diff --git a/fusion_accounting_assets/tests/__init__.py b/fusion_accounting_assets/tests/__init__.py
index 4afe5c8c..b5d2c45e 100644
--- a/fusion_accounting_assets/tests/__init__.py
+++ b/fusion_accounting_assets/tests/__init__.py
@@ -25,3 +25,4 @@ from . import test_partial_sale_wizard
 from . import test_depreciation_run_wizard
 from . import test_migration_round_trip
 from . import test_audit_report
+from . import test_coexistence
diff --git a/fusion_accounting_assets/tests/test_coexistence.py b/fusion_accounting_assets/tests/test_coexistence.py
new file mode 100644
index 00000000..56c77d6b
--- /dev/null
+++ b/fusion_accounting_assets/tests/test_coexistence.py
@@ -0,0 +1,38 @@
+"""Coexistence tests: fusion_accounting_assets menu only visible when
+Enterprise account_asset is NOT installed."""
+
+from odoo.tests.common import TransactionCase
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestAssetsCoexistence(TransactionCase):
+
+    def setUp(self):
+        super().setUp()
+        self.coex_group = self.env.ref(
+            'fusion_accounting_core.group_fusion_show_when_enterprise_absent',
+            raise_if_not_found=False,
+        )
+        self.assertIsNotNone(self.coex_group, "Coexistence group must exist")
+
+    def test_engine_always_available(self):
+        """Engine is registered regardless of Enterprise install state."""
+        self.assertIn('fusion.asset.engine', self.env.registry)
+
+    def test_menu_gated_by_coexistence_group(self):
+        menu = self.env.ref('fusion_accounting_assets.menu_fusion_assets_root',
+                             raise_if_not_found=False)
+        if not menu:
+            self.skipTest("Menu not loaded")
+        menu_groups = getattr(menu, 'group_ids', None) or menu.groups_id
+        self.assertIn(self.coex_group, menu_groups,
+            "Asset root menu must require the coexistence group")
+
+    def test_categories_menu_gated(self):
+        menu = self.env.ref('fusion_accounting_assets.menu_fusion_asset_categories',
+                             raise_if_not_found=False)
+        if not menu:
+            self.skipTest("Menu not loaded")
+        menu_groups = getattr(menu, 'group_ids', None) or menu.groups_id
+        self.assertIn(self.coex_group, menu_groups)