fix: align three region tags with their code

emulators/clk.yml

@@ -708,7 +708,7 @@ files:
     path: MasterSystem/bios.sms
     system: sega-mastersystem
     description: "European/US Master System BIOS"
-    region: [north-america, europe, brazil]
+    region: [north-america, europe, oceania, brazil]
     size: 8192
     crc32: "0072ed54"
     required: false

emulators/kronos.yml

@@ -158,8 +158,9 @@ files:
   - name: "epr-17954a.ic8"
     archive: stvbios.zip
     system: sega-stv
+    region: [europe]
     required: false
-    note: "Picked by the kronos_stv_favorite_region option, Europe by default, among the BIOS regions the set accepts (yabause/src/ctrl/src/stv.c:2435, 2562-2564)."
+    note: "Loaded only when the set allows STV_REGION_EU; among allowed regions the kronos_stv_favorite_region option, Europe by default, picks (yabause/src/ctrl/src/stv.c:2435, 2562-2564)."
     size: 524288
     crc32: "f7722da3"
     validation: [crc32]

emulators/mednafen_stv.yml

@@ -97,7 +97,7 @@ files:
     source_ref: "libretro/libretro.cpp:640, mednafen/ss/ss.cpp:1449-1450, 1507, 1520-1521"
   - name: "mpr-17933.bin"
     system: "sega-saturn"
-    region: [north-america, latin-america, brazil, south-korea, asia-pal, europe]
+    region: [north-america, latin-america, brazil, south-korea, asia-pal, europe, oceania]
     required: true
     size: 524288
     sha256: "96e106f740ab448cf89f0dd49dfbac7fe5391cb6bd6e14ad5e3061c13330266f"

emulators/saturn-emu.yml

@@ -131,7 +131,7 @@ files:
     system: sega-saturn
     description: "Saturn BIOS read for every area outside Japan and Asia NTSC"
     required: true
-    region: [north-america, europe, south-korea, asia-pal, brazil, latin-america]
+    region: [north-america, europe, oceania, south-korea, asia-pal, brazil, latin-america]
     size: 524288
     sha256: "96e106f740ab448cf89f0dd49dfbac7fe5391cb6bd6e14ad5e3061c13330266f"
     validation: [existence, size, sha256]
@@ -175,7 +175,7 @@ files:
     system: sega-saturn
     description: "Saturn BIOS v1.00a, accepted for every area outside Japan and Asia NTSC"
     required: false
-    region: [north-america, europe, south-korea, asia-pal, brazil, latin-america]
+    region: [north-america, europe, oceania, south-korea, asia-pal, brazil, latin-america]
     size: 524288
     sha256: "87293093fad802fcff31fcab427a16caff1acbc5184899b8383b360fd58efb73"
     validation: [existence, size, sha256]

tests/test_region.py

@@ -428,6 +428,38 @@ class TestFallbackGroups(unittest.TestCase):
         self.assertEqual(region.fallback_groups(groups, self.index, []), [])
 
 
+class OneCodeOneRegionAnswer(unittest.TestCase):
+    """mednafen, beetle_saturn, saturn-emu and mednafen_stv read the same
+    ss.cpp, where area E (Australia included) selects the PAL BIOS: only
+    two of them answered oceania. CLK and Kronos are pinned here too."""
+
+    PROFILES = os.path.join(os.path.dirname(__file__), "..", "emulators")
+
+    def test_the_mednafen_saturn_profiles_agree(self):
+        profiles = common.load_emulator_profiles(self.PROFILES)
+        seen: dict[str, dict[str, frozenset]] = {}
+        for name in ("mednafen", "beetle_saturn", "saturn-emu", "mednafen_stv"):
+            for entry in profiles[name]["files"]:
+                if entry["name"] in ("mpr-17933.bin", "sega_100a.bin"):
+                    seen.setdefault(entry["name"], {})[name] = frozenset(
+                        entry.get("region") or ()
+                    )
+        for file_name, tags in seen.items():
+            with self.subTest(file=file_name):
+                self.assertEqual(len(set(tags.values())), 1, tags)
+                self.assertIn("oceania", next(iter(tags.values())))
+
+    def test_export_cartridges_and_allowed_regions(self):
+        profiles = common.load_emulator_profiles(self.PROFILES)
+        bios_sms = next(e for e in profiles["clk"]["files"] if e["name"] == "bios.sms")
+        self.assertIn("oceania", bios_sms["region"])
+        tagged = {
+            e["name"]: e.get("region") for e in profiles["kronos"]["files"]
+            if e.get("archive") == "stvbios.zip" and e["name"].startswith("epr-")
+        }
+        self.assertTrue(all(tagged.values()), tagged)
+
+
 class AustraliaReadsThePalIpl(unittest.TestCase):
     """Dolphin files the Australian country code U under Region::PAL
     (Source/Core/DiscIO/Enums.cpp), whose IPL is GC/EUR. Tagged [europe]