diff --git a/tests/test_superwow_fov_sync.py b/tests/test_superwow_fov_sync.py
new file mode 100644
index 0000000..3c6a6eb
--- /dev/null
+++ b/tests/test_superwow_fov_sync.py
@@ -0,0 +1,105 @@
+import os
+import stat
+import tempfile
+import unittest
+
+import setup_tool_dynamic as dynamic
+
+
+class FakeVar:
+    def __init__(self, value):
+        self.value = value
+
+    def get(self):
+        return self.value
+
+
+class SuperWowFovSyncTests(unittest.TestCase):
+    def _tool(self, *, superwow=True, fov=1.9199, script_memory=False):
+        tool = object.__new__(dynamic.ModernWowSetupTool)
+        tool.core_plugins = {
+            "SuperWoWhook.dll": FakeVar(superwow),
+        }
+        tool.vt_fov = FakeVar(fov)
+        tool.vt_script_memory = FakeVar(script_memory)
+        return tool
+
+    @staticmethod
+    def _config_path(root):
+        return os.path.join(root, "WTF", "Config.wtf")
+
+    def test_superwow_enabled_updates_existing_fov(self):
+        with tempfile.TemporaryDirectory() as root:
+            path = self._config_path(root)
+            os.makedirs(os.path.dirname(path))
+            with open(path, "w", encoding="utf-8") as handle:
+                handle.write(
+                    'SET gxWindow "1"\n'
+                    'SET FoV "1.5"\n'
+                    'SET locale "enUS"\n'
+                )
+
+            self._tool().configure_script_memory(root)
+
+            with open(path, "r", encoding="utf-8") as handle:
+                result = handle.read()
+            self.assertIn('SET FoV "1.9199"', result)
+            self.assertIn('SET gxWindow "1"', result)
+            self.assertIn('SET locale "enUS"', result)
+            self.assertNotIn('SET FoV "1.5"', result)
+
+    def test_superwow_enabled_creates_missing_fov_setting(self):
+        with tempfile.TemporaryDirectory() as root:
+            path = self._config_path(root)
+
+            self._tool(fov=2.1).configure_script_memory(root)
+
+            with open(path, "r", encoding="utf-8") as handle:
+                result = handle.read()
+            self.assertEqual(result, 'SET FoV "2.1"\n')
+
+    def test_superwow_disabled_leaves_existing_fov_untouched(self):
+        with tempfile.TemporaryDirectory() as root:
+            path = self._config_path(root)
+            os.makedirs(os.path.dirname(path))
+            original = 'SET FoV "1.5"\nSET locale "frFR"\n'
+            with open(path, "w", encoding="utf-8") as handle:
+                handle.write(original)
+
+            self._tool(superwow=False).configure_script_memory(root)
+
+            with open(path, "r", encoding="utf-8") as handle:
+                self.assertEqual(handle.read(), original)
+
+    def test_script_memory_and_superwow_fov_are_both_applied(self):
+        with tempfile.TemporaryDirectory() as root:
+            path = self._config_path(root)
+            os.makedirs(os.path.dirname(path))
+            with open(path, "w", encoding="utf-8") as handle:
+                handle.write('SET locale "enUS"\n')
+
+            self._tool(script_memory=True).configure_script_memory(root)
+
+            with open(path, "r", encoding="utf-8") as handle:
+                result = handle.read()
+            self.assertIn('SET scriptMemory "0"', result)
+            self.assertIn('SET FoV "1.9199"', result)
+
+    def test_readonly_config_mode_is_restored(self):
+        with tempfile.TemporaryDirectory() as root:
+            path = self._config_path(root)
+            os.makedirs(os.path.dirname(path))
+            with open(path, "w", encoding="utf-8") as handle:
+                handle.write('SET FoV "1.5"\n')
+            os.chmod(path, stat.S_IREAD)
+
+            self._tool().configure_script_memory(root)
+
+            mode = os.stat(path).st_mode
+            self.assertFalse(mode & stat.S_IWRITE)
+            with open(path, "r", encoding="utf-8") as handle:
+                self.assertIn('SET FoV "1.9199"', handle.read())
+
+
+if __name__ == "__main__":
+    unittest.main()