_profile(self):
+        pattern = re.compile(r"_build_validation_index\(\s*(emu_)?profiles\s*\)")
+        for name in ("verify.py", "generate_pack.py", "packverify.py", "packextras.py"):
+            source = (REPO_ROOT / "scripts" / name).read_text(encoding="utf-8")
+            with self.subTest(module=name):
+                self.assertIsNone(pattern.search(source))
+
+    def test_platform_paths_select_by_platform_cores(self):
+        verify = (REPO_ROOT / "scripts" / "verify.py").read_text(encoding="utf-8")
+        builder = (REPO_ROOT / "scripts" / "generate_pack.py").read_text(encoding="utf-8")
+        self.assertRegex(
+            verify,
+            r"plat_cores = resolve_platform_cores\(config, profiles\)\s+"
+            r"validation_index = _build_validation_index\(\s*"
+            r"\{name: profiles\[name\] for name in plat_cores\}",
+        )
+        self.assertRegex(
+            builder,
+            r"for name in resolve_platform_cores\(config, emu_profiles\)\s*\}\s*"
+            r"validation_index = _build_validation_index\(platform_profiles\)",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()