Add stubtest

Author: huynguyengl99

stubs/channels/@tests/django_settings.py

@@ -0,0 +1,12 @@
+SECRET_KEY = "1"
+
+INSTALLED_APPS = (
+    "django.contrib.contenttypes",
+    "django.contrib.sites",
+    "django.contrib.sessions",
+    "django.contrib.messages",
+    "django.contrib.admin.apps.SimpleAdminConfig",
+    "django.contrib.staticfiles",
+    "django.contrib.auth",
+    "channels",
+)

stubs/channels/@tests/stubtest_allowlist.txt

@@ -0,0 +1,3 @@
+channels.auth.UserLazyObject
+channels.auth.UserLazyObject.*
+channels.db.database_sync_to_async

stubs/channels/METADATA.toml

@@ -3,5 +3,6 @@ upstream_repository = "https://github.com/django/channels"
 requires = ["django-stubs>=4.2,<5.3", "asgiref"]
 
 [tool.stubtest]
-skip = true  # TODO: enable stubtest once Django mypy plugin config is supported
+mypy_plugins = ['mypy_django_plugin.main']
+mypy_plugins_config = {"django-stubs" = {"django_settings_module" = "@tests.django_settings"}}
 stubtest_requirements = ["daphne"]