fix: a declared alias settles the entry

scripts/verify.py

@@ -399,8 +399,11 @@ def _candidate_verdict(
     if outside_gap_scope(file_entry, is_standalone):
         return "skip"
     if not include_all:
-        archive = file_entry.get("archive")
+        # A platform declaring any name the core answers to has met the
-        if fname in declared_names or (archive and archive in declared_names):
+        # requirement: quasi88 reads n88sub.rom or disk.rom, and System.dat
+        # names disk.rom. Without the aliases the pack carried the ROM twice.
+        answers = {fname, file_entry.get("archive") or "", *file_entry.get("aliases", [])}
+        if answers & declared_names:
             return "settled"
     return "keep"
 

tests/test_shared_groups.py

@@ -61,5 +61,36 @@ class SharedGroupsAddOnly(unittest.TestCase):
                             repeated.append(f"{platform}:{fe['name']} = {other}")
         self.assertEqual(repeated, [])
 
+class ADeclaredAliasSettlesTheRequirement(unittest.TestCase):
+    """quasi88 reads n88sub.rom or disk.rom; System.dat names disk.rom. The
+    gap pass compared the entry's name alone and the pack carried the same
+    2 KB ROM a second time as quasi88/n88sub.rom."""
+
+    def test_a_platform_naming_an_alias_has_met_the_entry(self):
+        import os  # noqa: PLC0415
+        import tempfile  # noqa: PLC0415
+
+        from common import _emulator_profiles_cache  # noqa: PLC0415
+        from verify import find_undeclared_files  # noqa: PLC0415
+
+        with tempfile.TemporaryDirectory() as tmp:
+            Path(tmp, "emulators").mkdir()
+            Path(tmp, "emulators", "quasi88.yml").write_text(
+                "emulator: QUASI88\ntype: libretro\nsystems: [nec-pc-88]\ncores: [quasi88]\n"
+                "files:\n  - name: n88sub.rom\n    aliases: [N88SUB.ROM, disk.rom]\n"
+                "    required: true\n"
+            )
+            _emulator_profiles_cache.clear()
+            self.addCleanup(_emulator_profiles_cache.clear)
+            config = {"platform": "P", "verification_mode": "existence", "cores": "all_libretro",
+                      "systems": {"nec-pc-88": {"files": [{"name": "disk.rom", "destination": "quasi88/disk.rom"}]}}}
+            db = {"files": {}, "indexes": {"by_name": {}, "by_md5": {}, "by_crc32": {}, "by_path_suffix": {}}}
+            previous = os.getcwd()
+            os.chdir(tmp)
+            self.addCleanup(os.chdir, previous)
+            undeclared = find_undeclared_files(config, "emulators", db, data_names=set())
+        self.assertEqual([u["name"] for u in undeclared], [])
+
+
 if __name__ == "__main__":
     unittest.main()