diff --git a/tests/test_vanilla_tweaks_normalization.py b/tests/test_vanilla_tweaks_normalization.py
new file mode 100644
index 0000000..0b4d60a
--- /dev/null
+++ b/tests/test_vanilla_tweaks_normalization.py
@@ -0,0 +1,155 @@
+import os
+import struct
+import tempfile
+import unittest
+
+from setup_tool import WowSetupTool
+from setup_tool_dynamic import ModernWowSetupTool
+
+
+class FakeVar:
+    def __init__(self, value):
+        self.value = value
+
+    def get(self):
+        return self.value
+
+    def set(self, value):
+        self.value = value
+
+
+class VanillaTweaksNormalizationTests(unittest.TestCase):
+    def _tool(self, *, fov, sound, quickloot, background):
+        tool = ModernWowSetupTool.__new__(ModernWowSetupTool)
+        tool.vt_fov = FakeVar(fov)
+        tool.vt_soundchan = FakeVar(sound)
+        tool.vt_quickloot = FakeVar(quickloot)
+        tool.vt_bg_sound = FakeVar(background)
+
+        # Remaining values are required by the executable settings signature.
+        tool.vt_farclip = FakeVar(777)
+        tool.vt_frill = FakeVar(300)
+        tool.vt_nameplate = FakeVar(41)
+        tool.vt_maxcam = FakeVar(100)
+        tool.vt_laa = FakeVar(True)
+        tool.vt_cam_fix = FakeVar(True)
+        tool.vt_crossfaction_res = FakeVar(False)
+        tool.vt_custom_glues = FakeVar(True)
+        tool.vt_bluemoon = FakeVar(False)
+        tool.core_plugins = {"SuperWoWhook.dll": FakeVar(True)}
+        return tool
+
+    def _write_exe(self, root, quick1, quick2, background, fov, sound):
+        data = bytearray(0x435D3C + 16)
+        data[0x0C1ECF:0x0C1ED1] = quick1
+        data[0x0C2B25:0x0C2B27] = quick2
+        data[0x3A4869] = background
+        data[0x4089B4:0x4089B8] = struct.pack("<f", fov)
+        data[0x435D38:0x435D3C] = sound
+        path = os.path.join(root, "WoW_Modernized.exe")
+        with open(path, "wb") as handle:
+            handle.write(data)
+        return path
+
+    def test_disabled_selections_restore_inherited_patches(self):
+        tool = self._tool(
+            fov=1.5708,
+            sound=12,
+            quickloot=False,
+            background=False,
+        )
+
+        with tempfile.TemporaryDirectory() as root:
+            path = self._write_exe(
+                root,
+                b"\x75\x10",
+                b"\x75\x0B",
+                0x27,
+                1.919862,
+                b"64\x00\x00",
+            )
+            tool._normalize_selected_vanilla_tweaks_output(path)
+            with open(path, "rb") as handle:
+                result = handle.read()
+
+        self.assertEqual(result[0x0C1ECF:0x0C1ED1], b"\x74\x10")
+        self.assertEqual(result[0x0C2B25:0x0C2B27], b"\x74\x0B")
+        self.assertEqual(result[0x3A4869], 0x14)
+        self.assertAlmostEqual(
+            struct.unpack("<f", result[0x4089B4:0x4089B8])[0],
+            1.5708,
+            places=4,
+        )
+        self.assertEqual(result[0x435D38:0x435D3C], b"12\x00\x00")
+
+    def test_enabled_selections_override_vanilla_or_nop_input(self):
+        tool = self._tool(
+            fov=1.9199,
+            sound=64,
+            quickloot=True,
+            background=True,
+        )
+
+        with tempfile.TemporaryDirectory() as root:
+            path = self._write_exe(
+                root,
+                b"\x90\x90",
+                b"\x90\x90",
+                0x14,
+                1.5708,
+                b"12\x00\x00",
+            )
+            tool._normalize_selected_vanilla_tweaks_output(path)
+            with open(path, "rb") as handle:
+                result = handle.read()
+
+        self.assertEqual(result[0x0C1ECF:0x0C1ED1], b"\x75\x10")
+        self.assertEqual(result[0x0C2B25:0x0C2B27], b"\x75\x0B")
+        self.assertEqual(result[0x3A4869], 0x27)
+        self.assertAlmostEqual(
+            struct.unpack("<f", result[0x4089B4:0x4089B8])[0],
+            1.9199,
+            places=4,
+        )
+        self.assertEqual(result[0x435D38:0x435D3C], b"64\x00\x00")
+
+    def test_unknown_quickloot_bytes_fail_safe(self):
+        tool = self._tool(
+            fov=1.9199,
+            sound=64,
+            quickloot=True,
+            background=True,
+        )
+
+        with tempfile.TemporaryDirectory() as root:
+            path = self._write_exe(
+                root,
+                b"\xEB\x10",
+                b"\x74\x0B",
+                0x14,
+                1.5708,
+                b"12\x00\x00",
+            )
+            with self.assertRaisesRegex(RuntimeError, "Unexpected QuickLoot bytes"):
+                tool._normalize_selected_vanilla_tweaks_output(path)
+
+    def test_normalization_policy_forces_one_marker_refresh(self):
+        tool = self._tool(
+            fov=1.9199,
+            sound=64,
+            quickloot=True,
+            background=True,
+        )
+
+        old_signature = WowSetupTool._vanilla_tweaks_signature(tool)
+        new_signature = tool._vanilla_tweaks_signature()
+
+        self.assertNotIn("selected_patch_normalization", old_signature)
+        self.assertEqual(new_signature["selected_patch_normalization"], 1)
+
+        tool.core_plugins["SuperWoWhook.dll"].set(False)
+        self.assertEqual(new_signature, tool._vanilla_tweaks_signature())
+
+
+if __name__ == "__main__":
+    unittest.main()