Problem testing HA custom component with uses oauth2

[jwillemsen]

I am trying to setup tests for a custom component which uses oauth2 authorization. When researching how to test a custom component I found this project and I found some oauth2 scaffolding scripts which are part of HA.

The HA scaffolding generated test code for oauth2 works for a core component, but when trying this as part of a custom component it fails with the error below. I have added a conftest.py but that didn't resolve. As it works within the core HA test directory I think this project does something which breaks it.

In order to analyze this I have isolated everything in a small test repo, see https://github.com/jwillemsen/haoauth2_test.

hass = <homeassistant.core.HomeAssistant object at 0x7f4b2e933280>

    @pytest.fixture
    async def setup_credentials(hass: HomeAssistant) -> None:
        """Fixture to setup credentials."""
        assert await async_setup_component(hass, "application_credentials", {})
>       await async_import_client_credential(
            hass,
            DOMAIN,
            ClientCredential(CLIENT_ID, CLIENT_SECRET),
        )

tests/test_config_flow.py:29: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/usr/lib/python3.10/site-packages/homeassistant/components/application_credentials/__init__.py:185: in async_import_client_credential
    await storage_collection.async_import_item(item)
/usr/lib/python3.10/site-packages/homeassistant/components/application_credentials/__init__.py:125: in async_import_item
    await self.async_create_item(info)
/usr/lib/python3.10/site-packages/homeassistant/helpers/collection.py:310: in async_create_item
    validated_data = await self._process_create_data(data)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <homeassistant.components.application_credentials.ApplicationCredentialsStorageCollection object at 0x7f4b2e94eaa0>, data = {'auth_domain': 'daikin_onecta', 'client_id': '1234', 'client_secret': '5678', 'domain': 'daikin_onecta', ...}

    async def _process_create_data(self, data: dict[str, str]) -> dict[str, str]:
        """Validate the config is valid."""
        result = self.CREATE_SCHEMA(data)
        domain = result[CONF_DOMAIN]
        if not await _get_platform(self.hass, domain):
>           raise ValueError(f"No application_credentials platform for {domain}")
E           ValueError: No application_credentials platform for daikin_onecta