Don't remove add-on repos if add-on is installed (#3364)

tests/fixtures/add-on.json

@@ -1,10 +1,13 @@
 {
   "advanced": false,
-  "arch": ["amd64"],
+  "arch": [
+    "amd64"
+  ],
+  "slug": "test",
   "description": "Test add-on",
   "location": "tmp_path",
   "name": "Test Add-on",
-  "repository": "https://github.com/awesome-developer/awesome-repo",
+  "repository": "a474bbd1",
   "stage": "stable",
   "version": "1.0.0"
 }

tests/store/test_custom_repository.py

@@ -4,6 +4,8 @@ from unittest.mock import patch
 
 import pytest
 
+from supervisor.addons.addon import Addon
+from supervisor.exceptions import StoreError
 from supervisor.resolution.const import SuggestionType
 from supervisor.store import BUILTIN_REPOSITORIES
 
@@ -72,3 +74,17 @@ async def test_preinstall_valid_repository(coresys, store_manager):
         await store_manager.update_repositories(BUILTIN_REPOSITORIES)
         assert store_manager.get("core").validate()
         assert store_manager.get("local").validate()
+
+
+@pytest.mark.asyncio
+async def test_remove_used_repository(coresys, store_manager, store_addon):
+    """Test removing used custom repository."""
+    coresys.addons.data.install(store_addon)
+    addon = Addon(coresys, store_addon.slug)
+    coresys.addons.local[addon.slug] = addon
+
+    with pytest.raises(
+        StoreError,
+        match="Can't remove 'https://github.com/awesome-developer/awesome-repo'. It's used by installed add-ons",
+    ):
+        await store_manager.update_repositories([])