GH-5: Test backend initialization with all available implementations

Author: ArtyomVancyan

tests/test_oauth2_middleware.py

@@ -1,14 +1,55 @@
+import importlib
+import os
+
 import pytest
+import social_core.backends as backends
+from fastapi import APIRouter
 from fastapi import FastAPI
 from httpx import AsyncClient
 from social_core.backends.github import GithubOAuth2
+from social_core.backends.oauth import BaseOAuth2
+from starlette.requests import Request
 
 from fastapi_oauth2.client import OAuth2Client
+from fastapi_oauth2.config import OAuth2Config
+from fastapi_oauth2.middleware import OAuth2Backend
 from fastapi_oauth2.middleware import OAuth2Middleware
 from fastapi_oauth2.router import router as oauth2_router
 
 app = FastAPI()
+router = APIRouter()
+
+
+@router.get("/test_backends")
+async def _backends(request: Request):
+    responses = []
+    for module in os.listdir(backends.__path__[0]):
+        try:
+            module_instance = importlib.import_module("social_core.backends.%s" % module[:-3])
+            backend_implementations = [
+                attr for attr in module_instance.__dict__.values()
+                if type(attr) is type and all([
+                    issubclass(attr, BaseOAuth2),
+                    attr is not BaseOAuth2,
+                ])
+            ]
+            for backend_cls in backend_implementations:
+                backend = OAuth2Backend(OAuth2Config(
+                    clients=[
+                        OAuth2Client(
+                            backend=backend_cls,
+                            client_id="test_client_id",
+                            client_secret="test_client_secret",
+                        )
+                    ]
+                ))
+                responses.append(await backend.authenticate(request))
+        except ImportError:
+            continue
+    return responses
+
 
+app.include_router(router)
 app.include_router(oauth2_router)
 app.add_middleware(OAuth2Middleware, config={
     "allow_http": True,
@@ -27,3 +68,9 @@ async def test_auth_redirect():
     async with AsyncClient(app=app, base_url="http://test") as client:
         response = await client.get("/oauth2/github/auth")
         assert response.status_code == 303  # Redirect
+
+
+@pytest.mark.anyio
+async def test_backends():
+    async with AsyncClient(app=app, base_url="http://test") as client:
+        assert all((await client.get("/test_backends")).json())